Check out my sponsor LetsGetChecked trylgc.com/donslife Use Code DONSLIFE for 25% off your home test kit linktr.ee/donslife - Links to all of my products and discounts
L9 works on the 2023 Silverado 1500 5.3 V8! I tested it today to and from work. Managed to get close to 22mpg with speeds up to 62mph. No vibration, no weird sounds, and no transmission weirdness!
Does it still work? I'm from Germany and I recently bought a 2022 Chevy Trailboss with the 5.3 l / 10 speed engine and I heard from the problems with the lifters. So I think about to buy the Pulsar LT to avoid this. I'm a bit concerned...
Thanks for the follow up on this after a year of changing your driving pattern and sharing your experience of using L9 around town for an extended period of time.
From what I've heard, once the lifter has "deactivated" and has been commanded to go back into use, is where the problem exists. They drop out and won't come back without some damage being done to the lifter, getting stuck and damaging the cam. my thought is that if you prevent the lifters from going relaxed in the first place, it lessens the chances of effing up.
Doesn't the problem exist when they are constantly having to work in different driving conditions?? Is it a "damned if you do and damned if you don't" scenario?
@@edscorsese It could be, but I think that if you're going to have something activating and deactivating hundreds or thousands of times a day that eventually it's going to fail. If you don't work the device, it's less likely to screw up.
I’m a mechanic by trade but been in the collision industry last few years. I can’t picture how they have lifters set to deactivate. Seems like it would be on a compression stroke maybe the exaust would stay open? I don’t get it. I’ll have to see some videos of it mechanically working I guess
I did this also, as for mileage with my Silverado I've seen more variation depending if I had a headwind or not. My transmission temps down the hiway did increase to just over 200*, not really a good idea but not a deal breaker either. As for extending the life of the lifters it will. The lifter collapses when it unlatches and gets stuck in that position, if it never shifts it doesn't get stuck. Because of that I installed a AFM/DOD eliminator to check operation. It was 50 bucks, plugged into the ALDL port on my truck and works great. No more shifting cylinders, the trans runs over 15* cooler running down the hiway and it shifts much better with no lag waiting for a proper engine state to complete a shift. You can run around in manual mode but for the minimal cost the plug in mod it works very well for me and I don't have to think about anything except much better performance.
Great video. I bought a 22 Silverado, and it told to me that unlike the previous models, the newer engine didn’t just go from 8-4. The dealer told me that, with my 8 speed transmission, the deactivation could do any of 18 different modes, including dropping to only 2 cylinders. Now, I kept that truck about 18 moths, and found it to be very good at handling whatever was needed. After helping one friend with moving his belongings (including towing a car) from VA beach to Jax, we could tell when it was dropping down to 4 cylinders, due to my after market exhaust. What really truly impressed me though was driving from Tri Cities Tennessee out to Palm Springs to tow home a 1978 Thunderbird Diamond Jubilee edition. On straight runs, and running
How are you telling that the truck dropped down to 2 cylinders? I don't know of any indicator that says whether DFM is active, let alone how many cylinders it has dropped down to.
Just watched this video. I have a pulsar LT, and I've been using it for over a year now with no negative effects . As far as shifting back in and out of manual mode to L9. That's just something I personally don't want to mess with. I like most of your mods and I'm in the process of doing several on them to my 2020 GMC 1500 Texas Addition. I'm not interested in doing a full exhaust I'm just doing a muffler, and looking for a good pair of quad tips that doesn't take the bank to buy. Keep up the good work. I really enjoy all your videos.
I had 2014 with afm. Bought Range AFM disabler. It kept my SILVERAYDO in V8. I read up on it before purchasing, and some said that they lost a couple of miles some said that they stayed the same and very few said they gained couple as I did. But in all everyone one was happy with the purchase. At the time it was $200. I’m sure it’s gone up a little but it’s something to look into. They do have one for DFM.
For the newer V8s with 10spd transmissions, the PulsarLT is the only plug-in option. It is $500+ depending on where you are and ordering it from. The install is a little more involved but still DIY
@@Donslife right on a buddy of mine bought a 2022 Sierra I was telling him about it so looked it up to verify if it worked for DFM ( it’s says it does on the range website ). Also looked for it on here and nothing for range DFM but pulsar LT. Thanks for the clarification, bud.
I used the system for over a year. Used a full tank of fuel over my normal driving week on average. Then started using L9 mode to prevent it activating. Started using only a half a tank of fuel during my normal driving week. Tested this by again using the system again a full tank a week. Went back to L9 moded again only a half a tank of fuel a week. I now only use L9 mode in my silverado. This is every day normal weekly driving. I haven't tested it for long distance freeway mileage. This is just my normal every day driving.
I've tried the L9 selection method for disabling the DFM in my 2023 Yukon XL and it appears to work as advertised. However, because my daily driving includes both town & country (highway) roads, I'm not sure how fast I should be driving before it becomes detrimental to the engine and should be switched back to the Drive mode. I'd like to purchase a Range Technology Plug & Play AFM/DFM Active Fuel Management Disabler; however, they don't yet make one for the 2023 GMC Yukon XL. 😕
Great video very informative. I use this also in my 2012 Silverado. But I am taking it to a shop that will do a AFM disable through an HP tuner then I’ll be able to use six gear again, I believe my gas mileage will be almost as good as if it used AFM.
I have a 2020 with the 5.3 8-speed. Shifting to L7 does NOT disable the DFM on mine. It still dropped cylinders. Finally broke down and purchased the Pulsar LT. Well worth the money to no longer hear the choppy sound of the DFM. As an added bonus my exhaust has a spectacular sounding gurgle thru my flowmaster while slowing down with it disabled.
@@unscproductions5023I’ve had zero issues. It’s been installed now for 3 years. I really like the adjustable throttle. Not for hot rodding though. But for pulling our camper. Adjusting it to be more sensitive while towing keeps me from having to push the throttle as much. When normal driving I actually keep it turned to 10%negative to make it less sensitive.
I have 08 Silverado. Installed a A F M disabled. It has a 6 speed. 350k did pretty good. Changed oil religiously. Did pretty good...But it has worn out not only collapsed inner spring loaded but camshaft to. Very expensive repair. Love the truck. Other wise. Very dependable. 👍🏻 5.3 by the way
I have had 2 - 6.2's and my 2015 lifters failed, after replacement I immediately disabled AFM and never had another problem. My current truck is a 2020 AT4 and I disabled the AFM as soon as I got the truck, 45k no problems. I highly recommend deleting or disabling the AFM immediately, I would rather be safe than sorry. Engines were not made to run this way. I personally also have a catch can as well that I empty regularly between oil changes with lots of nasty goo inside that I would not want going back into the top of my engine. Cheers!
So I actually did try this, and it does work!! It truly does do everything you stated, however by pushing the DFM/AFM button on the dash located below the radio, it does the same thing and will give you access to all 10 gears, or whatever your transmission may have.
@Donslife It's the Auto Start Stop button. It has an "A" with a Circle around it. It's usually the third on over from the left next to Park assist. I have a 2020 High Country with a 6.2 10sp.
I do a lot of travel in the mountains here in Oregon and oftentimes have to use the L gears when coming off the mountains behind slower traffic and not relying quite so much on the brakes. I didn’t realize I could switch to manual L7 (I have the 8 speed) while at a standstill. Thanks for that tip!
Thanks Don for this very informative video. I was wondering about everything that you were telling us about. Specially the info on driving in L9 to avoid lifter failure. I just experienced this problem in the last month. I had to have all of the left bank lifters replaced on my 2020 GMC Sierra Elevation 5.3 liter because of lifter failure. I only have 12,500 miles on the truck so it was still under warranty and GM covered the cost. So when I found your first video on driving in L9 and how it might avoid lifter failure I was very happy. Now, after hearing what you said that it would not prevent lifter failure I not very happy😢. Thanks again for the information I do appreciate it. 👍
@@Donslife So, then, I'm going to assume you no longer suggest switching to L9? If it's accurate to say that it is only a matter of time before the lifters fail, then I'd rather run it in D and let the failure begin while my truck remains under warranty rather than delaying the inevitable and getting stuck with a repair bill after the expiration of warranty.
The products, such as the Range Disabler, help with lifter failure. In fact, my GM tech told me the lifters fail because they're not in use. Of course, that was an off-the-record comment, but I trust his opinion since he sees so many of these issues at the dealer.
The number next to the L is the top gear you want the trans to go to. Like if you are towing something. You don’t want it to go into 10th because it’s an extra overdrive. Basically means that every time you touch the pedal, it will shift. Lowering the top gear while towing will lower your amount of gear hunting at higher speeds and keep you in a better power band.
"A bad lifter is a bad lifter. Even with DFM deactivated the lifter will eventually fail". I wanted a GMC Sierra Elevation but I can't buy one with the multiple quality issues of which the lifter issue is at the top. Only real option is a used Tundra prior to the change to the twin turbo mess.
I have a 2013 Silverado Lt 5.3. I bought it used with 160k on it. At about 170k I had my first misfire on cylinder 7. I changed the plugs( #7 was burnt to a crisp). I didn't have any problems till about 190k and in one week I had 2 more misfires on cylinder #7 . At this point I did some research and found your video and applied your method to my every day driving and I'm at 200k and haven't had a misfire since. I get in put the trunk in Manuel and shift to 5th gear and pullout. no issues whatsoever. I also have done a muffler delete and still no issues to date.
I have a 2016 5.3 with AFM. I have the range afm disabler and it works. The engine stays 100% on 8 cylinders. I don’t know if it’s going to prevent lifter failure but the truck drives much better.
Hey Don! Thank you so much for representing the true north so well. I have a 2021 Sierra 1500 Elevation with the 5.3. I wish I was still blissfully ignorant to this issue but recent issues and codes are seeing my truck head to the dealer for service. I’ll find out tomorrow or early next week if this is my issue. I’m wondering though, since you did this about 9 months ago, are you still running around town in L9 and what has your longer term experience been? I’ve also been considering the Pulsar. If my problem isn’t actually lifters it may be beneficial for me to consider either of these options in the hopes of saving trouble later!
I have been using this "manual mode" or L5 mode (6 speed transmissions) for several years now, on a 2016 Chevy 5.3L and on my 2018 Chevy 5.3L Silverado. It definitely stops the afm & stays running on all 8 cylinders. Several years ago, I asked my local GMC dealer service manager if A) does this really work and B) does it cause any problems or harm? He said yes it does work, and it causes no problems. I think I might be getting slightly less mpg but the difference is so little I don't notice it. As I am an old school guy, I think running it always in the 8 cylinder mode is easier on the engine.
Lifter failures at higher mileage is caused by waiting too long to change engine oil. 7k is waaaaaaay too long. 5k is pushing it, too much if there is a lot of short tripping in cold weather. Changing it by 4k is probably a good balance. Learn about the abrasive soot that direct injection makes and how that soot ends up in the oil. Learn about how full synthetic reacts when the engine is short tripped in cold weather.
Hi Don I have exact same truck as yours year, Color, options. I hate the auto shut off/start, and DFM. Your videos have been most helpful. Cheers from Ontario
@@JeffBarnaby-p8e See the problem with what you're saying is that in 99 the 5.3 didn't have all the extra AFM/DFM/DoD crap in it. So yes they were mechanically much more simple, reliable engines that are still on the road in vast numbers today having never been rebuilt. Once GM introduced the cylinder deactivation their reliability went through the floor because of variable state hydraulic lifters that can collapse and take the cam out causing you to need a serious rebuild that could get you to the $10k mark in repairs. Do you really want to buy a $40k truck that will likely need a $10k engine rebuild within 100k miles? I certainly don't. I recently sold my 2004 Silverado 1500 with the 4.8l V8 to a family member who was in bad need of a truck to work in. So when I buy another truck for myself (currently I can get around using either my primary or backup work van) I'm definitely not going to be buying a GM product specifically because of these engine issues. At this point I'd feel safer with a Ford with a 2.7l ecoboost than I would a GM engine with all the cylinder deactivation crap. I'll probably try to find a nice F150 with the 5.0 in it because at least it didn't have that crap (until either the 23 or 24 MY)
My truck is a 2008 GMC Sierra 1500 5.3. My display is manual lettering no digital. I recently got the Engine code of P3400 Cylinder 1 deactivaton solenoid. I don't see a way to disable AFM.
besides disable afm these silverados need a oil catch can. Otherwise engine carbons up and starts blowing out lifters and clogged piston rings. After 3000 miles mine has a full catch can of oil and sometimes moister. This would normally be circulated back into the engine where it burns up.
At 3:20 in this video I’m on the same page as you. Before my muffler delete mileage was up. Now with some good V8 noise mileage is down lol. Letting my 6.2L sing 🔊🔊
I have a 2018 Silverado 5.3 and an 8 speed transmission with a little over 58K miles. I drive in L7 almost all the time. I have notice at freeway speeds the rpm's are higher in L7 than in L8 or Drive. I would assume that means the fuel economy might be lower in L7. I don't check my mileage and the benefit of constant V8 power matters to me.
The way cylinder deactivation works on a DOHC engine is totally different compared to a pushrod OHV engine. That isn't to say it will be reliable. Even Honda has had issues due to their use of cylinder deactivation.
Hey Don, I've been binging your videos today because it's cold outside today 25F. Yeah,yeah,I know that's a heat wave for y'all in Canada. Anyway, I was wondering if the street sign at the 3 minute mark is a "Watch for Squatch" sign?
I just bought a 2024 Sierra 1500 elevation w/ dfm. Very helpful stuff. I love the truck but this is definitely something I’ll keep an eye on. I’ll prob drive on L9 to be safe, but also turn off the auto start/stop. Seems like this is the only worry with these trucks. Better than other defects with other trucks in my opinion. Anything else I could do to help prevent any dfm issues?
@@Donslife good to know. Thank you. I was driving in D today and i have an on/off button on my stop/start. Any time i drive in D I just turn that off too. Pretty smooth to be honest. I don’t feel any jump when i drive or lack of power. I’m gonna read the manual more when i get some time. Might start making videos about the truck also. Not many people on RUclips that I see have these trucks.
I just bought a 07 Silverado i didn't know anything about afm so when u found out i got sick to my stomach but come to find out the previous owner had did a complete afm delete he did the lifters push rods cam shaft also he got rid of vvt so i dont never got to worry about liter failing because it doesn't have arm lifters no more that god
Either trade it in just before warranty ends or totally delete/remove the AFM system or you’ll still have those faulty lifters in place. Mine bent the push rods and damaged the cam shaft which resulted in more work.
3rd gen escalade .2012...looking at options. What's the different between a disabler and the kit with new cam? Obviously price. But long term any difference ? Chip is cheaper and faster but is it more risky?
I just bought a brand new Tahoe 2024 with a 6.2 L engine and I saw your video and I was worried about it. I just got rid of a 2024 Duramax pick up truck diesel engine 2400 HD and believe me when I took it for inspection they said oh you need a software update at that point I said to myself all right I’m treating this piece of junk in and getting a Tahoe and now I found out about all this engine stuff so I did what you actually said I went to work one morning and there’s hardly anybody on the road so I did put it in L9 and you’re absolutely right it makes a world of difference, also when you’re sitting at a stoplight or a stop sign, the oil pressure doesn’t move as much so I know now that the solenoids aren’t firing. The oil is rocksolid now in L9. Thank you very much for the video very informative and you’re a professional when you make these videos really happy the truck runs really good and L9 now thank you again.
I have a 2024 Silverado 3500HD SRW with Duramax and had to get the emmisions software update with no difference is operation. The factory only downloaded part of the program and there was a recall on the emmisions. As a matter of fact, my check engine light did come on and I did the OnStar diagnostics check and they told me it was the emmisions. But as far as the 2024 Duramax being a piece of crap, it's one of the finest trucks I have owned. I had a 2021 Duramax before it and this one if significantly better.
Question is if you are changing these parameters around and then take the truck back for service work at the dealership will these codes show up ? Will the dealership try & void warranty based on changing those parameters ?
I could try to explain it to you but if youre not a mechanic you wouldnt understand why deactivating dfm will absolutely prolong if not completely prevent lifter failure dfm lifters have 2 seperate oil passages its hard to explain but basically the part of the lifter that allows it intentionally to collapse to deactivate it by deactivating it you arent working that part of the lifter which means again you greatly reduce if not eliminate possible failure people really dont understand how they actually work and the best thing you can do if youre not going to do it the right way and do a full mechanical delete then you atleast need to get a tune that completely deactivates it
@donslife I was told that driving in L9 could have some negative affects on the transmission because of the change in RPMs versus being in drive… I’ve been driving in L9 99% of the time even in highways and haven’t had any issues. Have you heard of any issues.
I have a 2019 5.3 with the 8 speed, and I gather in the city. Switching to L7 is the best option, and then moving back to D when doing the major hwy.. Regular mtce oil changes ever 5,000-6,000km full synthetic.. 140,000km no issues so far, but I like the technique. Plus, like you said it is a truck, so you have to drive that bitch. Great video..
What aftermarket Device would you recommend to take care of auto stop and DFM? I know there is the pulsar device but dang 600 bucks is steep. Any other options? I would rather not go to L9
I’d love be to know if my rumble on decel at 25-30mph is DFM, VVT, or torque converter. Does it M7 and M8. 2020 5.3 8-speed. So many systems cause similar problems.
AFM or DFM can activate in all modes except manual mode which is L9 in my case. It operates when the engine is below certain load thresholds. I am not the expert, but if you drive in towing mode, you’re just setting your transmission to hold the gears longer before shifting up. When you go down a hill or coast, AFM/DFM may start engaging until you put more load on the engine.
I put 0 miles engine from gm on my 2020 denali and from day 1 has de range technology chip , so we'll see if using 8 cyl all the time improves engine life
Thanks for the tip Don! I just put a new Flowmaster muffler on mine with the 5.3 liter and 8 speed tranny. The new exhaust sounds great til it’s in 8th gear, and just cruising around town, then sounds horrible, as it kicks into V4. I tried L7 , and it was magic. In highway driving I just use D
I am not comfortable with this new generation of truck's to buy one. I guess you figured it out, I'm old. Give me something problem free and I'll deal with fuel economy.tks for the video. 70 from pa.
my yukon has a corsa driving in L9 the sound is more consistent the only issue is when I drive over 80 i have to shift either back to D or L10 otherwise the rpm will keep increasing
Do you notice when in L9 when coming to a stop it has a harsh downshift right before you come to a stop ? In D, it gives an engine/exhaust surge, but it’s only noise. The feel and shifting is smooth. In L9 the decel exhaust noise is great, but the last downshift before full stop is noticeable to me. Wondered your experience. Lastly is your column shifter loose feeling when in D. Mine has “slop” up and down. Thanks Great videos !!
Great Video Don! 2021 GMC Sierra 1500 AT4 with 6.2L with ~39k miles started sputtering with ticking and loss of power (has to be the lifter failure). I was able to limp into the shop. I personally change my oil religiously and the dealer is asking for all receipts to make sure there is no negligence to the motor. I have my own notes of when I changed the oil and some credit card statements showing where I purchased the oil (mobil 1) which I provided. I recently changed the oil 2 months ago and the dealer should be able to see that clean oil is in the system. Like you all, I am a GM guy, having ZL1, ZR1 and my AT4. Hopefully GM does not try to screw me over from a warranty claim. Any thoughts on how to defend my position of not neglecting my engine? Your thoughts are greatly appreciated.
We are about to receive our 2023 1500 Sierra 6.2/10 speed. Though we are not happy about the DFM. Thank you for the follow-up video. Your truck sounds so good. I'm sure you did a video on your after-market exhaust, I'll look for it in your playlist. Was curious what you had installed. Thanks again ✌️out.
Nice 👍🏼 Here is the video : BORLA S-Type Cat Back Dual Exhaust Install Review 2019 - 2021 GMC Sierra Chevy Silverado 6.2L ruclips.net/video/lzjipXNF1UM/видео.html
I have a 2015 Chevy silverado.the number 4 cylinder went on it and the cost to replace it was 4 thousand dollars.i love it delete in my truck it runs way better then it did
I have a 23 Escalade and you have a DFM delete module for your truck but do you have one for Mrs. Donslife truck and if so were did you purchase it from
I don’t have a DFM disabler for either vehicle. We can shift to L9 and it works fine. As for which to buy, Pulsar LT is the most compatible with 6.2’s and the 10 speed transmission.
L9 all the time, no shifting at all. The only time I shift back to Drive is if I am going to be on the highway for a road trip. Around the city, 100% L9
What about driving in sport mode it kicks into lower gear? Does that help to disable activate fuel management. I feel that it runs better in sport mode.
At also works in a 6 speed tranny. I use the 5th gear when driving on back roads and around town. I actually gained fuel mileage on back roads doing that. The DFM never engaged.
@Donslife Thanks for the information. I been driving on L10 thinking no DFM, cuz Auto start stop doesn't function when on L10. I guess I will try L9 and see if I feel any differences.
I have found and plan to purchase a 2014 Silverado High Country with the 6.2L. Is manual mode available (L5 on the 6-speed) and, if so, is a separate AFM/DFM disabler necessary? Thanks.
Chevy 2007 5.3 with 94k miles has excess oil consumption (1 qt per 900miles) Some theory is AFM may be partial to blame,,, as well as the valve cover oil passages being the prominent issue. What are your thoughts on AFM in relation to oil consumption? TIA, Keith
my 2017 50th Anniversary 2SS Camaro doesn't work this way. I have an 8 speed, and in manual mode, if I am in "M7" if my RPM's drop to a certain point when cruising it will actually still drop to V4 mode. I ordered a RANGE disabler... Now, I will say that if I leave it in an even lower gear it will mostly stay in V8 mode, but not just 1 gear down. at 55 - 60 MPH I have been running in about 5th gear or so, which is a higher rev (around 2800 RPM etc) and it will stay in V8 mode.
I haven’t since I didn’t end up getting a Pulsar LT. However a small group of users claim to have various electrical bugs with power steps, blind spot monitoring and more
As a long time mechanic I disagree that disabling the DFM system won't help with reliability. The collapsible lifters have a release pin that when activated, allows the lifter to go into collapse mode. Just like anything mechanical, the more times those parts are activated, the more wear you will have on those parts to eventually cause a failure point. If the system is disabled full time you are far less likely that those lock pins will wear. Also, each time those parts are activated and then deactivated is a chance that they will not function correctly. Take away those chances are your failure percentage is much improved. As far as fuel economy, I don't have experience with GM but some experience with a Ram Hemi, MDS system (same concept as GM). The Ram I had actually seemed to get better fuel economy on the highway with the system disabled. I noticed that on sharper hills, the delay time of the MDS system deactivating actually caused the engine to need to 'recover' speed. Not so when deactivated manually. In city driving, the MDS seemed to help economy a bit.
I agree with you. I have to be mindful of how I phrase things on RUclips. Someone might claim ‘you promised this would or wouldn’t happen’ and cause some unnecessary drama.
not sure if i missed the detail but does this only apply to certain years? im looking to pick up a 2007 yukon denali 6.2 in a few days, is this manual mode bypass going to be a thing for me ?
I believe it started with 2007-2013, 2014-2018) as AFM (4cyl mode) and DFM later. At least for the Sierra’s. You can use manual mode or purchase a inexpensive AFM disable device in your case
What about the backpressure exhaust valve? I heard I can turn it counterclockwise and put a #8 bolt through it so it stays open. Will that hurt anything? Also about disabling the Dynamic Fuel Management system, can I have it tuned and disable that way?
Yeah I'm do for my first free oil change so I'm going to let the dealer look at it. My first thought was bad gas also. I put Lucas fuel treatment in it and new fuel no change. Just wondering if you had the issue before.
![Lifter Failures - Class Action Lawsuit Silverado [GM] AFM / DFM: 2014 - 2021 GM V8s](http://i.ytimg.com/vi/M1BgCsxFdPM/mqdefault.jpg)
Check out my sponsor LetsGetChecked trylgc.com/donslife
Use Code DONSLIFE for 25% off your home test kit
linktr.ee/donslife - Links to all of my products and discounts
Does your truck have the 6.2 L engine
@@SKANK_HUNT49 yes it does
@Donslife ty so just lock out 10th gear and it will fire on all 8 cylinders?
Will the gears still shift all the way through on L9?
L9 works on the 2023 Silverado 1500 5.3 V8! I tested it today to and from work. Managed to get close to 22mpg with speeds up to 62mph. No vibration, no weird sounds, and no transmission weirdness!
Thank you for the update! The viewers will appreciate it!
Facts
Why do you even care about fuel mileage ? You bought a full sized truck ! Drive it like you stole it screw gas mileage or sell it and get a Prius
@RayTuttle-of5qd It's not about the fuel mileage... It's about the engine shutting down cylinders!
My 2021 Silverado was built during the chip shortage. It was built without DFM. I get 22 mpg. 5.3. True V8. No problems at all
How would one know if their 21 has the dfm chip or not?
@@Nectaris73 it was on my build sheet. I forget the exact code but it would be on it.
@@Nectaris73RPO YK9
😂
@@Nectaris73 There is a $50.00 deduct on the window sticker stating DFM delete.
I purchased a Pulsar LT a year ago, totally happy with the purchase. I wish GM would cancel the Autostop and DFM in their motors.
I did the same and I love it!
The auto stop in my 2020 trail boss has an on/off button.
Our government makes manufacturers reach high mileage requirements.
Does it still work? I'm from Germany and I recently bought a 2022 Chevy Trailboss with the 5.3 l / 10 speed engine and I heard from the problems with the lifters. So I think about to buy the Pulsar LT to avoid this. I'm a bit concerned...
@@insideoutsideupsidedown2218 my 2019 does too, but you have to push it every time you get in the truck. Pulsar disables it permanently
Thanks for the follow up on this after a year of changing your driving pattern and sharing your experience of using L9 around town for an extended period of time.
For sure!
From what I've heard, once the lifter has "deactivated" and has been commanded to go back into use, is where the problem exists. They drop out and won't come back without some damage being done to the lifter, getting stuck and damaging the cam. my thought is that if you prevent the lifters from going relaxed in the first place, it lessens the chances of effing up.
Doesn't the problem exist when they are constantly having to work in different driving conditions?? Is it a "damned if you do and damned if you don't" scenario?
@@edscorsese It could be, but I think that if you're going to have something activating and deactivating hundreds or thousands of times a day that eventually it's going to fail. If you don't work the device, it's less likely to screw up.
I’m a mechanic by trade but been in the collision industry last few years. I can’t picture how they have lifters set to deactivate. Seems like it would be on a compression stroke maybe the exaust would stay open? I don’t get it. I’ll have to see some videos of it mechanically working I guess
@@sferg9582seems once it's deactivated it's permanent unless you remove the disabler.
Lifters are the failure.
I did this also, as for mileage with my Silverado I've seen more variation depending if I had a headwind or not. My transmission temps down the hiway did increase to just over 200*, not really a good idea but not a deal breaker either. As for extending the life of the lifters it will. The lifter collapses when it unlatches and gets stuck in that position, if it never shifts it doesn't get stuck. Because of that I installed a AFM/DOD eliminator to check operation. It was 50 bucks, plugged into the ALDL port on my truck and works great. No more shifting cylinders, the trans runs over 15* cooler running down the hiway and it shifts much better with no lag waiting for a proper engine state to complete a shift. You can run around in manual mode but for the minimal cost the plug in mod it works very well for me and I don't have to think about anything except much better performance.
Great video. I bought a 22 Silverado, and it told to me that unlike the previous models, the newer engine didn’t just go from 8-4. The dealer told me that, with my 8 speed transmission, the deactivation could do any of 18 different modes, including dropping to only 2 cylinders.
Now, I kept that truck about 18 moths, and found it to be very good at handling whatever was needed. After helping one friend with moving his belongings (including towing a car) from VA beach to Jax, we could tell when it was dropping down to 4 cylinders, due to my after market exhaust.
What really truly impressed me though was driving from Tri Cities Tennessee out to Palm Springs to tow home a 1978 Thunderbird Diamond Jubilee edition.
On straight runs, and running
How are you telling that the truck dropped down to 2 cylinders? I don't know of any indicator that says whether DFM is active, let alone how many cylinders it has dropped down to.
@@greghale717 I just did some research bc I could hear the different tones from the engine.
Plus the dealer had told me to be aware
Two cylinders? 😮 wow, learn something new everyday. That was a good read. Thanks for the info. Enjoy!
Just watched this video. I have a pulsar LT, and I've been using it for over a year now with no negative effects . As far as shifting back in and out of manual mode to L9. That's just something I personally don't want to mess with.
I like most of your mods and I'm in the process of doing several on them to my 2020 GMC 1500 Texas Addition. I'm not interested in doing a full exhaust I'm just doing a muffler, and looking for a good pair of quad tips that doesn't take the bank to buy. Keep up the good work. I really enjoy all your videos.
I had 2014 with afm. Bought Range AFM disabler. It kept my SILVERAYDO in V8. I read up on it before purchasing, and some said that they lost a couple of miles some said that they stayed the same and very few said they gained couple as I did. But in all everyone one was happy with the purchase. At the time it was $200. I’m sure it’s gone up a little but it’s something to look into. They do have one for DFM.
For the newer V8s with 10spd transmissions, the PulsarLT is the only plug-in option. It is $500+ depending on where you are and ordering it from. The install is a little more involved but still DIY
@@Donslife right on a buddy of mine bought a 2022 Sierra I was telling him about it so looked it up to verify if it worked for DFM ( it’s says it does on the range website ). Also looked for it on here and nothing for range DFM but pulsar LT. Thanks for the clarification, bud.
Got the range in my 17’ 5.3 Silverado. Seeing 1 mile less mpg . Very minimal -
Bought one the other day on Amazon for $220
I used the system for over a year. Used a full tank of fuel over my normal driving week on average. Then started using L9 mode to prevent it activating. Started using only a half a tank of fuel during my normal driving week. Tested this by again using the system again a full tank a week. Went back to L9 moded again only a half a tank of fuel a week. I now only use L9 mode in my silverado. This is every day normal weekly driving. I haven't tested it for long distance freeway mileage. This is just my normal every day driving.
This is absolutely AWESOME! Thank you for this information and I can't wait to try this out on my 2020 High Country that has the 6.2 10sp.
You’ll notice a difference! Thanks for watching!
Appreciate your videos Don! Always great clear info!
They do sell a full delect kit for this it replaces the cam, lifter pushrods.
Cool, who is offering it. I’d like to know more
Very interesting, and very well done. Thanks for sharing!
You’re welcome. Thank you for watching
I've tried the L9 selection method for disabling the DFM in my 2023 Yukon XL and it appears to work as advertised. However, because my daily driving includes both town & country (highway) roads, I'm not sure how fast I should be driving before it becomes detrimental to the engine and should be switched back to the Drive mode. I'd like to purchase a Range Technology Plug & Play AFM/DFM Active Fuel Management Disabler; however, they don't yet make one for the 2023 GMC Yukon XL. 😕
Don, I really enjoy your videos. They are very real life improvement and very informative. Keep them coming.
Thanks, will do!
Great video very informative. I use this also in my 2012 Silverado. But I am taking it to a shop that will do a AFM disable through an HP tuner then I’ll be able to use six gear again, I believe my gas mileage will be almost as good as if it used AFM.
I have a 2020 with the 5.3 8-speed. Shifting to L7 does NOT disable the DFM on mine. It still dropped cylinders. Finally broke down and purchased the Pulsar LT. Well worth the money to no longer hear the choppy sound of the DFM. As an added bonus my exhaust has a spectacular sounding gurgle thru my flowmaster while slowing down with it disabled.
How has your experience with it been in thinking about getting one for mine but I’ve heard mixed reviews
@@unscproductions5023I’ve had zero issues. It’s been installed now for 3 years. I really like the adjustable throttle. Not for hot rodding though. But for pulling our camper. Adjusting it to be more sensitive while towing keeps me from having to push the throttle as much. When normal driving I actually keep it turned to 10%negative to make it less sensitive.
I have 08 Silverado. Installed a A F M disabled. It has a 6 speed. 350k did pretty good. Changed oil religiously. Did pretty good...But it has worn out not only collapsed inner spring loaded but camshaft to. Very expensive repair. Love the truck. Other wise. Very dependable. 👍🏻 5.3 by the way
Can’t complain too much with 350k
Excellent video! Thanks! I’ll be looking for all your future videos!
I have had 2 - 6.2's and my 2015 lifters failed, after replacement I immediately disabled AFM and never had another problem. My current truck is a 2020 AT4 and I disabled the AFM as soon as I got the truck, 45k no problems. I highly recommend deleting or disabling the AFM immediately, I would rather be safe than sorry. Engines were not made to run this way. I personally also have a catch can as well that I empty regularly between oil changes with lots of nasty goo inside that I would not want going back into the top of my engine. Cheers!
I have the Pulsar, but I don't think it works for the refresh just yet.@rxw5520
Good to know. I just got a 5.3L V8 Elevation. Had no idea about these issues. Will buy a Range to put in to disable and keep it in V8 mode.
How big of an expense is lifter replacement on a 6.2L? Thanks.
Very helpful!!!! Coming from a tacoma to a new silverado I was not aware of this issue
Right on
So I actually did try this, and it does work!! It truly does do everything you stated, however by pushing the DFM/AFM button on the dash located below the radio, it does the same thing and will give you access to all 10 gears, or whatever your transmission may have.
Which button would you be referring to exactly and on what vehicle/model year?
@Donslife It's the Auto Start Stop button. It has an "A" with a Circle around it. It's usually the third on over from the left next to Park assist. I have a 2020 High Country with a 6.2 10sp.
@@kevinvoytosh416yes, I am aware. Unfortunately deactivating Auto Start/Stop doesn’t deactivate DFM, but I sure wish it did!
I’ve been running my 2019 5.3 in L5 for a year with no issues other than that annoying clicking stops. I always thought it was my transmission
so it stopped the clicking?
I just purchased a 2023 Silverado RST 5.3
I will see if this works in it and update you tomorrow!
Well?
@@trounbyfire it did work...
I do a lot of travel in the mountains here in Oregon and oftentimes have to use the L gears when coming off the mountains behind slower traffic and not relying quite so much on the brakes. I didn’t realize I could switch to manual L7 (I have the 8 speed) while at a standstill. Thanks for that tip!
Thanks Don for this very informative video. I was wondering about everything that you were telling us about. Specially the info on driving in L9 to avoid lifter failure. I just experienced this problem in the last month. I had to have all of the left bank lifters replaced on my 2020 GMC Sierra Elevation 5.3 liter because of lifter failure. I only have 12,500 miles on the truck so it was still under warranty and GM covered the cost. So when I found your first video on driving in L9 and how it might avoid lifter failure I was very happy. Now, after hearing what you said that it would not prevent lifter failure I not very happy😢. Thanks again for the information I do appreciate it. 👍
Ya it has been a learning experience for me too. Subpar components can fail anytime. Thank you for watching!
@@Donslife So, then, I'm going to assume you no longer suggest switching to L9?
If it's accurate to say that it is only a matter of time before the lifters fail, then I'd rather run it in D and let the failure begin while my truck remains under warranty rather than delaying the inevitable and getting stuck with a repair bill after the expiration of warranty.
The products, such as the Range Disabler, help with lifter failure. In fact, my GM tech told me the lifters fail because they're not in use. Of course, that was an off-the-record comment, but I trust his opinion since he sees so many of these issues at the dealer.
I don't have DFM and my lifters have gone twice in 1st 6000km. So I doubt disabling it matters at all.
The number next to the L is the top gear you want the trans to go to. Like if you are towing something. You don’t want it to go into 10th because it’s an extra overdrive. Basically means that every time you touch the pedal, it will shift. Lowering the top gear while towing will lower your amount of gear hunting at higher speeds and keep you in a better power band.
"A bad lifter is a bad lifter. Even with DFM deactivated the lifter will eventually fail". I wanted a GMC Sierra Elevation but I can't buy one with the multiple quality issues of which the lifter issue is at the top. Only real option is a used Tundra prior to the change to the twin turbo mess.
I have a 2013 Silverado Lt 5.3. I bought it used with 160k on it. At about 170k I had my first misfire on cylinder 7. I changed the plugs( #7 was burnt to a crisp). I didn't have any problems till about 190k and in one week I had 2 more misfires on cylinder #7 . At this point I did some research and found your video and applied your method to my every day driving and I'm at 200k and haven't had a misfire since. I get in put the trunk in Manuel and shift to 5th gear and pullout. no issues whatsoever. I also have done a muffler delete and still no issues to date.
Thanks for sharing
I have a 2018 1500 5.3 had the DFM turned off by a tuner I know locally and it now gets 23 mpg while running all 8 cylinders.
How much charge?$$???
I have a 2016 5.3 with AFM. I have the range afm disabler and it works. The engine stays 100% on 8 cylinders. I don’t know if it’s going to prevent lifter failure but the truck drives much better.
I hear ya
Hey Don! Thank you so much for representing the true north so well. I have a 2021 Sierra 1500 Elevation with the 5.3. I wish I was still blissfully ignorant to this issue but recent issues and codes are seeing my truck head to the dealer for service. I’ll find out tomorrow or early next week if this is my issue. I’m wondering though, since you did this about 9 months ago, are you still running around town in L9 and what has your longer term experience been? I’ve also been considering the Pulsar. If my problem isn’t actually lifters it may be beneficial for me to consider either of these options in the hopes of saving trouble later!
I have been using this "manual mode" or L5 mode (6 speed transmissions) for several years now, on a 2016 Chevy 5.3L and on my 2018 Chevy 5.3L Silverado. It definitely stops the afm & stays running on all 8 cylinders. Several years ago, I asked my local GMC dealer service manager if A) does this really work and B) does it cause any problems or harm? He said yes it does work, and it causes no problems. I think I might be getting slightly less mpg but the difference is so little I don't notice it. As I am an old school guy, I think running it always in the 8 cylinder mode is easier on the engine.
Lifter failures at higher mileage is caused by waiting too long to change engine oil. 7k is waaaaaaay too long. 5k is pushing it, too much if there is a lot of short tripping in cold weather. Changing it by 4k is probably a good balance. Learn about the abrasive soot that direct injection makes and how that soot ends up in the oil. Learn about how full synthetic reacts when the engine is short tripped in cold weather.
I change every 3000 miles
3000 mile oil change full synthetic ! Oil is cheap machined metal parts are expensive !
I appreciate your videos.
If only I had known that L9 trick before I bought a pulsar LT
If your using the PulsarLT for other features it has, then it might be worth it
It's been common knowledge. Guys have been using manual move to disable it since at least 2014.
Always helpful!!!!!!!
Anytime!
Hi Don I have exact same truck as yours year, Color, options. I hate the auto shut off/start, and DFM. Your videos have been most helpful. Cheers from Ontario
Happy to be of service
Waiting to get my truck back from GM now with bad lifters…. Can’t wait to get out of the 5.3 platform. Selling it as soon as it’s fixed
5.3is and has been one of best since like 1999’😮
@@JeffBarnaby-p8e See the problem with what you're saying is that in 99 the 5.3 didn't have all the extra AFM/DFM/DoD crap in it. So yes they were mechanically much more simple, reliable engines that are still on the road in vast numbers today having never been rebuilt. Once GM introduced the cylinder deactivation their reliability went through the floor because of variable state hydraulic lifters that can collapse and take the cam out causing you to need a serious rebuild that could get you to the $10k mark in repairs. Do you really want to buy a $40k truck that will likely need a $10k engine rebuild within 100k miles? I certainly don't. I recently sold my 2004 Silverado 1500 with the 4.8l V8 to a family member who was in bad need of a truck to work in. So when I buy another truck for myself (currently I can get around using either my primary or backup work van) I'm definitely not going to be buying a GM product specifically because of these engine issues. At this point I'd feel safer with a Ford with a 2.7l ecoboost than I would a GM engine with all the cylinder deactivation crap. I'll probably try to find a nice F150 with the 5.0 in it because at least it didn't have that crap (until either the 23 or 24 MY)
There's a delete kit you can buy and install, also a performance tuner (diablo) for dropping the ecm programming. Never have to worry after that.!
The ecm is now locked on the newer GMC/Chevy motors.
@@hockeystop5 HP tuners will get you in, did my '18 when it had 12 miles on it. My boss just had his '23 1500 done loves it.
@@keithschnick5831 how do I go about having HP tuners unlocking my ECM?
My truck is a 2008 GMC Sierra 1500 5.3. My display is manual lettering no digital. I recently got the Engine code of P3400 Cylinder 1 deactivaton solenoid. I don't see a way to disable AFM.
besides disable afm these silverados need a oil catch can. Otherwise engine carbons up and starts blowing out lifters and clogged piston rings. After 3000 miles mine has a full catch can of oil and sometimes moister. This would normally be circulated back into the engine where it burns up.
I’ve been using one from UPR for a couple years now
At 3:20 in this video I’m on the same page as you. Before my muffler delete mileage was up. Now with some good V8 noise mileage is down lol. Letting my 6.2L sing 🔊🔊
I have a 2018 Silverado 5.3 and an 8 speed transmission with a little over 58K miles. I drive in L7 almost all the time. I have notice at freeway speeds the rpm's are higher in L7 than in L8 or Drive. I would assume that means the fuel economy might be lower in L7. I don't check my mileage and the benefit of constant V8 power matters to me.
I shift to Drive when doing highway speeds. L9 for me all around town which is most of my driving
Is the engine switching between 4 and 8 cylinder on the freeway? That is the only reason I drive in L7. Maybe I am wrong.
I've read the '23 Chevrolet Colorado and GMC Canyon have this feature on their 2.7 litre engines, so I'll keep this in mind.
The way cylinder deactivation works on a DOHC engine is totally different compared to a pushrod OHV engine. That isn't to say it will be reliable. Even Honda has had issues due to their use of cylinder deactivation.
Excellent info.
Thanks for Sharing.
My pleasure!
Hey Don, I've been binging your videos today because it's cold outside today 25F. Yeah,yeah,I know that's a heat wave for y'all in Canada. Anyway, I was wondering if the street sign at the 3 minute mark is a "Watch for Squatch" sign?
Hit those like buttons! 😂 The crosswalk sign does look like that. I can’t unsee it
I used the Range Tech to disable my fuel management system on my 2015 until I did the dod delete.
I disabled my 5.3 and it still collapsed a lifter at 97,000 miles along with lots of other issues. I'm done with Chevrolet.
Bought a Diablo tuner just to disable AFM/DOD. My truck still gets 17-19 mpg all city running as a true V8.
They make tuners now for the 2020 and abover trucks? The ecm is locked now from GM.
Why can't gm get it together and make non failing lifters? Does the 2022 have this same lifter issues?
Is there a list of the factors that disable or enable DFM any where? Why is it s big secret?
I just bought a 2024 Sierra 1500 elevation w/ dfm. Very helpful stuff. I love the truck but this is definitely something I’ll keep an eye on. I’ll prob drive on L9 to be safe, but also turn off the auto start/stop. Seems like this is the only worry with these trucks. Better than other defects with other trucks in my opinion. Anything else I could do to help prevent any dfm issues?
When your transmission is in L9, auto stop/start is deactivated too. Some claim that more frequent oil changes can only help too.
@@Donslife good to know. Thank you. I was driving in D today and i have an on/off button on my stop/start. Any time i drive in D I just turn that off too. Pretty smooth to be honest. I don’t feel any jump when i drive or lack of power. I’m gonna read the manual more when i get some time. Might start making videos about the truck also. Not many people on RUclips that I see have these trucks.
I just bought a 07 Silverado i didn't know anything about afm so when u found out i got sick to my stomach but come to find out the previous owner had did a complete afm delete he did the lifters push rods cam shaft also he got rid of vvt so i dont never got to worry about liter failing because it doesn't have arm lifters no more that god
Either trade it in just before warranty ends or totally delete/remove the AFM system or you’ll still have those faulty lifters in place. Mine bent the push rods and damaged the cam shaft which resulted in more work.
Very helpful. I wish they would just add a dfm on/off button
If DFM is off in L9.... that would tax the lifters much less over time and in theory make them last longer no?
If it doesn't help lifter failure then why did the trucks without the V4 mode not have the issue with lifters and cams ? Or did they ??
The V8’s have had cases since 2007. Not all versions had V4 icons to display when AFM was active either.
Good video as always.
I got the Pulsar LT and love it!! You should get one. Thanks!!
When I buy larger diameter tires 🛞
@@Donslife What brand and size tires are you thinking about getting?
3rd gen escalade
.2012...looking at options. What's the different between a disabler and the kit with new cam? Obviously price. But long term any difference ? Chip is cheaper and faster but is it more risky?
Replacing components with a AFM delete would be the permanent long-term fix.
@Donslife got ya
.which i will save for ..but any harm in using a disabler until then? Thanks so.mucj
No harm using a disabler in the meantime
I just bought a brand new Tahoe 2024 with a 6.2 L engine and I saw your video and I was worried about it. I just got rid of a 2024 Duramax pick up truck diesel engine 2400 HD and believe me when I took it for inspection they said oh you need a software update at that point I said to myself all right I’m treating this piece of junk in and getting a Tahoe and now I found out about all this engine stuff so I did what you actually said I went to work one morning and there’s hardly anybody on the road so I did put it in L9 and you’re absolutely right it makes a world of difference, also when you’re sitting at a stoplight or a stop sign, the oil pressure doesn’t move as much so I know now that the solenoids aren’t firing. The oil is rocksolid now in L9. Thank you very much for the video very informative and you’re a professional when you make these videos really happy the truck runs really good and L9 now thank you again.
You traded your Duramax HD truck that was a "piece of shit" because there was a software update?
I have a 2024 Silverado 3500HD SRW with Duramax and had to get the emmisions software update with no difference is operation. The factory only downloaded part of the program and there was a recall on the emmisions. As a matter of fact, my check engine light did come on and I did the OnStar diagnostics check and they told me it was the emmisions. But as far as the 2024 Duramax being a piece of crap, it's one of the finest trucks I have owned. I had a 2021 Duramax before it and this one if significantly better.
Question is if you are changing these parameters around and then take the truck back for service work at the dealership will these codes show up ? Will the dealership try & void warranty based on changing those parameters ?
No you are using the powertrain in accordance with the owner’s manual. Nothing has been modified.
The Pulsar LT works great and does other things as well
I could try to explain it to you but if youre not a mechanic you wouldnt understand why deactivating dfm will absolutely prolong if not completely prevent lifter failure dfm lifters have 2 seperate oil passages its hard to explain but basically the part of the lifter that allows it intentionally to collapse to deactivate it by deactivating it you arent working that part of the lifter which means again you greatly reduce if not eliminate possible failure people really dont understand how they actually work and the best thing you can do if youre not going to do it the right way and do a full mechanical delete then you atleast need to get a tune that completely deactivates it
@donslife I was told that driving in L9 could have some negative affects on the transmission because of the change in RPMs versus being in drive… I’ve been driving in L9 99% of the time even in highways and haven’t had any issues. Have you heard of any issues.
I have heard some people claim that the downshifts are sometimes odd, but nothing alarming
I am definitely going to try the L9 on my 2024 Chevrolet Silverado. Can you use the L9 when on the highway with speeds up to 70-75 mph?
You can but the rpms will stay a little higher. I shift to D personally at that point and DFM is certainly reactivating.
I sure hate that DFM@@Donslife
I have a 2019 5.3 with the 8 speed, and I gather in the city. Switching to L7 is the best option, and then moving back to D when doing the major hwy.. Regular mtce oil changes ever 5,000-6,000km full synthetic.. 140,000km no issues so far, but I like the technique. Plus, like you said it is a truck, so you have to drive that bitch. Great video..
I’ve been running in L8 and it seems to make a difference. Maybe in my head but L8 down is all I have.
Try L7. L8 (if that’s your top gear) will likely engage DFM when the engine is under a low load and not working hard
What aftermarket Device would you recommend to take care of auto stop and DFM? I know there is the pulsar device but dang 600 bucks is steep. Any other options? I would rather not go to L9
You could try this: Auto Start Stop Eliminator / Bypass GMC Sierra AT4. Full Review and Installation!
ruclips.net/video/FGq25E2fRWU/видео.html
I’d love be to know if my rumble on decel at 25-30mph is DFM, VVT, or torque converter. Does it M7 and M8. 2020 5.3 8-speed. So many systems cause similar problems.
Does the afm activete in trailer mode? If not can we just drive in trailer mode ?
AFM or DFM can activate in all modes except manual mode which is L9 in my case. It operates when the engine is below certain load thresholds. I am not the expert, but if you drive in towing mode, you’re just setting your transmission to hold the gears longer before shifting up. When you go down a hill or coast, AFM/DFM may start engaging until you put more load on the engine.
@@Donslife Thank you
I put 0 miles engine from gm on my 2020 denali and from day 1 has de range technology chip , so we'll see if using 8 cyl all the time improves engine life
How is it working so far?
Thanks for the tip Don! I just put a new Flowmaster muffler on mine with the 5.3 liter and 8 speed tranny. The new exhaust sounds great til it’s in 8th gear, and just cruising around town, then sounds horrible, as it kicks into V4. I tried L7 , and it was magic. In highway driving I just use D
Love it!
I am not comfortable with this new generation of truck's to buy one. I guess you figured it out, I'm old. Give me something problem free and I'll deal with fuel economy.tks for the video. 70 from pa.
my yukon has a corsa driving in L9 the sound is more consistent the only issue is when I drive over 80 i have to shift either back to D or L10 otherwise the rpm will keep increasing
Totally, I do the same and recommend the same. I like it for my for the aftermarket exhaust sound
The only problem with running in Manual mode is the lock up torque converter will not lockup because that is the way its programmed.
Do you notice when in L9 when coming to a stop it has a harsh downshift right before you come to a stop ?
In D, it gives an engine/exhaust surge, but it’s only noise. The feel and shifting is smooth.
In L9 the decel exhaust noise is great, but the last downshift before full stop is noticeable to me. Wondered your experience. Lastly is your column shifter loose feeling when in D. Mine has “slop” up and down.
Thanks Great videos !!
I can confirm my 2020 TB has slop in D, it bounces when I hit a bump! My 2016 never did that
Great Video Don! 2021 GMC Sierra 1500 AT4 with 6.2L with ~39k miles started sputtering with ticking and loss of power (has to be the lifter failure). I was able to limp into the shop. I personally change my oil religiously and the dealer is asking for all receipts to make sure there is no negligence to the motor. I have my own notes of when I changed the oil and some credit card statements showing where I purchased the oil (mobil 1) which I provided. I recently changed the oil 2 months ago and the dealer should be able to see that clean oil is in the system. Like you all, I am a GM guy, having ZL1, ZR1 and my AT4. Hopefully GM does not try to screw me over from a warranty claim. Any thoughts on how to defend my position of not neglecting my engine? Your thoughts are greatly appreciated.
I think the burden of proof is on them if your records tell the story of regular maintenance
We are about to receive our 2023 1500 Sierra 6.2/10 speed. Though we are not happy about the DFM. Thank you for the follow-up video. Your truck sounds so good. I'm sure you did a video on your after-market exhaust, I'll look for it in your playlist. Was curious what you had installed. Thanks again ✌️out.
Nice 👍🏼 Here is the video : BORLA S-Type Cat Back Dual Exhaust Install Review 2019 - 2021 GMC Sierra Chevy Silverado 6.2L
ruclips.net/video/lzjipXNF1UM/видео.html
I have a 2015 Chevy silverado.the number 4 cylinder went on it and the cost to replace it was 4 thousand dollars.i love it delete in my truck it runs way better then it did
I have a 23 Escalade and you have a DFM delete module for your truck but do you have one for Mrs. Donslife truck and if so were did you purchase it from
I don’t have a DFM disabler for either vehicle. We can shift to L9 and it works fine. As for which to buy, Pulsar LT is the most compatible with 6.2’s and the 10 speed transmission.
So do you just drive around in L9 regardless of speed, or do you shift through all the manual gears?
L9 all the time, no shifting at all. The only time I shift back to Drive is if I am going to be on the highway for a road trip. Around the city, 100% L9
What about driving in sport mode it kicks into lower gear? Does that help to disable activate fuel management. I feel that it runs better in sport mode.
Unfortunately no, it will still engage, but likely just less cylinders will deactivate in sport
At also works in a 6 speed tranny. I use the 5th gear when driving on back roads and around town. I actually gained fuel mileage on back roads doing that. The DFM never engaged.
My new 2025 yukon gives option to go all the way to L10.... maybe GM sees the demand for the last gear
Mine goes to L10 too, but DFM will be operational again. L1-L9 = no DFM
@Donslife at L10 DFM kicks back in?
Correct. L10 is equivalent to being in regular Drive (D)
8 speed trans is the same L1-L7 no DFM. L8 DFM is active
@Donslife Thanks for the information.
I been driving on L10 thinking no DFM, cuz Auto start stop doesn't function when on L10. I guess I will try L9 and see if I feel any differences.
I have found and plan to purchase a 2014 Silverado High Country with the 6.2L. Is manual mode available (L5 on the 6-speed) and, if so, is a separate AFM/DFM disabler necessary? Thanks.
Manual mode will work in L5 to disable DFM. You do not need to purchase another device unless you want DFM disabled when in L6 or Drive.
Chevy 2007 5.3 with 94k miles has excess oil consumption (1 qt per 900miles) Some theory is AFM may be partial to blame,,, as well as the valve cover oil passages being the prominent issue. What are your thoughts on AFM in relation to oil consumption? TIA, Keith
my 2017 50th Anniversary 2SS Camaro doesn't work this way. I have an 8 speed, and in manual mode, if I am in "M7" if my RPM's drop to a certain point when cruising it will actually still drop to V4 mode. I ordered a RANGE disabler... Now, I will say that if I leave it in an even lower gear it will mostly stay in V8 mode, but not just 1 gear down. at 55 - 60 MPH I have been running in about 5th gear or so, which is a higher rev (around 2800 RPM etc) and it will stay in V8 mode.
How do I turn off the DFM/AFM in my 2016 GMC Sierra 6 speed? I do not have "L" option on the shifter. Does anyone know?
Shift to M5
@@Donslife great! Thank you... Just tried it and the thing feels like I actually have a V-8 finally.
It sucks that this long-known problem is a daily concern for us. GM should be ashamed and be forced to fix this established problem
When I shift into L it shifts to the next lower gear that it was in D in. If I'm in 10 it will shift to L9
If lifter already failed and been driving for a bit too long should I replace enginev
A mechanic should be able to determine how much damage has been done
Great review 👏 👌
Thanks 🙏🏻
Have u guys had to fix your steering wheel controls?
I haven’t since I didn’t end up getting a Pulsar LT. However a small group of users claim to have various electrical bugs with power steps, blind spot monitoring and more
As a long time mechanic I disagree that disabling the DFM system won't help with reliability. The collapsible lifters have a release pin that when activated, allows the lifter to go into collapse mode. Just like anything mechanical, the more times those parts are activated, the more wear you will have on those parts to eventually cause a failure point. If the system is disabled full time you are far less likely that those lock pins will wear. Also, each time those parts are activated and then deactivated is a chance that they will not function correctly. Take away those chances are your failure percentage is much improved.
As far as fuel economy, I don't have experience with GM but some experience with a Ram Hemi, MDS system (same concept as GM). The Ram I had actually seemed to get better fuel economy on the highway with the system disabled. I noticed that on sharper hills, the delay time of the MDS system deactivating actually caused the engine to need to 'recover' speed. Not so when deactivated manually. In city driving, the MDS seemed to help economy a bit.
I agree with you. I have to be mindful of how I phrase things on RUclips. Someone might claim ‘you promised this would or wouldn’t happen’ and cause some unnecessary drama.
not sure if i missed the detail but does this only apply to certain years? im looking to pick up a 2007 yukon denali 6.2 in a few days, is this manual mode bypass going to be a thing for me ?
I believe it started with 2007-2013, 2014-2018) as AFM (4cyl mode) and DFM later. At least for the Sierra’s.
You can use manual mode or purchase a inexpensive AFM disable device in your case
What about the backpressure exhaust valve? I heard I can turn it counterclockwise and put a #8 bolt through it so it stays open. Will that hurt anything? Also about disabling the Dynamic Fuel Management system, can I have it tuned and disable that way?
Yeah I'm do for my first free oil change so I'm going to let the dealer look at it. My first thought was bad gas also. I put Lucas fuel treatment in it and new fuel no change. Just wondering if you had the issue before.
Let me know if they find something
@@Donslife will do