Thanksgiving DURAMAX -BONUS Part 3! (Limp Home P0088)
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- Опубликовано: 11 сен 2024
- In the art of diagnostics, when dealing with multiple problems, the question always is "ARE THESE PROBLEMS RELATED"?
In Parts 1 and 2 we took care of the malfunctioning PRNDL display, and then a poor battery terminal causing an intermittent no-crank situation.
Part 1: • DURAMAX Thanksgiving S...
Part 2: • DURAMAX Thanksgiving S...
However, the last customer complaint of a "P0088 - Fuel Pressure Too High -Limp Home" was only reproduced once before the initial repairs.
Now that the other issues are sorted out, I want to take a deeper dive on the P0088 and try to recreate the exact conditions for setting the code, with detailed data graphing using the Snap-On Verus. Keep in mind that an aftermarket PPE Lift Pump is installed on this truck:
www.thoroughbr...
The findings are very interesting!
Enjoy!
Ivan
Your skills and tenacity are undervalued. You deserve more subscribers, well done.
Thank you for the positive feedback :)
agreed
I've learned a lot by watching Ivan and Dr. O at SMA. Extremely skilled and very high ethical standards too! Keep it up Ivan
Thank you for the kind words!
@@PineHollowAutoDiagnostics True words well earned 🙂
I was watching an RV channel the other day where they had issues with a circuit, and they started to test for just voltage (which was fine), but the second they put a large bulb in the circuit it failed. First thought that came to my mind was "Huh - Ivan and Erik both use test bulbs for just that reason!". Kudos to both gentlemen for being so willing to not only show us, but explain WHY as well.
I couldn't agree more. I watch them fix stuff I never see.... But if and when.... I'll already have some !ind of an idea what to look for.
Rubber mounting grommets might help quiet that pump.
That's one mighty fine pump installation. Come on Ivan we want a video of you mounting the pump RIGHT!!! Finish the Job. Ha!
Ivan, you do make absolutely outstandingly educational and entertaining videos. Each one is a real gem.
I wish you were in the UK.
Thank you for your motivation Pete!
Neighbour: whats that truck goin thar with all of them dials and hises hangin of en the mirrar?
Other neighbour: Aw thats just that Russian repair feller.😎👍
Loved hearing you use the term “give her the bean”! Eric O’ would be proud! Lol
Teflon tape on that adjusting screw. Good Video series.
Ivan it's a good thing you have that driveway!!!
Also great for finding squeaks and rattles with all the potholes ;)
I thought the bonus footage would be about securing the adjustment screw. I am nervous about the adjustment screw backing out with vibration. May need an o-ring replaced to stop leak.
I made sure it would stay put with some superglue and duct tape haha
I assumed u would not leave that screw like that! Good work.
I have an 03 LB7 Duramax. I installed a fass lift pump with the filter and water separator. The pressure was about 13psi and I was getting p0089 every few weeks. Changed the fuel pressure regulator spring (in the lift pump), lowered pressure to 7psi and it’s been fine for 3 months now. These fuel systems don’t like a lot of pressure.
Great case study for sure!! Keep up the great work! I always learn something watching your videos. I never thought I would know so much about genie lifts haha!
Yup sounds like the exact same case here!!
You are just driven to get it right, aren't you, Ivan? That's why you are getting more followers. Great detective work.
That was a great Thanksgiving diagnostic treat. Well done Ivan. Thanks!
Wow! A bad ground, oil leaking on a connection, and an aftermarket fuel pump attached to the diesel gets adjusted to fix several transmission error codes with an intermittent stall. Without you Ivan this truck would have been in the junk yard or would have had an unnecessary transmission job with a newly rebuilt diesel injector pump. You fixed it for a fraction of what another shop would have charged. When you do the several part series I have to tune in so I learn so much.
Thank you, glad you enjoyed the adventure! 3 separate issues, almost no parts required :)
if i remember on correctly on common rail there is no good way to relieve that high pressure without causing problems so they regulate the low side very fastly to adjust the high side output. that auxilliary pump basically puts more on than the relief can handle in a coasting situation.
Yep the "balance" has gone.
Would a pressure relief valve work...an electronic one?
Take that pump off and replace the pickup pump in the tank. No more problems or leaks.
There is no pickup pump in the tank lol
@@PineHollowAutoDiagnostics I always thought that ever car diesel or petrol had a in tank pump why did GM use just use a injector pump system there's a reason why every other car has a lift pump or in tank pump
@@PineHollowAutoDiagnostics but there had to be a factory solution to this rather than adding in an aftermarket pump. I think that's where richard was going with that comment. Seems like removing the aftermarket crap would have solved this assuming there was a factory replacement.
Possibly that the injection pump is worn out. Plugged fuel filters can also be to blame.
@@mitchheine6878 if it were me I would check it before the filter and arfter the filter
Nice to have that adjustment. I hope it doesn't leak.
Huge Kudos to you Ivan for going above and beyond because you as a mechanic weren't satisfied with a reading and did the research to see that there were adjustments available that did indeed ease the problems.
Is that aftermarket pump making all that noise? I don't think I would tolerate that.
My neighbor had a diesel pickup woke me up every morning. He traded that noisy, sticking thing for a gasoline truck thank goodness!
You always amaze me. Now get some sleep now. Lol 😂
IVAN, thank you for all the information you sharing as always u r AWESOME in my book learn allot from you through all those years been watching and from SMA CHANNEL MR ERIC O. CHEEEERS
Quoting Steve "You're Awesome".... Some may have missed when Ivan AND Eric did some stuff TOGETHER.
@@HouseCallAutoRepair Yegh a fight broke out, only kidding they got on well as a team.✔
Tovarishch - great job on the diagnosis.
Spasibo!
Ivan, I love your OCD when it comes to making sure the problem is solved. I have been bite before assuming I fixed a problem only to show up at retest. "Go to Ivan when you want it fix for sure."
Great video Ivan. This truck is just like me give a little food and it goes and goes.
Wonderful job with this truck. I learned alot from your diagnosis. I like the way you methodically attack the problem until it is fixed.
If the truck has a CP3 injection pump, there is a serviceable (replaceable) pressure control valve called the Cascade/Overflow Valve (Bosch PN: F00N200798) that screws into the side of CP3
injection pump that regulates lubrication to internal parts of the injection pump and also regulates the fuel pressure to the fuel control solenoid valve. It also controls the amount of fuel returning to the tank which in turn helps control rail pressure. 15 psi is not to much feed pressure, Cascade/Overflow Valve is probably bad. Read up on it.
Very interesting!
good job, you fixed it how i had hoped you would.
Quite a picky system, i guess you put a zip tie and packing around the regulator, pesky adjustment screw :-D.
Hey Ivan, you better put some lock tite around the outside threads of that adjustment screw so it won't back out all the way and leak. They make a formulation just for outside threads. It's almost like krazy glue but easier to remove in case you have to make adjustments. Just a suggestion.
Yup I put a dab of superglue and some tape to keep that screw in place :)
The suction side of derv pumps usually have a solenoid on them (IMV or inlet metering valve) PWM controlled ground. The IMV is fully open koeo thats no control to it. Activating the soleniod lowers the intake of derv by closing the IMV so lowers the fuel rail pressure. In theory unplugging the IMV while running should give full all out FRP! That's how most negative pressure derv pumps work over here in UK Some IMV are backwards though, IE fully closed when no power to them. Just food for thought Ivan
That vibration, that screw is going to come out
He said he was going to set it. probably some misses' nail varnish doesn't matter what color but hard setting. _"Sweetheart could I borrow your make up bag to fix the Duramax!"_
@@tomctutor funny
It would be nice to put a chunk of car tire between pump & frame.
Big hose clamp against screw groove to hold.
What a problem child that thing was! Multiple issues. Nice work battling them all, one by one, Ivan. Hope you, Amanda, and the pup had a fantastic Thanksgiving! 👍👍🍻
We sure did! Thank you for the kind words :)
Bonus footage to the bonus footage, uuuurah! Great job. Dot of silicone or torque stripe would probably secure that adjustment screw.
Nice job Ivan.
So, for Thanksgiving, you got a turkey and two more days
of leftovers. It's really a DIRTYMAX without the stuffing!!!
Wow. Ivan. That was awesome Thanksgiving fix! I am so glad you didnt give up on that nagging problem! So simple to adjuat that to keep the pressure within spec! Aweaome video! Love the bonus footage! Now all 100% fixed! Many many thumbs up, ivan!
Thanks Josh!! Happy Thanksgiving!!!
I love how thorough you are! Most mechanic’s would’ve sent it down the road, after reviewing the data from fixing the ground issue. Great job as always! Now let’s talk about you moving to the Indianapolis area, so I can justify bring my vehicles to you.😉lol
My brother lives there...and he has a Modis scanner haha
Eliminate pump completely and route lines correctly.
I had lift pump problems on 2 different duramax trucks, the concept of them is good but the pumps fail and CAUSE all the problems they are intended to prevent you must bypass the line around them as it will not draw fuel through them adequately ( as the manufacturer claims it will in event of pump failure )
Nice charge exxxtra to put some old inner tube on that rattling pump 🚚😬
Thats awesome Ivan. Most mechanics would've said whats this aftermarket junk pump and removed it. Then replace injection pump for big $$$. Way to save the customer money.
Nice ! To bad you couldn't play around with some power resistors in line with the power feed to control the rpm/pressure of that aftermarket pump. As a added benefit the pump probably would last longer and be a hell of a lot quieter ! I'm just as nuts as you Ivan but dude nice diagnostics and fix ! Hope you and the Mrs. Had a great Thanksgiving ! Take Care !
Thanks for your support Billy! Happy Thanksgiving!
Ivan love your never quit videos can't wait till your next one thanks
My 2005 cp3 started losing adequate low side suction at 200,000 mi below -10 deg F. Installed a Fass boost pump. Solved the problem. Isn't as noisy as that pump. That pump is ridiculously loud.
Some lift pumps also add filtration and water separation. They also can reduce entrained air.
Brilliant job Ivan!!!!
Put a little paint or plumbers epoxy over the exposed adjust screw to hold it in that setting, but allow future adjustment if needed.
I'm sticking to petrol cars.... at least until I'm really used to the Verus.
100% sure, ok SIR IVAN, Get rid of that after market pump & replace the factory pump. That after market pump is going to cause problems. Since the customer wants to use it at the least take the adjustment screw out & put some teflon tape on the threads. I know it's the best you can do if the customer doesn't want too fix it the right way.
Can't even adjust it all the way down with out it leaking, WTF ? JUNK.
I'm not a fan of aftermarket stuff, but in this case the add-on pump seems to work great IF adjusted properly....NO PARTS REQUIRED ;)
might have been able to take it out and cut a coil off the spring
The high pressure pumps are very expensive. Otherwise, there wouldn't be a market for these lift pumps.
Put a switch in the throttle linkage that would turn the pump on when the throttle is open, and shut it off with closed throttle
Interesting suggestion! Only hurdle is to figure how to do that with the fly-by-wire system.
@@PineHollowAutoDiagnostics I'm sure you can figure it out, maybe a pressure switch on the main fuel pressure feed, when it goes down in coast, pump shuts off. Or a switch on the injector pump if there is something there that moves when it feeds fuel. Dream up something!
Or just change the fuelfilter
@@willemstreutgers1154 was going to ask him that did he check the filter
Ivan great job of explaining the reason for a lift pump. I have a new lift pump and was about to install. The diesel boys just say its a must to save my injector pump from failure. I will be installing but now I really now why and set it up per your reasoning...
I think that OE primer pump is good for about 3-5psi. Apparently 9 will work. :) Good series Ivan!
Not to say after the fact but I thought that pump was the issue. Aftermarket parts always seem to be an issue, Especially on GM products.
Sometimes that little extra research pays off. Would be interesting to know using that same gauge test, what the pressure was when the truck was new and no added pump. Either way you're obviously within spec and no check engine light. Nice work.
You do have a talent my friend. Wish you were in northeast Oklahoma
Well done my man.
I was thinking further about the fuel supply issue myself. I was wondering if maybe there is a filter "sock" on the end of the pickup in the tank. If it's restricted, the factory mechanical pump will have a hard time drawing fuel from the tank; and after more than 300,000 miles, the tank has been filled multiple times, increasing the likelihood that foreign matter is in the tank. Also, the thing about the add-on pump is that it serves as a restriction when it isn't running; in other words, the OE pump has to pull fuel through the lines plus the aftermarket electric pump when it's unplugged (so it would cause fuel starvation at that point). I would reason that, if the high-pressure side on the injection pump still works fine, the low side should as well, seeing how Diesel fuel is also an effective lubricant and wear shouldn't be an issue. It may also be as simple as restricted fuel lines or a tank venting issue (like possibly a faulty fuel cap). If it were my vehicle, I'd rule those out first, mainly because I can't stand the sound of that irritating electric pump!
Great informative video. That scanner tool is very nice
Nice fix for a strange fault.
Now I can go to sleep too. Thanks Ivan.
Very, very enjoyable and very good work and diagnostics on your part!... could you use teflon tape to wrap around that set screw on the aftet market fuel pump to stop the fuel leak?
There must be an o-ring in there. It only leaked once the screw was ready to fall out haha
I was waiting for that screw to go flying!
It didn't look like there was any resistance on the adjustment screw, i'd be concerned it would back-out and be leaking diesel all over the road. Maybe some blue locktite on the threads would keep this from happening?
I put a dab of superglue and some duct tape over it haha
If it leaks, that attempt will turn really sticky!
Great job my friend.
Thanks Bill! It was a walk in the park compared to the Astra haha
Alright lets diagnose why it needs the lift pump. The LMM diesel is bad about injectors bypassing. If the original supply pump went out it would trash the piston pump. See how much vac the supply pump can create. Take the noise box out and see if p0087 sets under demand.
If injectors bypass freeze frame failure will show fuel temp around 225F. Lots of fun potential.
Another great repair Ivan 👍
Thanks Ivan, nice follow up. Doing a little research myself I've noticed that quite a few folks have the fuel starvation issue when doing some tuning on the Duramax. I don't think i would want that whining pump noise all the time though ;-)
Yeah apparently it's a common issue on the Dmax. Can't really hear that pump sound over the Turbo whistle :)
Duramaxs are notorious for the stock rubber flex lines sucking shut on the supply side of the injection pump under heavy acceleration. People often replace the injection pump thinking that the suction side is weak. The after market lift pump masks the problem by keeping the lines open since they are no longer subject to suction.
It’s self pumping during coasting may be a damaged actuator o-ring. Actuator or high pressure pump issue. Sometimes a injector can also cause the issue. The high pressure pump is always pumping the actuator control high pressure the electric pump should not cause this issue unless maybe the pressure is above factory with the aftermarket pump
"PSi Bar mmHg, Pa, in" no end of units to confuse you.
Canucks like me love metric
Nice fix but how about the sign "change fuel filter" A clogged/dirty fuel filter will obstruct flow when flooring the throttle. Now solved by using a extra aftermarket fuelpump ?
I replaced it :)
Brilliant! Sneaky NPR Fix!
Love your vids!
Die-sells are why I left the dealerships in 95, my clothes no longer smell of die-sell fuel.
I intentionally spell diesel as "Die-sell" since you should really sell them when they die.
It's the American version of Eurotrash, I would never own one.
I own an older Dodge dually with the V-10, and you would have to kill me to make me get rid of it.
They sure pull nice and get better fuel economy when towing, but when it comes to repairs, break out your wallet $$!
dood you gotta check out bernies new video on the 7.3 litre diesal with low power and knock awesome case study
Yes! Great video by Bernie!
Привет Иван!
Как тебе повезло с регулировочным винтом! Я полагал, придется подбирать клапан регулировки давления.
Но утечка через винт, кажется мне опасной проблемой...
Nice fix Ivan!
Why would someone go through the trouble and expense to put that aftermarket crap pump on instead of replacing whatever factory worn part is needed to fix it right? I like Eric's theory on aftermarket stuff. Nice find on the problem. You don't give up easily.
A new injection pump is $2-3,000. The aftermarket pump was around $200. A lot of people feel there should’ve have been a pump pushing fuel to the injection pump from the start vs. gm’s decision to have the injection pump suck the fuel from the tank.
Isn't sucking fuel instead of pushing it what used to cause vapor lock in the old cars?
@@jeffs2809 that makes sense since that's how gdi engines are doing it. That pump just seems kinda janky.
I had a feeling...
Me too...glad I checked it again haha
Well done Ivan. Perseverance....thorough diagnosis and careful analysis..end result....problem solved. And this time....no "Russian repair." Just good old fashioned education and skill. You da man! A belated Happy Thanksgiving to you and yours...and to your furry pup too. Wonder if you'll have any snow by Christmas?
Thanks for the kind words Paul! Probably no snow this winter again :(
Get rid of that aftermarket junk and put it back to FACTORY.
Edit: if the factory pump can't get enough fuel on its own, I'd check the supply line for vacuum or leaks (sucking in air or a restricted in-tank strainer or fuel filter)
Great man
The thought of drawing fuel from the tank and through the OEM filter just seems like a really bad ides to me. It seems to be the norm with diesels, and supports two or three companies that specialize in making lift pumps.
I'm the same way, loosing sleep over same kinda stuff, Les B has a good idea, ah switch to toggle the pump actuated by the throttle
James Kmenta *losing
Did you change the feul filter and reset the light I bet that might be causing a proplem and if that pump was mounted on rubber mounts it would stop all of that vibration and noise
I would go to PPE’s (pump manufacturer) actual website and check the install instructions for that pump. It says to install a fuel pressure gauge and regulator to operate at 4-8 psi. It says the pump is not user adjustable. They way you adjusted the pump may not be the best way to adjust the pump.
I read that PDF...even though they say it's not adjustable, turns out it is definitely adjustable!
@@PineHollowAutoDiagnostics I would call PPE. They are pretty good with customer service. You might have used that port to adjust it but that may not have been their intention for that port. It did start leaking when you adjusted down. But that’s just me.
Thanks for sharing
Nice.
Question ? How long ago was low side pump installed prior to problem showing up and what changed since then !
Nice job and video
I noticed the change fuel filter on the dash in one of the earlier vids. Was it not cleared or is it a possible problem? Good vid thanks!
I changed it after the other repairs :)
2019 6.7 cummins just installed a cp3 no tune required kit from s&s. Throwing p0088 code. After install desired rail pressure @ idle 5800ish and actual @ idle stayed close. Drove to Indiana from Arkansas am noticed at idle my actual started to creep to 10,000 psi throwing the code now is up to 16,000psi can't figure it out
Привет Иван! Как вариант, поставить более толстое уплотнительное кольцо на винт, чтобы топливо не подтекало.
How the heck does a 15 psi pump cause the pressure to go over 4000 psi?
My question exactly. It apparently has to do with a crappy way of relieving the excess fuel pressure when coming off the throttle. Not sure why a pulse width modulated valve couldn't do the same work and send the fuel back to the tank.
Hi flow low pressure pump or a pressure regulator with return to tank?
Then I finished the clip, good job
Ivan rolling coal
:D
How can i get one of your pine hollow t-Shirts???
Coming soon via Teespring :)
@@PineHollowAutoDiagnostics Great!!! Will be on the lookout!!!
Sweet! Ya know that'll show up in a few videos! (Mine... lol)
I think you broke the bbbind. Website. The free tsb and wiring diagram link on their site doesn't work anymore. Too many hits from youtubers?
My theory is, the manufacturers ganged up on them after BBB's popularity skyrocketed. They want ALL the money. I knew that was going to happen. Manufacturers surf the net just like we do - just a matter of time before they shut it down. Exactly like Napster regarding music. Same thing, only this time Metallica didn't rat them out. :)
What about the warning for replace fuel filter? We trucks at work that fall on their face at full throttle because the pump can’t draw enough through the filter.
I replaced it before delivering it back to the customer :)
@@PineHollowAutoDiagnostics Oh ok. I work on smaller diesel trucks on a minesite. They use crap diesel here and when the filters block they can draw air into the system because the pump suction is high and the restriction is the filter. Thought that may have potentially made a difference.
Loving the channel BTW. 👍
Where are you located?
Did you change the fuel filter and reset the maintenance light for it.
Yup