GM 5.3 Low Cylinder Contribution - Failed Injector
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- Опубликовано: 12 янв 2025
- Come Along with Eric O. as he has a look at this 2005 Chevrolet 1500 5.3 that has a symptom of low cylinder contribution. Not a dead miss but a "slight miss". Gathered some surprising evidence when we scoped the fuel injector to get a waveform.
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Your diagnostic mastery is the main reason I watch your channel. The depth of knowledge, though process, diagnostic steps, evidence gathering, and failure confirmation you display all motivate and inspire me to improve my own troubleshooting. Keep it up and most of all thanks for taking the time to make these videos and for sharing your knowledge with the rest of us!
yes! absolutely agree!
Baxrok2 very well said and same for me. I'm a heavy truck mechanic and I apply Eric's techniques to my diag strategy. Again, thank you Mr O for making these videos.
a tip : watch series on kaldrostream. I've been using them for watching lots of of movies these days.
@Crew River Yea, been using kaldroStream for since november myself :)
@Crew River yup, been watching on kaldrostream for since november myself =)
Since I'm trying to gain knowledge in the diagnostics side of auto repair these type videos are my favorite. I just bought a used Vantage so I am taking the next step in my learning process. You, Ivan and Paul have been a lot of help so I appreciate your help.
I recently bought a used Vantage Pro myself. I chose the Vantage mainly because Ivan recommended it. Although I've only used it once so far to diagnose a temperature sensor, I love knowing that I have it. Two channels and the component info is a confidence builder for sure.
That's great. I hope it helps you in the future too. I'll be going to scannerdanner's premium channel to watch his videos on the Vantage. I believe there is about 8 hours of lessons just on this one tool.
I've watched the ScannerDanner series on the Vantage Pro. It's all classroom discussion and it certainly helps with familiarization.
Keep the diagnostic videos coming. They are my favorite and really teach the technical side of things.
I keep a few fuel injector filters on hand for some injector "failures". A simple drywall screw is used to extract the filter and I have a modified plastic syringe to do a quick cleaning process to the injector while it's out of the vehicle. When it comes to shorted or open injectors, a replacement is the only option.
I just uploaded a full shop tour on my channel and I would be honored if you stopped by to take a look.
Thanks for sharing your experience with us!
Eric - You asked if anybody had seen a bad injector on a 5.3. I have a 2004 Silverado with a 5.3 and it had a misfire under load that turned out to be #4. I swapped the #2 and #4 coils because I was sure that it was a coil problem. #4 still misfired, so disconnected the #4 injector and measured 12.8 ohms of resistance. I then felt the injector to see that the seals were tight and felt something odd on the backside. So, took the fuel rail off and pulled the injector and the backside of the coil portion of the case had split.
So, put in a new injector and misfire under load was gone...
good info.
How could someone give this a thumbs down? Great video as always!
Probably some jackass who would rather "fire the ol' parts cannon at it" instead of taking time to "test, not guess".
Someone with a miserable life, just sharing their misery.
Roll the diagnostic dice and fire the parts cannon hahaha thanks for the laughs Eric! Sweet waveforms on the Verus and verification of Ohm's law :)
Hey Ivan
I look so forward to watching you and Eric. You guys are great. Can't wait to meet the both of you.
My 2002 Avalanche with a 5.3 VIN Z has never lost an injector even after 463,000 miles. Love your channel Eric. Too bad you are not in Texas!
Oh man way to hot for me there!
Lol "I just got jabbed by my probe". Dude you are a genius. Went threw this same diag and found my CYL#3 injector has faulted. Thanks for the help
Diagnostics is the reason I watch your videos, don't listen to the complainers
Thumbs up for running 2 current ramps on the same channel !! Never thought of that sweet
I actually HAVE had only one case where I diagnosed a bad injector. On and off it would fail. Started checking injectors after I cleared the ignition with a clean bill of health. I wanna say it was Cylinder #5. Caught it with it's pants down! Had driver control, no voltage kick and no current (total failure when hot) while using my trusty Modis Ultra. Great video man, thanks for the share. Love the diag cases you post! Keep it up and have a gret day!
Another great video. I'm usually troubleshooting non-car things but your videos are always good thinkers for the diagnostic process. The fundamentals are pretty universal and cars are a great mix of electrical, electronic, mechanical, thermal, and chemical.
I love your diagnostic videos. Please keep em coming.
Diagnosis are my most favorite videos. I like the way you describe what should be happening and what is wrong on the wave forms. Can tell you’ve been at it long enough to know what you are looking for. Your setting a good standard for others to follow. For sure my most favorite videos are the diagnostic videos
Reading the comments it sounds like idle roughness is just built into these 5.3's. I've got a bit of idle roughness on my 2002 GMC Sierra 5.3L with 53K miles. No MIL, no stored or history codes, and it's very slight, almost imperceptible. I see no misfires on the misfire counters, no fuel trim issues, everything seems to be working like it's supposed to but there's definitely an erratic miss, just ever so slight. I did clean the TB which definitely needed cleaning but it didn't help. I suppose I could ohm out the injectors but I doubt it's anything hard failed like this, though. Great vid!
I love the diagnostic & Check Engine vids, Eric, and have watched every one you have. Thanks for taking the time and keep 'em coming!
Check if yours has an EGR valve or just a blocking plate. It seems to eliminate the EGR they advance the exaust timing , which cause a lopping.
No EGR on mine. There's no blocking plate where the EGR usually goes on the 5.3. It's missing everything related to the EGR. Maybe that's it.
+johnaclark1 maybe to to clean your fuel injectors
Our 04 GMC Yukon XL has over 200k. It still has its factory injectors and coils. Plugs and wires have been changed once. Runs fantastic, great motors. I've never even seen the check engine light on in that vehicle, and yes, it works, cause I pay attention to the bulb check on startup.
I was very surprised you had a bad injector. I have been doing this for over 18 years and have not seen a bad injector on one of these yet. Its usually always ignition related or a Mechanical issue like lifters or valves not sealing properly. Good find for sure
Great video as always. In the last 11 years of having my own shop, also in truck country with lots of chevys. I can only recall encountering 2 different trucks with a bad injector. 1 was a Tahoe and the other was a 1500. Both were 5.3 Z engines. It was back before I got handy with my scope. I used injector balance test and resistance to diagnose them. If I’d started watching you and scannerdanner sooner, I would’ve been able to diagnose them faster. Thanks to your videos, my scope stays pretty busy these days. Thank you.👍
Keep up the in depth current and voltage waveform diagnostics! The amount of information you can gather, both precise and relative is fantastic.
Well I just had an '07 2500HD w/6.0L with the same issue, granted this truck was rough, but cyl 6 miss. 2 busted plugs and 6 of 8 wires broke on removal.... went ahead and played swaptronics with the coils from 6 and 2, still had the miss on 6... injector 6 was shorted @ 4.5ohm.
I don't have a scope yet so had to just use the DMM but the result of the diagnosis was the same. great video on how to diagnose properly!
Lots of valuable information here, if one listens. I loved your remarks about proving the diagnosis! Electrically the diagnosis seems easy, though I am struggling when it comes to nozzle issues. More like this, please.
Man I feel honored to have a guy like you watching my simple vids! Thanks Man! I have no where near the education you have in this stuff.
In all fairness, that's not true, I'm just a guy who has an interest. Salt of the earth guys like you, with loads of experience in the trenches every day, have it over humble amateurs like me, any day.
spelunkerd Are you kidding me? Don't you have degrees in electrical engineering and such? Come on man I hardly hold a high school diploma!
I may have spent decades in school, but anybody knows that the important things in life are learned on the ground, only rarely in the classroom. Thanks for posting these videos, it's a great channel.
spelunkerd Well thanks and it still means a lot to me coming from you!
My 02 avalanche with 290k miles has the same symptoms but no ce light. About 6 months ago it was doing it and threw p0306. I changed the #6 coil and all the wires. (plugs have about 100k miles on them) It seemed to get better for a while, no more cel but now the symptons are back. I am just waiting, hoping the light will come on so I can be directed but after watching the video, I may try the ohm test on the injectors. Thanks for the video, perfect timing for me.
This video came at a great time. Got a 03 Trailblazer with the 5.3 with a P0300 that pops up only when I go on a my annual summer vacation. This gives me something to check. Much appreciate the great details!
I am in awe of your physics and electronics knowledge. Most mechanics wouldn't know Ohms law if it smacked them up side the head.
South Main Auto Repair
If I ever had to take any of my cars to a mechanic, I'd take them to you. You are a true technician, unlike the opinionated "dark glasses guy who yells a lot"
Well done Eric... Patience is a virtue.
Have never replaced an injector fitted to any of the engines, granted we don't see a ton of them here... Most common for us would be a late 90's toyota - years ago.
I'd still fire plugs and wires at it, unless 'recently' done or they have a low threshold for pain:)
I think most people like SMA for the variety. Interesting diagnostics and all sorts of repairs as well. Some channels do one or the other. Not many do both.
Eric, Hey man love all videos they are great you do a wonderful job on repairs. I've been a Automotive Tech for 14 year and have not come across one Chevy with a 4.8,5.3,6.0,6.2 that has a dead, or injector not working yet lol thanks man keep up the good work.
Bravo......Bravo sir. Have never seen that. And for that matter only seen one bad ignition coil ever on the fellas. Running strangely off of bank 2 only with blown fuse for bank 1 coils. Actually found cyl. 1 coil melted to the metal coil bracket. So strange and never seen another ever again so far.
I just fix cars for family and I always enjoy learning as much as I can about testing electrical components. Also like to here your thought process as you take us through the diag.
Nice job, Eric. Never seen a bad injector on one of those but many bad o2 sensors. Had one with a sticking lifter that drove me crazy.
Whoa, crazy find! I've never personally seen a Multec 2 fail like that; normally they just get a bit gummed up, sticky or clogged, and a good cleaning (OFF the vehicle!) gets 'em back to normal.
My folks have owned a 2002 GMC Yukon Denali (6.0L) since new, and with close to 170,000 miles on it, it's still chuggin' along. It hasn't been without its problems, but aside from routine maintenance, the engine has never given my folks any trouble. I'll be treating it to a full gasket set in the next month or two, and after that, I have full confidence in it making its usual journey between Los Angeles, CA and Vancouver, Canada and back when it needs to.
That was an excellent diagnosis Eric. This was also great video, thank you for posting these with all the scope information, I really like it.
Never changed an injector on one of these. Normally it's the Knock sensors, harness and coils on these baby's. New one for me. Very cool to see that wave form.
Nice work Eric!! My roommate has an 07 Tahoe 5.3 that had injector # 2 go bad. I went through swapping the coil with #6 no change. Plugs were good. Had him take it to his friends shop told them exactly what I had done and to put an injector in. Problem solved. The mechanic was shocked that I got that far with the diagnosis. No scope I hope to have one in the future!
I wish I had your diagnosis skills man I've been a heavy line guy and could only wish to be this good
I've had 2 injectors on this engine with flow issues. Never seen a shorted one on this engine though. awesome scope capture and as always very clear explanation in the video. thanks for the great video.
I have a very similar problem with my Chevy 5.3.
Great video , looking forward to meeting you guys next Saturday in Ohio !
great find Eric never seen an injector short out on those motors I've seen them plug up from the back side .I would do an injector balance test and make sure they all flow to within a pound to a pound and a half of psi .I've also seen them throw a false p0300 and a cam crank pattern learn took care of that keep up the honest and good work
An even faster test for a dead injector is to take a long flat-blade screwdriver and put the tip on the injector body and put your ear on the end of the handle. You can hear the injector pintle moving. Sounds sort of like a ticking sound. You should do a couple on the same motor to get the average sound of them and any that are acting up are immediately obvious.
Pretty much liked you using the Verus for the waveforms and the autel for the pids. Great ad usual Eric.
Of all the videos you do, I think I enjoy the Diagnostics videos the very most. Keep it up Eric.
Hi Eric
I think I might have grabbed a rod from Mrs O anf Gone fishng (LOL) you already new what the problem was. I like the diagnostics. I have done enough of the nuts and bolts and still enjoy it, but I really like knowing that the repair actually shuld fix the problem. Do it once and do it right.
Keep up the good work and let's see hat new Puppy of yours again to see how big he/she is getting.
I'll admit to changing or swapping an injector on a misfiring cylinder without a thorough diagnosis. Working in a scrapyard, it was easy to grab an injector. As others have said, unless you work on these on a daily basis, the cost of the tools, and more importantly, access to wiring diagrams and data, like the correct resistance values is difficult to justify. Any other product you purchase comes with a wiring diagram. Washing machines, air conditioners, dishwashers, heaters etc all come with wiring diagrams. Motor vehicles should come with wiring diagrams specific to the vehicle or the manufacturer should have a website where the owner or a mechanic can get free access to them by entering the serial number. I can get that information about almost everything online but somehow, auto manufacturers have gotten away with charging for that. You must spend quite a bit monthly on the services we've seen you get information from.
honestly Eric, I can count on 1 hand the number of Gas injectors I have replaced, not counting multitech or GM spider injectors,never seen issues with injectors in Georgia, diesels are another story, fyi I prefer the diag videos over the nut and bolt stuff☺
Yeah same here. Like I say I think a lot of them get changed on a guess but real failures I think are not that common. However there is a "GM Tech" a few comments up that is changing them like we change oil and says they fail all the time.
South Main Auto Repair I worked at a shop that worked mostly on fleet trucks never saw an injector replaced on a 5.3, I can do the water pump or intake gasket blind folded on 5.3s, also worked with an ex gm dealer tech he never mentioned injector problems either
I do like that the “parts cannon” is never fired. Diagnostic skills are a constant process due to the ever evolving world of electronics wizardry
Keep these diagnostic videos coming! After 25 years of not wrenching and now back at it due to the Great Recession how else can I get the knowledge? Yeah, I would be more comfortable working on a slant six that needed plugs, points, and a condenser but those days are over.
Seppa, in the same boat as you. Left the trade professionally in 1995 and am now back at it due to other circumstances. Unless you do it everyday for a living, the technology can pass you by quickly even though I've tried to keep current. Best of luck to you
This is a very helpful video. I have 2005 GMC YUKON with the 5.3, and I and seeing a Lean report on the Bank 2 Downstream O2 but only after running at idle for a few minutes. A MAF replacement corrected the ST and LT Fuel Trim numbers, but I think I may still have one or more fuel injectors with a lower flow rate at idle speed conditions.
Good video very clear and concise. Eric you have probably done this but if not could you do a comparison of the Autel and Verus. I'd like to know how much the Verus can do that the Autel can't. I could justify a Autel but not a Verus.
Good stuff. Love the diagnosing stuff as you take us on the journey. Thanks!
Awesome channel with great case studies,there's plenty to learn out of.
working in a dealer dude, i've never seen one eathor, but anything is possible, i have replaced injectors for people getting shit fuel.
but i love these videos because i get to know my verdict more and more
People will whine about anything. If the video helps just one person facing this problem, the video is worth the effort
O.M.G a labelled fuss cover with numbers and words and everything !!!!
Great video thank you. I don't get many misfires in the shop but I'll sure be ready for when they do roll in.
Nice video & shorted injector waveform. I've don't remember having a 5.3 shorted injector...had a few open injectors (aftermarket), clogged injectors & one by bug (customer left the rail on garage floor), few that ohmmed higher than spec aftermarket injectors but weren't misfiring & balance checked good had funky waveforms but you know how aftermarket injectors are. Shoulder surgery Monday can't wait so I can get healed so I'll kick back & watch you, Ivan, Jim, Paul, James' work.
I've never seen this on a gen 4 Chevy v8. But i have seen this on a few older lexus/toyota v6 engines. I want to say late 90s, don't remember the exact years.
Close up & go be with your Family, Eric. Repairs and RUclips videos can wait.
Great video. One thing I wish is that you show how you connect the equipment in detail.
Thanks for the video, I've got a 04 Silverado with recent misfire #6 cyl also. I'll be checking ohm's today.
No codes yet but I have a 06 vin Z L59 Sierra that does the shake shake shake when it wants to at idle. Its been doing for probably 70,000 miles. I would imagine the injectors are all dirty on it from lack of a fuel filter. Thanks GM! I don't think the plastic body injectors that these have can be cleaned well? I dunno, Who believes what they read on the internet.
Nice work. Thanks for posting. Do remember to go fishing with your family though. Some of my best memories are fishing with my kids.
All of the fishing videos are on my other channel.
I would love to see a tune up vid on this truck. :)
Good vid and good diagnostic process. Thanks for sharing and I always learn something from you. Keep up the good work.
diagnostic videos are the one that i like the most, keep it up!!!
seen those fuel lines rust internally anf send rust into injector screens causing misfire from lack of flow. Fixed by r and r lines and clean fuel rail and injectors
Give me more diagnostic video Mr owe. Bring it on boy. Great as ever
Eric, another top drawer video!!!
Very good thorough job again, good work.
another great video. your diagnostic skills are very impressive.
A great vid for sure and good use of your equipment I would have liked to see the old vantage put to work on this just to show what can be done on the cheep bet of luck friend
I have encountered a bad injector on a 01 Silverado. My problem was extended crank time. The classic loss of fuel pressure a short time after key off. In my diagnostic process i pulled the fuel rail with injectors and had the wife turn the key on. I watched the injector spray. I went ahead and replaced the fuel filter out of caution and popped in a known good injector out of my old truck I still had.
I also was not expecting a bad injector, but wanted to eliminate other possibilities before replacing the pump which the previous owner had already replaced for other reasons. He sold the truck because he thought the pump was bad and didn't want to replace it again.
nice diagnostics work Eric.
I have personally replaced 2 injectors on 2 different 6.0 chevys. 05 cadillac escalade 6.0. had a misfire more pronounced when warm but very random. hooked up fuel pressure guage and did a fuel injector Balance test with scan tool. Number 1 injector flowed 4 psi less then the others. also a 03 Savana 3500 6.0 preformed same test to find no injector flow on #4 at all. switched #4 and #6 injector pigtail and #6 worked with #4 control harness. ohm check didn't help here
Great diagnostic video Eric.
awesome waveform, great teaching....
I had one about a month ago we Rebuilt trans and then had a bad b2 sensor 2 same as your dead no voltage. We had a horrible miss on cyl 6 but had good readings with verus scoping etc. I about had determined it had a bad valve but we went ahead and threw an 02 sensor at it and Walla no more misfire still haven't figured out how a bad 02 was causing only cyl 6 to misfire and this was kinda like this video got worse as it warmed up. great video as well.
great video! watch out for injectors in New di ls engines, seeing them fail sub 30k.
I have that same Jeep hat. I got it in 1997 when I worked for Jeep.
It's always good around here!
Eric I have had a 2004 5.3 with 178000 on it and with no issue, I know have a 2008 5.3 72000 no issues.
Great trucks
Excellent video. Great content
The best in the business! :D
same everything as that but had all new injectors from another shop, came to me as the miss came back, #1 was bad again plus the plug was filed and injector was shorted out
Great scope capture. Thanks Eric o
Great job troubleshooting sir
I am new to your channel and I am impressed big time! You have a cool head and have a ton of great need to know information. I feel like an apprentice of yours, camera work is perfect. You have built a channel to reinforce understanding and the need to know what your dealing with. I am very thankful for the help this channel has given me. Would you be able to send me info for the purchase of your shop logo t shirts ?
I just wonder about your comment about my issue regarding a particular misfire for cylinder 2 for the 2017 Kia Optima Hybrid ( the bad thing is the injector plugs are not accessible without removing the intake manifold. Followings are what I did so far: 1. Cylinder Compression tests are done and all-around 180 for Kıa Optima Hybrid. 2- Cylinder Leakage tests are done with no head gasket issue. All leakages in %2 to % 4 for all cylinders. 3 - All spark plugs end Coils were replaced with OEM ones. 4. I tested ınjector 2 because there was a P0202 error and I also tested it outside of the car. I installed a new injector too. P0202 is removed, But still, I have a misfire error. The cables look good from the outside there is no damage but I am guessing maybe a broken injector ruined the ECU injector transistor. The worst thing is the problem does not occur permanently, it comes randomly. I use Autel IM508 to test while driving as well. Missfire counts randomly and I feel the rough driving. I also have Cat P0430 error according to the error. When I see this error I also thought maybe the injector working fine but ignition coil firing has the issue. I eliminate many things, now I am thinking 3 reasons: Injector cable harness, Ignition cable harness (it is not separate and I have to replace all engine harnesses), Faulty ECU.
great videos always very thorough
Don't be surprised at a shorted fuel injector coil. Putting any coil over the top of a hot engine for a prolonged period of time is not a good idea. My surprise is that they work as good as they do for so long. Like you said, it was an older truck. Keep making You Tubes videos. You do a great job and I really enjoy them.
Oh I am surprised at a bad injector coil because we just don't see them short that often. A lot of injectors get swapped out when people guess but how many do you actually see (and prove) bad.
FYI, I'm in Australia, and have the '17 Holden Caprice, which has the LS3. 97,000km on the clock, and THREE injectors have failed so far, and I think a 4th is on the way out too. (misfire codes on #6). Usually, I get both a misfire code, AND an "injector circuit fault" code, however so far, #6 is only reporting misfire. Dealer said it's a reasonably common problem at the moment, on high usage vehicles such as mine (I'm a limo driver), and police vehicles etc. They also say the coils are going *high* impedance, not low, like yours.
i had a 2500 hd before having my verus with scope and had exact same fish bite miss, ended up being a bad/clogged injector im not sure. Found it when i moved it to another cylinder and the misfire moved. sadly i didn't have a scope and do not remember if i checked the resistance of it but replacing the 1 injector did fix the truck
-zach
How do you like the alltel maxisys scanner . How does it communicate with the vehicle ? I have the Verus.
Also have you used a system called ProScan.?
I like all of the videos you do
Another good one Professor O!,,
great video. love the diag videos
Have replaced 2 failed injectors in the new 5.3 Silverado- one each truck under warranty. Both were shorted. Much harder to get to on the new engine... damn engineers
My wife bought a brand new 2015 Silverado, 5000 miles and the injectors went bad twice. After the 2nd time the tech said it was a catastrophic failure, too much fuel dumped in the cylinder.
Great vid mate, keep them coming.