GM 5. 3 Low Cylinder Contribution - Failed Injector
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Date: 2020-08-05
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Comments and reviews: 10
Robert
I know you probably wont see this since its 3 years old but I actually had it happen the other day I works for a bus / car fleet we have e450s with 5. 4 and chevy caprices with the 6. 0 and the 3. 6 so the 6. 0 had a cylinder 2 misfire co worker of mine did tune up still had the mis changed the coil I came back from working in one of our other shops a week later re confirmed the mis on cy 2 checked out the data found my fuel trims were high went to ignition coil just to double check its firing correctly with my scope then went to the after the injector with the scope it wasn't till I found the shorted coil that the injector wasn't opening causing the high fuel trims I've been trying to break out the scope more this is my second diag performed with strictly scope but because of guys like you scanner danner and the wells videos I'm starting to pick up on things it's not the most perfect training source but it's getting me places thanks for the videos yall really help people who cant get to a real hands on scope class
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I know you probably wont see this since its 3 years old but I actually had it happen the other day I works for a bus / car fleet we have e450s with 5. 4 and chevy caprices with the 6. 0 and the 3. 6 so the 6. 0 had a cylinder 2 misfire co worker of mine did tune up still had the mis changed the coil I came back from working in one of our other shops a week later re confirmed the mis on cy 2 checked out the data found my fuel trims were high went to ignition coil just to double check its firing correctly with my scope then went to the after the injector with the scope it wasn't till I found the shorted coil that the injector wasn't opening causing the high fuel trims I've been trying to break out the scope more this is my second diag performed with strictly scope but because of guys like you scanner danner and the wells videos I'm starting to pick up on things it's not the most perfect training source but it's getting me places thanks for the videos yall really help people who cant get to a real hands on scope class
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Tired
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.
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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.
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Greg
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.
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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.
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Nicks
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 Id started watching you and scannerdanner sooner, I wouldve been able to diagnose them faster. Thanks to your videos, my scope stays pretty busy these days. Thank you.
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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 Id started watching you and scannerdanner sooner, I wouldve been able to diagnose them faster. Thanks to your videos, my scope stays pretty busy these days. Thank you.
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TheAussieonvanisle
Interesting that you comment about people replace injectors without proving it, seems to be the norm more often than not. I had the same model come to me after injectors had previously been replaced but the rear injectors on both sides failed again. Turns out there was sediment in the rails and yup, they slope down toward the back. apparently the owner thought the fuel filter was life time because they were steel not plastic lol.
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Interesting that you comment about people replace injectors without proving it, seems to be the norm more often than not. I had the same model come to me after injectors had previously been replaced but the rear injectors on both sides failed again. Turns out there was sediment in the rails and yup, they slope down toward the back. apparently the owner thought the fuel filter was life time because they were steel not plastic lol.
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GNX157
Definitely would of advised the plugs and wires, as well as fluid change in the diffs, transfer case and transmission, based on that mileage. Although rare, I would of at least discussed replacing all injectors, if only because they fail so rarely, but whatever this injector was exposed to, so were the others, as well as probably being manufactured at the same time and maybe there was something going on in the manufacturing at the time.
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Definitely would of advised the plugs and wires, as well as fluid change in the diffs, transfer case and transmission, based on that mileage. Although rare, I would of at least discussed replacing all injectors, if only because they fail so rarely, but whatever this injector was exposed to, so were the others, as well as probably being manufactured at the same time and maybe there was something going on in the manufacturing at the time.
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Gt403cyl
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!
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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!
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Jason
Yooo Eric O, I'm looking at an 07 5. 3 with a P0300. I'm just a newbie in school but I got my hands on a Solus Edge this weekend only! Fixed an exhaust manifold leak and pcv hose leak which helped quiet her down a bit. Still random misfire. Plugs and wires are newer and test good. Clean maf/throttle body. Solid fuel pressure. Intake doesn't seem to have a leak. Any advice for this Solus Edge? Thank you so much
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Yooo Eric O, I'm looking at an 07 5. 3 with a P0300. I'm just a newbie in school but I got my hands on a Solus Edge this weekend only! Fixed an exhaust manifold leak and pcv hose leak which helped quiet her down a bit. Still random misfire. Plugs and wires are newer and test good. Clean maf/throttle body. Solid fuel pressure. Intake doesn't seem to have a leak. Any advice for this Solus Edge? Thank you so much
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Willie
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 youve 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
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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 youve 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
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CB
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.
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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.
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