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LLY GM Duramax Discussion of the 2nd Generation Duramax and Gm truck

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Old 09-02-2021, 05:59 AM   #21
Jaysz28

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Quote:
Originally Posted by weazel View Post
It’s flip flopped on the duramaxes, 1 is pass side, 2 is drivers side..
That is a serious debate regarding our LLY shop truck/tow pig

it needs an injector, but the owner/boss disagrees with the intrawebs on its location......

our old tow pigs were all 5.9 cummins, so easier to diagnose.
 
Old 09-02-2021, 06:01 AM   #22
ikeG
 
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Quote:
Originally Posted by Jaysz28 View Post
That is a serious debate regarding our LLY shop truck/tow pig



it needs an injector, but the owner/boss disagrees with the intrawebs on its location......



our old tow pigs were all 5.9 cummins, so easier to diagnose.
Sounds like you might get paid to do it twice

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Old 09-03-2021, 06:09 AM   #23
Jaysz28

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Originally Posted by ikeG View Post
Sounds like you might get paid to do it twice

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hell, I don't even want to do it the first time!

Its a Chevy Kodiak 4500 - and you have to lift the body!
 
Old 09-03-2021, 07:14 AM   #24
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hell, I don't even want to do it the first time!

Its a Chevy Kodiak 4500 - and you have to lift the body!
No you don't! Take the dog box out, inner fender shields, and even the hood.

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Old 09-04-2021, 03:43 AM   #25
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Check the wiring harness on the bracket at the top of the FICM. They like to ground out there.

Do You have an idea how long ago that injector or connector were replaced?
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I don't think they let hair sniffer twit much. Or the little gay guy. Only the Indian does.
 
Old 09-04-2021, 08:50 PM   #26
GreasemonkeyHd

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Originally Posted by smokinVE View Post
Check the wiring harness on the bracket at the top of the FICM. They like to ground out there.

Do You have an idea how long ago that injector or connector were replaced?
no idea but I replaced #5 today and little no difference. I have checked the wires on that bracket and can't find any bare wires. It goes like this every time I start it, I've done this numerous times. Can't even get it to run up to full operating temp. I fire it up and it misfires on onecylinder very bad and smokes raw fuel smoke. Balance rate reading high on 4 and 5 no cel light or codes. About 10 minutes in it will start to hit on the dead cylinder on and off. After 15 minutes it will run smooth and smoke almost completely gone. Then give it a few revs and it sounds good, a few more minutes go by give it another Rev or two then tractor mode and either 1,6, or 8 injector control circuit codes. Only one code at a time

Last edited by GreasemonkeyHd; 09-04-2021 at 09:18 PM.
 
Old 09-06-2021, 01:23 PM   #27
GreasemonkeyHd

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Borrowed a solus

Borrowed a solus scanner from a friend and did a cylinder contribution test and got these codes after it went into limp mode
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File Type: jpg 20210905_122313.jpg (274.6 KB, 0 views)
 
Old 09-07-2021, 08:01 PM   #28
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Try moving the wiring when it’s running “okay” to see if you can find a common area. I’d guess you’ll find the issue right at the top of the FICM or behind the generator.

It rare but low compression can cause it and I’ve seen a few relucter wheels cause it (but in both those cases it should be more or less all the time. It’s even more rare but the FICM can short internally, mostly rust belt units and or guys that like to steam clean their engines often.

Good luck
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Old 09-13-2021, 07:16 AM   #29
GreasemonkeyHd

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Quote:
Originally Posted by smokinVE View Post
Try moving the wiring when it’s running “okay” to see if you can find a common area. I’d guess you’ll find the issue right at the top of the FICM or behind the generator.

It rare but low compression can cause it and I’ve seen a few relucter wheels cause it (but in both those cases it should be more or less all the time. It’s even more rare but the FICM can short internally, mostly rust belt units and or guys that like to steam clean their engines often.

Good luck
Ive tried wiggling the wiring everywhere every which way and can't get it to kick into limp mode when it's running good. I don't think this truck was cleaned very much. Suspecting 1 maybe 2 injectors now. But I have no way to check compression. The truck is 100 percent bone stock so I can't really see a mechanical issue
 
Old 09-13-2021, 11:09 PM   #30
GreasemonkeyHd

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Found outbthe #7 injector hold down bolt is broke off in the cylinder head although that cylinder wasn't reading a high balance rate
 
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