Question: 2005 LLY cutting out, stalling intermittently. - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 08-05-2019, 03:28 PM   #1 (permalink)
pj951
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2005 LLY cutting out, stalling intermittently.

The truck: 2005 GMC Sierra 2wd 540,000 miles

The problem:

Beginning about a year/40,000 miles ago, it occasionally cut out at random intervals. The truck was never entirely disabled, it always got me home sometimes bucking severely. It happened at freeway speeds, sometimes driving off from a traffic light. No codes set, ever. After replacement of the fuel filter housing and the two rubber hoses. I thought it was fixed.

The bucking and stalling came back a few months ago. No codes. Since then I've replaced or checked:

Checked trigger wheel bolts for crank sensor. Appeared tight.

Replaced fuel pick up module in tank. Cleaned tank (it was clean anyway). Changed fuel filter multiple times. Checked lines from tank, no visible leakage. Ran good for 500 miles after that.

Replaced FPR (Bosch), 2 attached rubber hoses (GM parts), one fuel hose close by and thermostats. Idled great and ran great for about 10 miles then started bucking and stalling. Again, no codes set.

I'm suspecting an air leak somewhere still.

Questions: Does this sound like a CP3 failure? Or a FICM?

Any ideas or advice appreciated. Love my truck, not ready to give it up.


Peter J.

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Old 08-07-2019, 10:16 AM   #2 (permalink)
MyShibby65TD
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How were the codes scanned? 2005 is the last year for J1850 and not all code readers properly read the pending codes.


You should also get a reader that can show you the fuel pressure, turbo vane positions, boost, etc. to get a good idea of what the FICM is demanding.

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2005 LLY 3500 CC/LB SRW 4x4 208,000 miles
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SOLD 1993 6.5L TD K2500, EC/LB, 4x4, Auto, 252,000 miles
4" DE, trans cooler & 8AN lines, 10AN oil cooler lines, nylon fuel lines, AD244, LB7 fan, Medallion marine injectors, OPS relay, glow plug override, OPS override
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Old 08-07-2019, 11:56 AM   #3 (permalink)
pj951
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Yes, noticed that. I have a Mac (Bosch) hand held scanner and access to a Matco Maximus (Launch). The Bosch freeze frame showed my foot bouncing off the gas pedal when the motor cut out once..but the actual rail pressure and commanded pressure seemed to track perfectly during the trip. The Maximus didn't reveal anything pending. Maybe I need a Tech 2 or something.

I'm going to run a direct fuel line from the tank to the filter housing and see if anything changes. At least it starts and runs.
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Old 08-12-2019, 12:01 AM   #4 (permalink)
pj951
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Update: The 'ol truck is running great.



The aftermarket bleeder screw seems to have been causing an air leak. I installed it last year with the replacement filter housing. My guess is the vertical cut in the threads gradually shredded the O ring as filter changes happened. The vertical cut in the threads also provided a convenient channel for air to leak.. Today I installed a much better looking replacement bleeder screw that is a Dirty Diesel product. It has a bleed hole drilled in the threads instead of a vertical cut. Truck runs great. Time will tell if this is the fix.


Honestly I never even looked at this unusual bleeder screw before I installed it last year. My bad.



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