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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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  • 1 Post By Tr00b
  • 1 Post By ak diesel drive
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Old 07-09-2019, 11:18 PM   #1 (permalink)
Tr00b
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Anyone had this happen before?

Hot start moving the truck around the yard. Running totally fine before. Sat for maybe a couple of minutes.

Truck starts but runs extremely rough, shakes badly will not respond to throttle input at all, service engine light stays on.

Turn off ignition. Start truck again. Runs fine. Service engine soon light no longer lit.

Did it twice today, so obviously something is up. All I can think of is the fuel shutoff solenoid sticking partially closed.

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1996 GMC K1500xcab 6.5 3.73 4L80E rear bags Bought at 99k 12/13 now 138k 9/17
Repairs:
BWD OPS 1/14 Heath PMD kit 3/14 Airtex boost solenoid 6/14 Lube Specialist cooler lines and cooler, rad support mounts, Pro Comp ES9000 Shocks, rear brakes 7/14 Interstate Batts, Cooper AT3 tires, Hummer H3 rims, stepper motor 4x4, coolant flush 11/14 Stabilizer bar links, soot trap gasket 9/15 Dorman tank, sending unit/sock delete, filler neck, filler neck, hose, Leroy's Tank Barbs, SAE30R9 lines, WIX filter head and prefilter with brackets by paleyjim, intake manifold gaskets 3/16 Used transmission, dipstick tube, fluid flush, drain plug pan by paleyjim, power steering fluid flush, transfer case seals and fluid 9/16 Duraterms 11/16 Ball Joints and wheel bearing drivers side. Powerstop pads, lubed sliders 4/17 AD244, Leroy's Flight Systems PMD 9/17
Performance:
Ashland Muffler 2.5 X-over 12/13 FTB FFM by paleyjim, ported upper egr delete S-code, lower F-code, ported IP fitting, FASS DRP-02 lift pump 3/16 Transgo Shift Kit by paleyjim, Energy Susp. engine+trans mounts 9/16 Ported GM8, Diamond Eye, Quadstar tune 11/16 K47 Box, Glowshift 3-1 1/17 Leroy's Billet Crank pulley, Fluidampr. 9/17
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Old 07-10-2019, 11:47 AM   #2 (permalink)
ak diesel drive
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my guess would be CPS/OS. Unfortunately the intermittent nature makes it hard to troubleshoot. Codes?

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Old 07-10-2019, 01:07 PM   #3 (permalink)
OkDually
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My guess would be PMD and or harness with a loose pin or worn through wires.
The clue is loss of throttle response.
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
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Old 07-10-2019, 01:57 PM   #4 (permalink)
JMJNet
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The Suburban Club Member

So what is the DTC?
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Old 07-10-2019, 03:34 PM   #5 (permalink)
Tr00b
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I don't know what the DTC is, it goes away as soon as you shut off/restart.

Another possibility is that the OPS is bad. FASS lift pumps do not have a flow on fail valve. I didn't look at my fuel pressure when this happened but I'm assuming it would be zero if it wasn't working. I replaced the OPS a few years ago but it's been funky the whole time. Possible that it is experiencing impending failure.

Happened to be at paleyjim's house cleaning up storm blown down trees, and he noticed that my lift pump didn't run before I cranked it the first time I experienced it.

The DRPS are loud. Can hear them for a few feet. He didn't think anything about it until I told him the truck did it again.
__________________
1996 GMC K1500xcab 6.5 3.73 4L80E rear bags Bought at 99k 12/13 now 138k 9/17
Repairs:
BWD OPS 1/14 Heath PMD kit 3/14 Airtex boost solenoid 6/14 Lube Specialist cooler lines and cooler, rad support mounts, Pro Comp ES9000 Shocks, rear brakes 7/14 Interstate Batts, Cooper AT3 tires, Hummer H3 rims, stepper motor 4x4, coolant flush 11/14 Stabilizer bar links, soot trap gasket 9/15 Dorman tank, sending unit/sock delete, filler neck, filler neck, hose, Leroy's Tank Barbs, SAE30R9 lines, WIX filter head and prefilter with brackets by paleyjim, intake manifold gaskets 3/16 Used transmission, dipstick tube, fluid flush, drain plug pan by paleyjim, power steering fluid flush, transfer case seals and fluid 9/16 Duraterms 11/16 Ball Joints and wheel bearing drivers side. Powerstop pads, lubed sliders 4/17 AD244, Leroy's Flight Systems PMD 9/17
Performance:
Ashland Muffler 2.5 X-over 12/13 FTB FFM by paleyjim, ported upper egr delete S-code, lower F-code, ported IP fitting, FASS DRP-02 lift pump 3/16 Transgo Shift Kit by paleyjim, Energy Susp. engine+trans mounts 9/16 Ported GM8, Diamond Eye, Quadstar tune 11/16 K47 Box, Glowshift 3-1 1/17 Leroy's Billet Crank pulley, Fluidampr. 9/17
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Old 07-11-2019, 11:15 AM   #6 (permalink)
Tr00b
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Now it's sitting in a puddle of diesel leaking from the tank area. Have to pull the bed for the leaf springs anyway...
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1996 GMC K1500xcab 6.5 3.73 4L80E rear bags Bought at 99k 12/13 now 138k 9/17
Repairs:
BWD OPS 1/14 Heath PMD kit 3/14 Airtex boost solenoid 6/14 Lube Specialist cooler lines and cooler, rad support mounts, Pro Comp ES9000 Shocks, rear brakes 7/14 Interstate Batts, Cooper AT3 tires, Hummer H3 rims, stepper motor 4x4, coolant flush 11/14 Stabilizer bar links, soot trap gasket 9/15 Dorman tank, sending unit/sock delete, filler neck, filler neck, hose, Leroy's Tank Barbs, SAE30R9 lines, WIX filter head and prefilter with brackets by paleyjim, intake manifold gaskets 3/16 Used transmission, dipstick tube, fluid flush, drain plug pan by paleyjim, power steering fluid flush, transfer case seals and fluid 9/16 Duraterms 11/16 Ball Joints and wheel bearing drivers side. Powerstop pads, lubed sliders 4/17 AD244, Leroy's Flight Systems PMD 9/17
Performance:
Ashland Muffler 2.5 X-over 12/13 FTB FFM by paleyjim, ported upper egr delete S-code, lower F-code, ported IP fitting, FASS DRP-02 lift pump 3/16 Transgo Shift Kit by paleyjim, Energy Susp. engine+trans mounts 9/16 Ported GM8, Diamond Eye, Quadstar tune 11/16 K47 Box, Glowshift 3-1 1/17 Leroy's Billet Crank pulley, Fluidampr. 9/17
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Old Today, 11:47 AM   #7 (permalink)
Tr00b
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The Dorman tank failed after roughly 10k miles and 3 years outside of the warranty. Must have had a dimple in the die that made a pinhole that the biodiesel found for me. The tank is leaking from bright clean paint on the bottom. Busy pulling the bed for a new tank, some 2500 leaf springs.
__________________
1996 GMC K1500xcab 6.5 3.73 4L80E rear bags Bought at 99k 12/13 now 138k 9/17
Repairs:
BWD OPS 1/14 Heath PMD kit 3/14 Airtex boost solenoid 6/14 Lube Specialist cooler lines and cooler, rad support mounts, Pro Comp ES9000 Shocks, rear brakes 7/14 Interstate Batts, Cooper AT3 tires, Hummer H3 rims, stepper motor 4x4, coolant flush 11/14 Stabilizer bar links, soot trap gasket 9/15 Dorman tank, sending unit/sock delete, filler neck, filler neck, hose, Leroy's Tank Barbs, SAE30R9 lines, WIX filter head and prefilter with brackets by paleyjim, intake manifold gaskets 3/16 Used transmission, dipstick tube, fluid flush, drain plug pan by paleyjim, power steering fluid flush, transfer case seals and fluid 9/16 Duraterms 11/16 Ball Joints and wheel bearing drivers side. Powerstop pads, lubed sliders 4/17 AD244, Leroy's Flight Systems PMD 9/17
Performance:
Ashland Muffler 2.5 X-over 12/13 FTB FFM by paleyjim, ported upper egr delete S-code, lower F-code, ported IP fitting, FASS DRP-02 lift pump 3/16 Transgo Shift Kit by paleyjim, Energy Susp. engine+trans mounts 9/16 Ported GM8, Diamond Eye, Quadstar tune 11/16 K47 Box, Glowshift 3-1 1/17 Leroy's Billet Crank pulley, Fluidampr. 9/17
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Old Today, 09:13 PM   #8 (permalink)
jnlperformance
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What about historic codes? It should be stored...
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