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6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance 1992-00 6.5L Turbo Diesel - Welcome to the Internet's first discussion forum for the 6.5L diesel engine. Tips on performance, upgrades, cooling, fuel economy, troubleshooting and more.

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  #1  
Old 02-27-2020, 08:15 PM
howlinwolf howlinwolf is online now
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Default What have I done...

Hey, newbie here, and new to this engine. I purchased a 1996 gmc k3500 with 220k miles. seems mostly ok.
things ive noticed wrong with it


slightly hard to start after sitting
stumble/die at times
gauge cluster is a mess (no tach, voltage gauge or check engine light)


other than that and the codes, it seems alright.


codes are
p0113 iac high input
p0216 injector/injection timing control circuit
p0251 injection pump fuel metering control "a"
p1810
p1860
p1870


but i like to learn and dont mind time behind the wrench
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Old 02-28-2020, 09:28 AM
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Hello and welcome to TDP

Clear all the codes.

MAKE SURE THE BATTERY CONNECTIONS AND VOLTAGE TO THE MAIN BUS ARE 14 VOLTS OPERATING.

See what codes come back.
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  #3  
Old 02-28-2020, 09:44 AM
howlinwolf howlinwolf is online now
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Ill start with that. Thanks! I noticed its locked out overdrive, but that goes with the 1800 codes
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Old 02-29-2020, 08:09 AM
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Also might check and clean all your ground connections. On my 94 first thing I did was use spay cleaner on weather pac connectors and add dielectric grease to them. Never had an electrical problem for all the time I owned it 96/2013
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Old 03-01-2020, 08:44 PM
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Cracked the crossover tube the other day, while making the repair, noticed a harness rubbing on the front driveshaft.

Repaired the broken wire and tied it out of the way.


Only code now is a p0216
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Old 04-24-2020, 02:09 PM
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On the p0216 code, I've replaced the stepper motor.

Still here and hard to start.

The timing is showing a requested 8.6? But only getting 2.6 to 4 4 or so
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Old 04-24-2020, 02:36 PM
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The IP is probably indexed out of range. Loosen, rotate, tighten. A little at a time. Timing can only be PCM adjusted within a narrow range.
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Old 04-24-2020, 06:45 PM
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I could scream. The tensioner socket is broken. I can't drop the belt to pull the a/c and reach the pump bolts. But it looks as if the pump has been replaced.

More tomorrow I guess
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Old 04-24-2020, 07:57 PM
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You can use a socket to rotate the tensioner by the pulley bolt.
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Old 04-25-2020, 05:25 PM
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I have loosened the pump, but the housing wont turn
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Old 04-25-2020, 07:48 PM
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It's fairly rigid if you don't loosen the injector lines at the other end. It is recommended, but not specifically necessary if only moving a couple degrees. There's also (should be) a gasket between the IP flange and timing cover that can be sticky.
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Old 04-29-2020, 06:38 PM
howlinwolf howlinwolf is online now
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I figured out the pump movement part. Now I seem to have a fuel leak. It's near the front. Injector lines are tight.

My tractor guy, based off my explanation thinks its an internal weep or o ring failed on a plug
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Old 05-21-2020, 08:13 PM
howlinwolf howlinwolf is online now
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housing cracked. new pump. ran fantastic for a few days. started her up, made it to the end of the block and it sounded like it ran out of fuel (its not. tank is full, filled 5 miles before home, and fuel guage works properly.) lift pump does need replaced (5 psi) but is moving fuel, rebled filter and lines. not getting fuel at injectors. Double checked fuel cutoff solenoid for operation, and fuel at that point, all good. unplugged optical sensor, still no fuel at injectors. at this point, my frustrations won and I went in for the night. sorry to the neighbor whos house its parked in front of.
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Old 05-21-2020, 09:43 PM
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Unless you have another reason to replace the lift pump, 5 PSI is fine. Check it again at idle, when you can. 4 PSI+ is all that's needed. A failed lift pump may fail to start, but shouldn't cause a stall. The IP has an internal transfer pump, and will continue to flow fuel if the LP fails (power may suffer, but it will run).

Maybe revisit the PMD and/or harness. Check fuses. It sounds more electric/electronic than mechanical.
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