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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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Old 01-29-2007, 12:33 PM   #1 (permalink)
rbr1317
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Can't get rid of code 88.

I need some help or point me in the right direction on what could be the problem. I have been having a problem in that we can not get the truck timed because the inability to clear a Code 88. This has been this way for at least 6 months. Well now the IP failed (irratic throttle, run away a couple of times at full throttle) and I figured that this has been the problem all along. So I ordered a brand new pump, installed it and I now get codes 34 and 88. When cold it starts like a flooded gasser.. chug, chug, chug, lots of white smoke but eventually clears up. It runs "ok" but not great.
Few things to mention:
  • It has been starting hard for a few months. It has been getting progressively worse since last spring. It used to be now and then starting hard but lately it is every day.
  • The SES light comes on at about 2000 rpm and stays on until you shut it off.
  • After clearing the codes the Code 88 immediately comes back without the truck even running. (cleared with paper clip - simultaneously depressing the brake and accelerator pedals )
I do not have a scanner to set the timing or even know where it is set at. I would imagine the timing is out and causing the 34 (maybe). I will be going to Heath and have him set it. My concern is that I can not clear the code 88 prior to even trying to have the timing set.

What would cause a code 88 without even having the engine running?

Thanks for any help.

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Rob

2008 GMC 2500HD SLT, Crew Cab, Short Box, 6.6L Duramax/Allison.
Ext: Deep Blue
Int: Ebony Leather
EFI Live with DSP 5 switch - Idaho Rob tunes
stock,30,60,90,valet
4" MBRP DP back
Corsa muffler


Previous truck: 1995 GMC K2500 X-Cab., L56, 113,000miles, "F" Intake, Boost and EGT Guages, Heath Max-E-Tork, Heath Turbo Master, SSDiesel PMD w/heatsink and #9 resistor mounted behind air dam on frame, 97 Cooling/D-Max fan, Banks 3.5" exhaust/no CAT, K&N in original box, Us Gear Dual Range underdrive, 3.42 gears (~ 4.10's in underdrive).
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Old 01-29-2007, 01:08 PM   #2 (permalink)
kena
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When you set the timing, the code 88 will go away.
.

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1994 K2500 6.5TD F ...........1995 Mercedes E300D
5-Speed 4x4 GN Hitch.........2002 Dodge 1500 SLT
PMD behind License Plate....2005 Montana Tractor
5521 IP 185,000 miles.........5740 57hp 16x16 FEL
Heath Max-E-Tork Chip
Heath TurboMaster
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Old 01-29-2007, 01:15 PM   #3 (permalink)
gmctd
 
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Let Bill look at it - he'll know what to do, in any event.
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Old 01-29-2007, 06:36 PM   #4 (permalink)
THEFERMANATOR
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Code 88 is because your timing is not set.

code 88= TDCO error(no TDC offset is in ECM memory or it is grossly wrong)
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Old 01-29-2007, 06:58 PM   #5 (permalink)
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To clarify this, get the timing set and your good to go.
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Old 02-10-2007, 09:27 PM   #6 (permalink)
rbr1317
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Well Bill could not time my truck because he couldn't get rid of the code 88. He said my pump was turned too much towards the drivers side - more than normal - for it to run half way decent. He thought it must be that my CAM key was haf sheared. So this weekend I tore into it and this is what I found. Half sheared cam key like he said... I thought I would share incase someone else has timing issues like mine.
Attached Images
File Type: jpg cam-key.jpg (70.9 KB, 792 views)
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Rob

2008 GMC 2500HD SLT, Crew Cab, Short Box, 6.6L Duramax/Allison.
Ext: Deep Blue
Int: Ebony Leather
EFI Live with DSP 5 switch - Idaho Rob tunes
stock,30,60,90,valet
4" MBRP DP back
Corsa muffler


Previous truck: 1995 GMC K2500 X-Cab., L56, 113,000miles, "F" Intake, Boost and EGT Guages, Heath Max-E-Tork, Heath Turbo Master, SSDiesel PMD w/heatsink and #9 resistor mounted behind air dam on frame, 97 Cooling/D-Max fan, Banks 3.5" exhaust/no CAT, K&N in original box, Us Gear Dual Range underdrive, 3.42 gears (~ 4.10's in underdrive).
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Old 02-10-2007, 10:17 PM   #7 (permalink)
gmctd
 
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Informative post, Rob - demonstrates importance of visual input in diagnosis

Thanks for the update.
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