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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 11-06-2015, 03:22 PM   #1 (permalink)
lghall
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Help $5k deep, 2 shops tagged out and still no love

I tried to start a new thread. Hope it's ok that I post here. I've got a 98 K2500 Sub with fuel problems. For simplification, I'll start from the back and go forward to describe what's been done.

- New tank (old one rusted)
- New sending unit and sock (lots of slime)
- Plenty of algae killer
- fuel return line replaced
- fuel line to filter replaced
- lift pump replaced, good voltage
- fuel filter replaced
- "last ditch" screen replaced
- OPS and fuel pump relay replaced
- fuel pressure installed at T-valve and run into cab for easy viewing
-Pressure primes to 6-7 psi
-idle fuel pressure is 3.8-4 psi
-fuel pressure at 3,000 rpm is 2.5-2.8
- PMD replaced and #9 resister used (relo already done to front air dam)
- IP replaced (new)

Problems:
- Drove great for 400 miles, then left me stranded.
- P0231 code
- tested PMD cable red B wire. Comes from Fuel Solenoid should sit at 5V and surge to 20V square wave (I am using a fluke rms meter). I'm getting the 5V but no surge.
- Idles smooth as silk, but stutters like it did when it let me stranded if I rev to 3,000 rms.
- White smoke at start up (70 F day). Goes away when warm. Comes back at rev to 3,000 rpms.

I'd like to drive it, but in Northern Virginia (DC traffic) it's not good to often be stranded in a 5,000 pound rock. I'm not even getting a good "limp home" ability when stranded.

I need the truck and don't have funds to replace it. Any thoughts? 2 shops have given up on me so far. I'll also take recommendations on a Virginia shop to fix it.

Larry

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Old 11-06-2015, 06:40 PM   #2 (permalink)
Diaric
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Larry

I moved your post out on its own to get more attention

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well to make your pump retarded, you could let it hang out with me for a day
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Diaric wins thread derailment......
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Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
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Old 11-06-2015, 07:43 PM   #3 (permalink)
lghall
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Thanks
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Old 11-06-2015, 07:45 PM   #4 (permalink)
Glagulator
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Welcome. Can you hold the RPM's at a steady 2000 in park?
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96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine harness, PMD to bumper...
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Old 11-06-2015, 07:52 PM   #5 (permalink)
Freddyack
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Quote:
Originally Posted by lghall View Post
I tried to start a new thread. Hope it's ok that I post here. I've got a 98 K2500 Sub with fuel problems. For simplification, I'll start from the back and go forward to describe what's been done.

- New tank (old one rusted)
- New sending unit and sock (lots of slime)
- Plenty of algae killer
- fuel return line replaced
- fuel line to filter replaced
- lift pump replaced, good voltage
- fuel filter replaced
- "last ditch" screen replaced
- OPS and fuel pump relay replaced
- fuel pressure installed at T-valve and run into cab for easy viewing
-Pressure primes to 6-7 psi
-idle fuel pressure is 3.8-4 psi
-fuel pressure at 3,000 rpm is 2.5-2.8
- PMD replaced and #9 resister used (relo already done to front air dam)
- IP replaced (new)

Problems:
- Drove great for 400 miles, then left me stranded.
- P0231 code
- tested PMD cable red B wire. Comes from Fuel Solenoid should sit at 5V and surge to 20V square wave (I am using a fluke rms meter). I'm getting the 5V but no surge.
- Idles smooth as silk, but stutters like it did when it let me stranded if I rev to 3,000 rms.
- White smoke at start up (70 F day). Goes away when warm. Comes back at rev to 3,000 rpms.

I'd like to drive it, but in Northern Virginia (DC traffic) it's not good to often be stranded in a 5,000 pound rock. I'm not even getting a good "limp home" ability when stranded.

I need the truck and don't have funds to replace it. Any thoughts? 2 shops have given up on me so far. I'll also take recommendations on a Virginia shop to fix it.

Larry
Couple of thoughts:

1. Fuel Pressure Gauge: T valve fuel pressure readings are not accurate. The sender for the fuel pressure gauge needs to be between the fuel filter manager and the IP.

2. P0231 is Fuel Pump Feedback Circuit Low Voltage. Here is the 1998 DTC Diagnostic section from the 1998 C/K Truck Manual to help troubleshoot this code: https://www.dieselplace.com/forum/63-...ml#post7236242. This is a .pdf file that will download to your PC.

3. White smoke at high RPM indicate bad injectors if the smoke smells like unburned diesel. If you had algae, etc in the fuel system, could be plugging the IP inlet filter screen and/or one or more injectors
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Old 11-06-2015, 08:05 PM   #6 (permalink)
lghall
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Thank you, Freddyack. This looks like what I need. I've got some homework to do.
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Old 11-06-2015, 08:12 PM   #7 (permalink)
lghall
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Glagulator, I'm responding on my cell and thought I answered you. However, I don't see my post.
I have held it at 2000 rpm. It still stutters slightly, but not as bad as at 3000 rpm.
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Old 11-06-2015, 08:33 PM   #8 (permalink)
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Hope this helps some way. I'm a do it yourself kind of guy and I had a 4 runner that would start to studder and buck, blow smoke and die randomly. I couldn't figure out what was wrong and after Alot of money and time I took it to a mechanic. Turned out to be a temp sensor. It would malfunction and I guess didn't know if it was - 20 or 100 degrees and start dumping fuel in. It wouldn't throw a code, and I couldn't find out what symptoms it had because it ran fine every other time it wasn't trying to throw me through the window. Sometimes I could ride the clutch and get it to stay running long enough to get off of downtown Houston highways and it would just shudder until it died. Give it 30 minutes and it was good to go. Good luck, gremlins suck.
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Old 11-06-2015, 08:41 PM   #9 (permalink)
Spollock818
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Know this must of been done but fuel filter?
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Old 11-06-2015, 09:52 PM   #10 (permalink)
grabowski
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My '94 K2500 'burb is 8300lbs+. How did you get yours to 5000lbs?

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