stalling

PatrickgWhite · July 3, 2005

my '98 chev. 6.5 randomly stalls. sometimes it is fine and other times it will just keep shutting down. it use to be now and then when i'm driving slow and the truck is warm, but its now done it on the highway. its also acted like it was going to stall when its just started in the morning the odd time.

when took it into the dealership for this problem last time they said nothing was wrong b/c it started up, ran and drove like normal, but if they drove it for a day it would just start randomly stalling later on.

does anyone have any idea what might be wrong?

tsalazar7 · July 6, 2005

my '98 chev. 6.5 randomly stalls. sometimes it is fine and other times it will just keep shutting down. it use to be now and then when i'm driving slow and the truck is warm, but its now done it on the highway. its also acted like it was going to stall when its just started in the morning the odd time.

when took it into the dealership for this problem last time they said nothing was wrong b/c it started up, ran and drove like normal, but if they drove it for a day it would just start randomly stalling later on.

does anyone have any idea what might be wrong?

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The most likely cause is the Pump Module Driver (PMD). This is the little black box on the side of the injector pump. Replacing the PMD is not hard. Remove the four screws that hold it in place and install the new one. The hard part is getting to the PMD. You must remove the intake to gain access to the driver. There are after market drivers with longer harness' that allow you to mount the driver in more accessible areas but I highly recommend staying with GM parts(actually the parts are Standyne). If it's something you feel up to the challenge to tackle, then don't forget one thing. When installing the new PMD you must remove a resistor ,from the old PMD, which is located where the harness plugs in to. Use a pick or snap ring pliers to get it out. Install it into the new PMD. You must use this same resistor. It is unique to your injector pump. If you forget it, your truck will start but it will have all kinds of driveability problems. Hope this helps you.

16gaSxS · July 7, 2005

my '98 chev. 6.5 randomly stalls. sometimes it is fine and other times it will just keep shutting down. it use to be now and then when i'm driving slow and the truck is warm, but its now done it on the highway. its also acted like it was going to stall when its just started in the morning the odd time.

when took it into the dealership for this problem last time they said nothing was wrong b/c it started up, ran and drove like normal, but if they drove it for a day it would just start randomly stalling later on.

does anyone have any idea what might be wrong?

<{POST_SNAPBACK}>

The stall is IP related it is cover by GM for 120,000 miles or 11 year which ever you reach first. I had one pump replaced at 28,000 by GM for this, I replace the PMD/FSD (Fuel solenoid Driver is the PMD when you relocate it.) Some dealer are real........jerks about replace them, most of the time it's out of their incompence. Try another dealer or if that's the dealer you bought the truck from raise a stink about it. GM sent all owners a letter with the policy. The letter is part of the referce section on The Diesel Page. TDP cost $25 year to be a member and I been there since 1996 and has saved me a couple thousand dollars.

After the extened warrentee expired on my truck the PMD crapped out at 136,000 miles so I put a FSD Cooler on that mounts in the engine compartment that lasted about 30,000 miles. Then I chaged that out with a Heath PMD Issolator kit which is mounted out of the engine compartment. The nice thing about the Heath set up is He backs it for 7 years, so if the darn thing takes a dump again Heath will replace it.

The gist of the problem is that the Drive has 2 500 watt transitors in it and they cook in the engine compartment, once you start getting the stalling it will get worse, if dies take some water and pour it on the PMD if it starts up right away odds are that the problem. The crummy thing is that many times it won't set a trouble code which the dealers want to see to replace it. If your under the 120,000 miles fight it out with the dealer, I'd take the truck to the dealer lock the doors with it running and then let the Service manger drive it so it stalls on him. This is BIG problem and if they have any 6.5's out there they know it.