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Chevrolet 3500 Starts, Runs And Dies

Q. 1998 Chevrolet 3500 cargo van, 350 5.7 Vortex engine, 154,000 miles, automatic transmission. Well, here goes!! The van had been running and stalled out while going down the road. It started back up immediately. Next, I cut it off and it would not start back. Had it towed to the mechanic and he replaced the fuel filter and fuel pump.

Chevrolet 3500 Starts, Runs And Dies

Ran about ½ a day then started stalling and cutting off again. Stopped again and would not start. Had it towed again. After sitting in the shop overnight it started up again and the mechanic could find nothing wrong. Took it back and same thing started again. It stopped again.

Took it to a Chevy dealer and they put it on a machine and said the computer was bad. Went to another Chevy dealer to get the computer replaced and he said let me check and clean the battery terminals first and try that.

It worked long enough to get a block away from the dealer. Took it back and they replaced the computer. Two days later it was stalling again. Then I thought maybe it was a bad fuel pump that was put on so had the fuel pump changed again. This time he also changed the fuel pump module.

It still stalled out and would not start at all. Had it towed to another Chevy dealer. They replaced the ignition cylinder and housing. Well, that was not it. The next day it was doing the same thing.

Now, they are at a loss as to what to do. They told me they felt it was the computer. Told them that had just been replaced. So now they don't know what to do. Please help.

Archie

A. They are missing something! Chances are there is a partially broken wire somewhere that is coming apart when it shuts off. They should be wiggling wire harnesses while it's running to see if anything happens. I've seen the coil feed wire break on these.

GM has reduced the wire size to save weight and the wires are very thin, can't take much strain on them. Also there is a diagnostic chart in the service manual for "cranks but won't run". They should be following this chart to the letter without leaving out any steps!

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