Cutting off after about 5 min

[cdedwards129]

Update...
It's getting spark also


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[JP02XLT]

Do you have fuel pressure when it quits? If it is lower than the required pressure this can be a problem as well. I chased an S-10 pump for a month, it would randomly die then re-start shortly after, it had perfect fuel pressure all the time, I finally found it by getting the pump specs and doing a timed volume test and it was way short on delivery.

I would also check the crankshaft position sensor, just worked on a jeep that was dying as well and sometimes a no start situation and it was a failing CPS sensor, no service engine light or code either, had to put it on the scope and see the diminishing signal.

JP02XLT

 

[cdedwards129]

Yes I still have spark and fuel when it's acting up..... today it did something new, when I started it at work it would idle high at 1500 and wouldn't come down tell I cut the truck off, but then the truck started back up just fine and run flawlessly all the way home (about 25miles)


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[cdedwards129]

Would I need to set the time through the distributor?


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[cdedwards129]

Ok so I believe I have finally got my problem fixed.... turns out it was the diablo chip in my pcm. I pulled the chip and not a problem one since...


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[cbxer55]

Yeah, unfortunately chips are known to cause problems. I had JET chip on mine. It started intermittently just quitting, even while going down the highway at 70 mph+. Blam, it would just die. Coast to the side of the road, wait a few minutes and it would start right up. Scratched my head and replaced things for quite awhile before I finally remembered that chip, which had been on there for over 10 years. Removed it and the problem vanished.

Guess it just got corrupted over time.