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Ok I have been working on a 1990 Oldsmobile 98 with a 3.8 V6 and now after fixing brake lines and rear wheel cylinders it is stalling.
After running for awhile(more than 15 minutes) it will stall just like you cut the ignition. I had no spark and no injector pulse. So I changed the crank position sensor. The car was running great and then the same thing. No injector pulse. I did not check spark this time.
I am not sure what else to change or test. Also if that car shuts off and I wait a few minutes it will run fine for about 30 seconds.
What else controls injector pulse?
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Well the car had a slightly different symptom which was after shutting the engine off it would not start. Before it would die on it own.
I tried this website which is great but not for the 1990 car I was fixing http://easyautodiagnostics.com/ I’m sure this will help 1991 and up car owners with the three separate coils.
So the fix was the ignition control module under the coils. I got it and the coil for $18 at the local junk yard. I ran it for over and hour shutting it off several times and starting it right back up. No issues so far.
Have you checked fuel pressure? It wouldn’t be beyond the realm of possibilities that you’ve got a bad fuel pump. It is a GM after all. 🙂
More info on solving no start issues here.
http://www.ericthecarguy.com/faq/solving-automotive-no-start-problems
Please keep us updated on your progress.
Yea the car is still running good today. A fuel issue would not explain no injector pulse or spark. I did not use a fuel pressure gauge but I did purge it with a screw driver and plenty shot out. I did that first because it was low on fuel and up on ramps, I was thinking it could have run out of fuel, but it was just the ignition control module.
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