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Working through the pinout I found, I did discover a poor ECM ground ( high resistance) but after running a new ground spliced into the existing ground wire, there was no change. Pins C1 and D17 are hot at all times, except when there is a no-start. Then I'm just getting a bleed through...

I wondered that too. I'd read that these cars were voltage sensitive. Checked the battery, even though it's pretty new. Also checked the alternator, which seems to be charging just fine.

That was interesting reading and gave me a couple of ideas.........but no dice with my C4

Thanks for all the input so far guys. So............ I've found time to get back to looking at this troublesome C4 and after driving it round in circles in my neighborhood, I finally got the car where it had stalled out and wouldn't re-start ( much to the relief of my neighbors). This meant...

Yes Midnight. I've had a gauge on the fuel rail and the pressure is as expected and seems to remain stable. No loss of pressure when the engine dies. It's too sudden as well. Past experiences I've had with fuel pump or pressure issues make the motor stumble or cough before dying. This is like...

HELP...............!! I have a 1990 C4 with the OHV 350 motor. I bought it "cheap" as it had been stored for a number of years, very possibly because of the problem I have with it. I now have the car running. I replaced the fuel filter, injectors, ignition system, spark plugs, egr & position...