Vette(s): 1993 Chevrolet Corvette Base Edition. Exterior Color is Polo Green with Tan interior. 5.7 LT-1 V-8 with 4-speed automatic transmission.
I have stalling issues on my 1993 Chevy Corvette 5.7L LT1 w/ auto. It would run for a minute. Then it will shut off all of a sudden. Sometimes, it will fire right back up and stall out again, or it will keep cranking and won't fire up for about 5 minutes or so. I check fuel pump pressure and it was good. It sounds like the common symptoms of a faulty ignition control module. So, I went and bought one from Auto Zone and installed it. It's still stalls out. I checked for spark and there was none when it stalled out. I scanned the ECM for trouble coded. They were 16 & 43. I noticed on the Opti-Spark distributor lead circuit from the ECM, there was a voltage reading of 8.9 volts. It supposed to be a 5 volt reference. I also noticed a low voltage reading of 0.5 volts on the ICM circuit coming from the ECM. Could it actually be a bad ECM that is causing me this grief, or bad ECM ground or bad ECM wires touching each other. I don't want to spend money on a ECM if I don't have to. I want to make sure that I cover all based before I even buy a ECM. If anyone has any suggestion, I would appreciate it. Thanks.
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