I have a 1994 Chevy c2500 TBI 5.7 v8 that is having major issues. On a cold start everything is fine, but after it hits operating temperature it bogs really low and blows out black smoke. So far we've switched out the ECM, (didnt work) and the Spark Timing Module in the distributor (also didnt work). The previous owner had wrapped the wires going into the timing module with a lot of electrical tape. Also the knock sensor wasn't working until the timing module was replaced. My grandpa (the mechanic) degreed the engine to run in 10 degrees adnvance. Since that didnt fix the problem either, now he is unable to retard the engine back to its original setting for some reason. Only idea that he has left is the PROM in the ECM. CODE 42 SHOWS UP ON SCANNER! PLEASE HELP!!
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'94 Chevy c2500 5.7 Exuast/Engine Timing Problems
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