i swap a y8 for a z6 i have the jumper for obd1 but im having a problem trying to get it to start, it turns over but im not getting any spark and my main relay assembly is make a loud noice. ive check the wiring harness everything seems right

 

Make sure your timing is right.

 

nobody can e-fix this for you, it could be anything. Checking timing will be difficult with no spark *****