I recently installed a 95 LT1 engine, wiring harness and PCM into my 93 Z28. Everything works fine, but my service light comes on when I start the car and stays on until It warms ups, then it turns off and will come on when I increase throttle.

I don't have a diagonstic port so I can't scan the codes? Any ideas, anyone have a simaliar problem?

Thanks in advance.

I have replaced the fuel pump, 02's, lt4 km, all sensors new except the oil pan sensor which I know has a problem (it comes on when I start the car, but turns off once its warmed up.


Thanks Shoebox for the wiring help, wouldn't be running without your advice.

 

You should be able to make a diagnostic port. I haven't looked at the wiring but I will when I get home. The original 95 connector was OBDII but the programming is OBDI. Either connector is fine but an OBDI style would be less confusing. Track down a connector at a JY and get about a foot of wire attached to it. We can look up where to connect it and you'll be done.