I just purchased an 85 Z28 which originally had the TPI 305 in it. The previous owner put a built 89 TPI 350 in the Z28. Bored, mild cam, ignition system, etc, as well as a different rear end. My question is, the car runs great but I think shes running rich. Does the stock PROM suffice or should I look at a replacement concidering the new engine isnt exactly stock.... If I should look at a replacement can someone point me in the right direction...

 

Ok i Pulled the ECM and found these numbers. The main ECM number is 7-7165 and the code inside of the blue chip is APYU 3516. Previous owner claims that he added a Hypertech chip. Not seeing it, so apparently he was wrong.

 

You now have 3 post with the same questions? Your car is running rich, have you gotten any codes from the ecm?

 

Im sorry about the multiple posts, dont know how to take it down from the incorrect area. Honestly I dont even know how to pull trouble codes from these old computers.

 

Here's something for you to read:

http://www.troublecodes.net/GM/

Good luck!

 

Consider buying or building an ALDL cable. Datalog while driving. TunerProRT or winALDL. Free program. Read stickies on datalogging.