chagger32

I bought a 84 vette with a messed up ECM my only question is if i buy a re manufactured ECM will i need to go to the dealer for them to program it ?
Also could i buy a ECM the same year at a junkyard with getting around the dealer programming it if need be?

Kevova

A used ECM would need to have the same model number as the original one. There is a small door on ECM and the PROM or program chip is under it. Carefully remove and transfer it to other ECM.

Dt86

No programming needed. Just plug and play. As stated you need the same computer number and prom for your car.

zachaeous

I had to replace the ECM in my 1984 with a auto transmission. I tried the junk yard route and had to send two back for non-working. I finally found a Chevrolet dealer that had one in stock. It was a GM unit that was re-manufactured for GM. It worked perfectly and has for 6 years now.

You will need the proper ecm auto or manual transmission. The prom mentioned above are held at a premium price so be very careful removing and replacing yours. The re-manufactured ECMs normally do not come with the prom.

Good luck with your repair.