ecm and prom
Thread Starter
2nd Gear
Joined: May 2014
Posts: 2
Likes: 0
ecm and prom
looking to return my 88 to stock performance. I am going to replace the ecm. I was told when when I bought the car it had a performance chip in it. is this the prom? Should the prom be replaced also? anything else?
Team Owner
Joined: Sep 2003
Posts: 25,393
Likes: 2,741
Unless you have a particular problem that has been "properly" diagnosed as an ECM problem there would be no reason to replace it.
The PROM if you were told was a performance chip then you would only be looking for the PROM or possibly just a write of the original information to the PROM that you have now provided it was done on a correct replacement product.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The ECM just does what it is told to do. If it is fully functional then there is no need to replace it.
The EPROM contains the programming that the ECM executes. THAT is the part to replace. If you can find a stock EPROM you will find that it is VERY expensive. That said, you can have a new EPROM programmed with the stock programming.
The EPROM contains the programming that the ECM executes. THAT is the part to replace. If you can find a stock EPROM you will find that it is VERY expensive. That said, you can have a new EPROM programmed with the stock programming.
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
PROM is slang for memcal, or Calibration module. PROM would be programmable read only memory, and the memcal is comprised of 3 chips for your car. There's plenty of people that can provide OEM programming for your vehicle. Like the others, there's no need to swap out the ECM unless it has be diagnosed as faulty.
