New ecm 91
Thread Starter
Instructor
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
New ecm 91
Hey guys I’m going to replace the ecm on my 91 vette From one I bought on ecklers and I just wanna know if I should replace the prom also, if I do change the prom out do I need it reprogrammed? Or is there one I can buy and just drop in new computer
Pro
Joined: Jun 2008
Posts: 674
Likes: 235
From: Louisville Kentucky
2023 C4 of the Year Finalist - Unmodified
2022 C3 of the Year Finalist - Unmodified
2021 C4 of the Year - Unmodified Finalist
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
Keep the Programmable Read Only Memory chip from the old unit and install in the remanufactured (new) one. The new unit will not have a prom in it. No need to reprogram the PROM.
Thread Starter
Instructor
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
thank you , also do I need to enter a diagnostic mode after I install the new ecm or can I just reconnect the battery after install and the car will fire up ?
Pro
Joined: Jun 2008
Posts: 674
Likes: 235
From: Louisville Kentucky
2023 C4 of the Year Finalist - Unmodified
2022 C3 of the Year Finalist - Unmodified
2021 C4 of the Year - Unmodified Finalist
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
plug and play, start it up and go! The PROM has all the info the car needs to run. The ECM just reads the PROM. Make sure the battery cables are disconnected before doing this!
Thread Starter
Instructor
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Pro
Joined: Jun 2008
Posts: 674
Likes: 235
From: Louisville Kentucky
2023 C4 of the Year Finalist - Unmodified
2022 C3 of the Year Finalist - Unmodified
2021 C4 of the Year - Unmodified Finalist
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
Your welcome brother.
