I have a 95 se , k code. says PROM error for ses light coming on. Went and changed the whole ecm with the same Prom chip numbers on it , BNWB 1621 5814.
Cleared the ses code and drove about 2 blocks and the ses came back on and started running rough again?? The second scan resulted in a prom error and misfire detected?
So I put in new plugs and wires cuz the motor was used when I got it. Cleared the codes and the Prom error came back but no misfire detected code?????
So I thought the used ecm was bad so I got another one and the same thing is happening. Is there something causing the ses code to come on for a Prom error even though the Prom is fine??? Thanks a million for any input!!!!!