Questionyes i have a 86' cadillac coupe deville and my check engine light keeps coming on and off
AnswerPerform this procedure:
1. Ignition ON. Engine OFF.
2. Simultaneously push and hold the OFF and WARMER buttons for 3 seconds and release them.
3. Diagnostic codes will appear and then will stop.
4. Write down the codes EXACTLY as they display evev if they display more than once.
5. turn off ignition.
6. tell me what codes you got.
tom