Celicasaur

Hi guys, anybody experienced their M104 engine running on after the ignition has been turned off?

I bought mine with this issue, thinking it would hopefully go away when I do the necessary upper engine wiring loom replacement, but sadly it's still doing it.

Any ideas?

optimusprime m1

You will need to remove the connector in the alternator, thats after you switch off the ignition in the car .If it runs on ,then you have another problem. But this will rule out the alternator .A faulty alternator can cause this . Only remove the plastic connector ,and not the brass one .. Another thing is if the car was jump started in the past it can damage the ECU ..

Celicasaur

Thank you sir, that's useful. I remember my mechanic telling me a while back that the alternator was grumbling like it needed a change soon. I think I'll remove it and get it tested/reconditioned. Fingers crossed this solves it. I'd hate for it to be something like pre-ignition after the engine is turned off.

optimusprime m1

May be the problem .But pull the connector on it first, before you spend on it .You will be 100% sure then..

Celicasaur

Thanks Optimus

I'll give it a try when I get home tomorrow (away for xmas break right now).

The thing is, the running on, is usually for a few seconds, so it's going to be tricky to navigate my arm all the way down there (if it can even fit) to take off the connector. I'll give it a shot though. Any advice is definitely appreciated. I need to solve this mystery and my hood mystery before I invest any more money into the car.