Pekkle

Phew.. Need help again, I have recently replaced the Engine and Tranny mount and now all of a sudden, my car drives very rough and shaking very bad and from time to time the check engine light will blink. Can this be misfire due to spark plugs? I have 120k miles and I haven't changed the spark plugs yet.

Update:
Just read the fault codes: P0629 and P0633, anyone has any experience with these fault codes? From searching the websites it seem to indicate fuel pump, however a German site mentioned something about misfire P0629 and Combustion P0633. Can anyone help?

003stars

P0629, Fuel pump "A" Control Circuit High

P0633, Immobilizer Key Not Programmed - ECM-PCM

That's all came out from Baum Tools Unlimitted Inc. Book. Good luck. 003stars

Pekkle

Thanks 003stars, I am not sure if those code are generic or specific to Mercedes, as I that's what I found from the web as well.

I can be wrong, but will fuel pump cause that kind of shaking motion while driving along with check engine lights blinking? btw, after I shut off the engine and so far I could not duplicate the problem again. Any thoughts?