BMW 645CI misfire

[volvos60s60]

Hi. I have an '04 645 Ci with a misfire on 4 cylinders, which only happens when cold. If I turn off the engine & restart after 30 seconds, all is fine.

I recently had to replace a faulty voltage regulator. Is is likely that a faulty voltage regulator may have damaged some coil packs?

Thanks

[boz1]

volvos60s60 said:

Hi. I have an '04 645 Ci with a misfire on 4 cylinders, which only happens when cold. If I turn off the engine & restart after 30 seconds, all is fine.

I recently had to replace a faulty voltage regulator. Is is likely that a faulty voltage regulator may have damaged some coil packs?

Thanks

Well the obvious thought with a V8 would be that a misfire on 4 cylinders would be likely to be coming from 4 cylinders on the same bank, surely...? In which case, consider parts of the system that are shared for each bank of cylinders. How do you know it's 4 though?

[Horse Pop]

Have you asked on a BMW forum somewhere?

This seems like the sort of thing somebody may have experience with.

Have you got fault codes etc.?

[Claudia Skies]

Horse Pop said:

Have you got fault codes etc.?

Agreed. Proper diagnostics should answer that question pretty quickly.