M3 issue

[Merville]

Hi there, i am having a issue with my 2004 M3... it was running very well and one day i went to start it and it had nuthing. It started fine but was running very rough. Small back fires and when i went to drive it it just sputtered and didnt want to drive. It has just over 100k and has been only worked on by BMW and its up to date on all services. It also has a check engine light on now. Starts fine just runs rough. Have not tried to take it out of garage. I am thinkin sensor or something like that. Converter perhaps. Any ideas?

[k.sidlosky]

Ignition of some sort. Coil, plugs, wires where applicable, or crank sensor. Faulty fuel injector, bad regulator, or maybe a pump.

[prisonbreak_]

Check your plugs

[joeyl13]

Check your MAF

[BimmerE39]

Could be a number of things..especially those mentioned above. It could also be a bad O2 sensor as well.

[RoadsterMadness]

Sounds loudly like - first, ignition coil/coils (the Bremi brand coils thy came stock from the factory are now being replaced when they wear out with BOSCH coils at the dealerships - FYI). If you do have a bad coil situation, much better to have all of them changed while the work is being done. Second possibility is the MAF which may have caused your car to go into "sluggish/sleep mode". Having said this, I just had this happen on my E46 M3 which, while air flow on mine is very different, the root issue is the same. I'd all but bet you have a bad coil. Let us know. Good luck!!!

[Dukekid68]

Originally Posted by prisonbreak_

Check your plugs

+1 - wires as well

Sounds like what happened with my boat, ran a bit rough suddenly, no power, turned out to be a burnt up wire, plus plugs and wires is a cheaper place to start