[Erka93]

Hello everyone, please I need your help to solve this problem.
I have a misfire code P0303 car has a rough idle and runs without power.

Things that I have changed to solve the problem:

- New Coil packs
- New Spark plugs
- Ecu (repaired in a professional shop)

Nothing changed


I was starting to think about changing injectors and doing a compression test to the engine but now I think that the problem can be the cable harness of coil packs because today I noticed that the spark plug at cylinder 3 that throws the code was still brand new was not ignited. What could have caused this ? What should I check next what do you suggest?

[sailorbob]

Are you sure no. 3 cylinder is getting fuel?

[ljohnson]

Hi - did you manage to sort out the problem? Having the same issue so really interested! Thanks

[mishu]

i had a similar issue on B38 with one piston shutting off i changed sparkplugs, coils and injectors my issue was electrical and one of the cables were bad, i dont regret changing all of those but it was a simple 30$ fix