3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
The wire from ECU to Coil pack...no broken wires
Checked the fuel injectors and injecting fuel...all ok
I have checked all of the fuses,cleaned all the electrical connections, etc.
The engine starts (briefly) on two cylinders, but is obviously very lumpy.
I had it on a diagnostic computer but that did not flag up anything which coincides with the problem.
Any help / guidance would be gratefully received.
Have you done a compression test? Based on your statment of replacing the plugs, coil packs, camshaft sensor then its possible theirs a compression problem. All combustion engines need air, fuel, spark and compression to run. if your missing one, it wont.
Have you overheated the car at all? Blowing the headgasket due to overheating could cause an issue with the head as it is aluminum and that could be the reason for the compression loss.
Thanks for the reply lord vader,
Sorry meant to put on post that a compression test was done and all ok. Cylinder 2 & 3 are just not getting a spark. The car hasn't been onverheated either.
Thanks Katie :-)
Have you tried swapping the coil packs from those cylinders with coil packs from the other working cylinders? Doing this allows you to see if the coil pack is faulty. But you said you replaced them. Are the groundig straps attached after throwing the coil packs in?
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