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|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.|
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I need help... I originally had emission codes that the shop thought was causing the random misfires P0420 & P430. The misfire codes were P0301, 304,305,306.
I installed new cats (headers) and O2 sensors and the emission codes are gone but the misfires still exist. They are random in the sense that you can reset the codes and drive it for 15 minutes and the they will show up and sometimes on different cylinders.
This is what we have done and ruled out.
Plugs are new, connector boots are new, Fuel pressure checks out. New oil and filter (BMW 5w30 full synthetic)new air filter as well.
I am stumped and out about $1800 so far.
Any help would be much appreciated.
what about the misfires changing? I cna reset the codes and drive it and run the codes again and then I may get 1,2,3,4. Its happen twice so far. I have even replaced the #1 coil and switched it bto see if the bad coil moves with it. sometimes it does and sometimes it doesnt.
I just drove it and now I have o2 codes and fuel trim bank codes P0170 & P0173, P1188, P1189 and misfires in 1,2 3,4 not 5 and 6 now.
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