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Join Date: Sep 2015
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e90 330i missfire P0306

Having trouble trying to figure out the problem. I already changed: vanos, spark plugs, coil packs, ccv valve and hoses, injector for cylinder 6 and still have a miss fire. Also the car has a knocking noise sounds like a lifter it all started all at once. Anyone have an idea what to look for next?????
Old 09-01-2015, 12:38 PM
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I assume you pulled the codes from it?

Do a compression and leakdown test. That solved my misfire - well it told me that I have a bad head gasket and now I know what to fix. I also swapped the coils/plugs/injectors (from cylinder to cylinder) and that didn't solve the problem.

Start with the basics and go from there.
Old 09-01-2015, 06:48 PM
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Thanks Chris so I did the compression sure enough cylinder 6 failed. Zero compression
Old 09-01-2015, 09:32 PM
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Sorry - and I'm glad at the same time.

I've already begun tearing my s50 apart to replace the head gasket. I think it's in 150 pieces right now with 300 more to go.
Old 09-02-2015, 01:08 PM
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I'm going to do a leak down test today hopefully it's the head gasket as well. It does give me at times p0306 p0305 p0304 codes I clear the codes and it pops p0306 major of the time. But I know in fact that cylinder 6 has no compression. So I'm hoping it's the head gasket that's going bad on bank 2 which is cylinders 4-6.
Old 09-02-2015, 01:27 PM
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