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      10-14-2014, 03:57 PM   #1
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leo037's Avatar

Drives: E92 335i / E46 M3
Join Date: Jun 2013
Location: Toronto

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E46 M3 Mysterious Misfire! Any ideas?

Good day my fellow BMW enthusiasts,

I've been dealing with a misfire issue that is giving me headaches as I'm unable to find out the reason why it is causing the misfire. Any help here would be much appreciated!

So I've done most of the basic mechanical fixes include:

-Injectors flush
-Compression test
-Fuel filter
-Fuel system cleaner x 2 (on two tanks)
-Oil cover gaskets

After the above I figured it was an electrical problem, and therefore did:

-Wiring test
-ECU reflash

Results still the same, "Cylinder 6 misfire". The ONLY temporary fix that I've discovered is resetting the ECU, that will give me 15kms of normal driving until the misfire comes back.

Any suggestions?

Thanks in advance!
Honda Prelude 5th Gen | Acura CL Type-S | Nissan 350z Roadster | BMW E92 335i | BMW E46 M3
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      10-16-2014, 07:49 PM   #2
edwinm3's Avatar

Drives: SO/SO DCT M4
Join Date: Nov 2011
Location: Doral

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check your crankshaft sensor, when it's going bad it causes misfires and you'll never know that's the cause.
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