Thread: E30 m20 misfire
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Old 09-06-2010, 09:08 PM   #6
everlast
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Join Date: Mar 2004
Location: Ottawa
Posts: 5,847
Napa carries it. Amazing stuff.

So you know its cylinder 4? Switch wires from 3 and 4 and see if the miss is still in 4. Then you've narrowed it to either the plug, injector or cylinder.

Change the plug, run seafoam or pull the injectors and have them ultrasonically cleaned, test compression / leak down on cylinder 4.
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