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1998 bmw 540i having a misfire on cylinder 5 changed the plugs and coil packs. It ran fine for a couple days, then it began again, giving me a check engine, and it's idling rough at low rpms.

I can reset computer by unplugging battery and it will run fine for several miles, but the problem keeps coming back. Thinking maybe catalytic converter. Any suggestions?

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Is the same cylinder causing the problem? If so take a close look at the spark plug for fuel fouling. The cylinder may be over fueled causing plug fouling. You may also have a bad coil or defective spark plug. Try swapping coil and plug with one from adjacent cylinder to see if misfire changes to that cylinder

Posted on Apr 06, 2015

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Posted on Jan 02, 2017

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