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  Topic Review (Newest First)
06-24-2018 04:27 PM
2002 c240 rough idle

My 2002 c240 has rough idle. Had misfire code show up and replaced plugs and wires. I used oem wires and ngk plugs. The misfire went away and the car runs fine driving down the road. Did a smoke test and sprayed brake clean on intake to check for vacum leaks. Long term fuel trim is a little high on bank 2 6.2 to 12 bank 2 1.6 to 3 at idle vacum is about 15 and it should be around 20.

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