2002 c240 rough idle - Mercedes-Benz Forum
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post #1 of 1 (permalink) Old 06-24-2018, 04:27 PM Thread Starter
BenzWorld Newbie
Date registered: Jun 2018
Vehicle: 2002 c240
Location: Amity or
Posts: 1
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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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