Fix is to replace head, figure a few thousand to fix (part is 2K). Because of the way it happens, you will not likely get a CEL. It will build up carbon and prevent the valve from seating and walla, rough idle that gets progressively worse. I have also replaced the MAP, MAF, one other ignition coil and the O2 sensors were already replaced when I bought the car and it just rolled over to 154k. 2003 up to early 2004 had a defect in the design of the head. ![]() It drives perfectly fine if I'm driving the freeway or in general but it's only at idle it runs really rough, I will have the check engine light checked out later today but the car has had it on since I bought it so not sure if it has set any new codes. DAS says the car has no codes, everything looks great but after the engine is warm I cannot duplicate the problem. In the morning when I start the vehicle up, the idle surges about 500-600 RPM above idle for about 45sec-1min and then finally goes away. I'm stumped as to what it could be and don't want to keep throwing money at it. I've got a 2006 203 C230 with the 112 engine. If you are getting getting contaminated in the intake with oil that's your first clue. In the morning when I start the vehicle up, the idle surges about 500-600 RPM above idle for about 45sec-1min and then finally goes away. Don't change O2 sensors unless you get a code for it, besides, the O2 sensor is usually bypass at idle and full throttle and car runs in open loop mode and doesn't use O2 sensor info. Ive got a 2006 203 C230 with the 112 engine. Inspected my coils and plugs and found #2 had completely come loose and the boot for the plug was cracked so I replaced it and put all new spark plugs in which it definitely needed, still didn't resolve the issue. 06 W203 C230 Rough Idle on cold startup, help please Im an up-and-coming MB technician who is trying to get my homework in. ![]() I got a huge fuel smell coming from the engine bay and assumed I had a bad injector so this last weekend I replaced all 4 injectors and the fuel filter but the car still ran rough and rich. Hi there, I have a 2003 C230 Kompressor sport with the 1.8L and 2 weeks ago out of nowhere, thr car started running rough upon startup and at idle.
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