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I know this may be tricky but I really need some advice.
104 engine, '95 C280. Idle fine prior to 30K service. Afterward it had lumpy idle. Taken back 3 times now. Plugs that were changed did not have fouling, also has brand new wires and fuel filter. Engine scoped for tuning. It is O.K. One cylinder is turbulent followed by a slight quick surge. This is intermittant, not constant or frequent. After idling a while in drive it will get sublimely irregular. Archives suggest: 1. wiring harness 2.HFM control unit 3. idle speed accuator (?) 4. air plate position indicator (?) 5. throttle switch (?) My visual inspection of wiring harness reveals no obvious degeneration. Runs fine, smooth acceleration, no stalls. Please offer some suggestions, I need to take it back until it is fixed. THANK YOU. ![]() ------------------ 1979 300D 133K miles 1989 300SE 1995 C280 |
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