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Old 10-06-2000, 01:43 AM
unkl300d's Avatar
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Join Date: Jul 1999
Location: San Francisco, Ca
Posts: 2,487
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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