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01-30-2011, 02:54 PM
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w108 250SE idle problem
Hi, car is '67 250SE with M129 engine. I'm having trouble with cold starts: With the idle set to spec when warm, at cold starts the car fires up fine and runs well at fast idle for a couple of seconds, then drops right down, to around 500rpm and will soon stall. Ignition is good and the car runs perfectly once on the move, warm starts are perfect. Checked the throttle plate closes properly against the stop, can hear the suction at the IP air filter, done the CSV test and it's not leaking and it energizes at ignition on.
What i've been doing to get over it is set the cold idle just above stall, but then when the car is warmed up the idle speed is too high. If I set it back to factory spec when warm, then I get low idle problem at my next cold start  any ideas? cheers, Alex
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys 
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