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Old 01-30-2011, 01:54 PM
chazola's Avatar
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Join Date: Nov 2003
Location: London, United Kingdom
Posts: 1,241
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

__________________
1993 320TE M104
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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
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