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Old 04-07-2013, 04:29 PM
carnut's Avatar
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Join Date: Jul 2006
Location: Stockton California
Posts: 637
Does the 3 mm allen wrench adjustment adjust the throttle plate?

On my 88 300 SE I'm having an issue with cold start fast idle. Twice a week it starts cold and runs at 900 to 1000 RPM and is fine, lowering to 700 RPM within a block, but most times, it starts and dies 3 times then starts & recovers from 500 to 900 RPM and runs fine. Is the 3 mm allen wrench adjustment at the fuel distributor adjust the air flap or the mixture? If I hold the throttle just slightly before the cold start it seems better. I've cleaned the ICV, replaced the plugs and wires, Replaced the OVP relay with the 2 fuse red one and made sure the 2 hoses to the ICV are not split or loose.

81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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Old 04-07-2013, 05:16 PM
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Join Date: Feb 2011
Location: Modesto CA
Posts: 3,012
The adjuster to which you refer is the idle mixture adjustment.
It is quite sensitive; 1/8th of a turn (45deg.) can have a marked effect.

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