You're looking for some pipes that bypass the throttle valve.
On older systems, you'll find an auxiliary air valve - a simple bi-metallic device that allows more air through when the engine's cold. On such a system, the tick over will be adjusted by a screw somewhere near the throttle plate.
On later systems, the idle speed is computer controlled, and there's no adjusting screw near the throttle, and a more complex valve in the same place that the auxiliary air valve was.
I'm not sure what you'll find, I haven't done much with Mercs at all, but I think you'll find some flavour of K or KE jetronic. The injector O ring suggestion is valid which ever system you have.
Number_Cruncher
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Forgot to say, there'll also probably be a throttle position switch on the throttle body. If there's an idle speed control actuator, it will need the throttle switch to signal idle before it will work. Making sure the throttle cable isn't too tight, and that the switch is actually switching (an easy job with an Ohm meter) will be worth checking.
Number_Cruncher
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Yeah .. I still remember the same simphtoms
Tbhere is some electrically operated air bypass at the theottle body , to compensate for different engine loads , aircon on or off , etc..
mine was definitely fawlty , with very funny idling ,stailly etc.
I simply removed the part , adjust the iddle a little bit higher simply by thigtening out the throttle cable , and -2 years later- still perfect .
Edited by Webmaster on 11/03/2008 at 02:15
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