I replaced the idle air control valve because when the car is warmed up and I come to a full stop at idle with the car in drive, the idle drops too low, below 500 rpms. A mechanic cleaned the electrical plug which plugs into a component that is also connected to the idle control valve and it worked fine for a few days but now the too low idle has returned.? I thought the microprocessor might be bad but I don't know what, where or how much it is.
1991 300e what microprocessor controls the idle air control valve? on 1993 Mercedes-Benz 300E
by pet erg in Riverview, FL on August 15, 2013
ANSWER by globalhelper on August 15, 2013
ck circuit for high resistance. that would cause this or poss dirty throttle body