PeachParts Mercedes-Benz Forum - View Single Post - 126 -- high idle

LJetronic · #2 02-22-2010, 09:36 PM

possibly the throttle position sensor? i had a similar problem with my 190e. Look slightly behind the ignition distributor and along the drivers side cylinder head for a 3 pronged plug. Unplug the connector and get your multimeter set to continuity. Put one probe on the center pin and the other on one of the outer pins. With the throttle closed, one pin should have continuity. With the throttle wide open, the other outer pin should have continuity with the center pin. Without this signal, the computer does not enter the idle circuit and thus, a high idle will result.