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Old 11-01-2007, 12:34 PM
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Join Date: Oct 2007
Posts: 5
93 300E - does it have an idle speed switch?

My 93 300E 2.8 is exhibiting some symptoms that are similar to what some have described on here as a bad idle speed switch (as in the switch on the TB that is closed both at idle and WOT). Sometimes when I'm sitting at a light with the A/C on, the car wants to lurch ahead when the A/C kicks in and out. Also, it "hunts" (surges) while idling in park sometimes like it is not entering the idle program. However, I see no mention of a "switch" as such on my service manual CD for the 93 104 engine. Instead, it describes the idle being controlled by a number of parameters (coolant temp, MAF, etc.) though what they call the "electronic accelerator pedal", which I'm assuming is "fly by wire" arrangement on the TB. Can anyone confirm the presence or absence of a simple idle control switch on the 93 104 engine? Thanks.
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