95' C280 high idle at operating temperature? - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 01-04-2008, 04:09 PM Thread Starter
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Date registered: Jan 2008
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95' C280 high idle at operating temperature?

I own a 95' C280 and the car idles fine (+/- 500rpm) upon start up but, once it reaches normal operating temperature it idles (+/- 1,000 rpm). Needless to say when I engage or disengage drive/reverse it is a bit of a rough act. I had my mechanic look into it, he adjusted the idle and sent me on my way it seemed to idle well for a few days but, now it's right back were it was. I had noticed that the air temp. sensor (located towards the rear of the engine compartment, in the intake pipe/tube?) had been disconnected. I plugged it back in "noticing that it seemed to have an oily residue covering it" could this sensor be faulty being that it idles fine when cool and high when warmed up? I have also plugged/unplugged the sensor during idle and it seems to have no affect either way. PLEASE HELP!!! Thanks, Matt
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