M104 on a 94 E320 runs slightly rough at idle when Air Pump is On

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M104 on a 94 E320 runs slightly rough at idle when Air Pump is On

03-27-2010, 09:56 PM

777funk

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Join Date: Dec 2006

Posts: 1,051

M104 on a 94 E320 runs slightly rough at idle when Air Pump is On

I've noticed that I have a slightly rough idle when the air pump is on. I can hear the air pump pretty good when it's on (EDIT added detail: if I'm near the engine with the hood open). I can feel a decent shake which almost feels like a slight mis-fire while it's running then the engine is as smooth as a top once the air pump clutch disengages.

Any ideas?

fwiw... I'm getting a pretty good rotten egg smell when I floor it. I can smell it in the car even with the winders closed.

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Last edited by 777funk; 03-27-2010 at 10:11 PM.

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