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Old 06-03-2013, 06:25 PM
engatwork's Avatar
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Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,716
cleaning throttle butterfly, 05 E320, issues after cleaning?

Seems to be something going on in the 05 E320 wagon that after it is up to operating temperature, as long as it is in gear, it idles down about where it is supposed to be. When put in park or neutral the idle increases to between 2 and 3k and kinda swings around. When I put my hand over the intake at the MAF sensor (air filter housing is off) without letting the engine shut off it settles down and idles as it should.

This past weekend I cleaned the throttle butterfly along with the valve cover crankcase vent system and replaced the respective hoses. Still changing oil every few days trying to clean out the sludge. On a side note I have started nosing around for another engine.

I'll put the computer on it later on in the week as time allows.

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Old 06-03-2013, 06:44 PM
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Join Date: May 2012
Location: El Dorado Hills, CA, USA
Posts: 418

Business troubles with the clients....

Maybe some liquid penetrated the seal on the butterfly shaft and made it to the wiper or resistive element of the feed back potentiometer. The element and wiper needs to be cleaned with contact cleaner on a cotton swab. Make sure you wipe it clean, and not let the cleaner evaporate. Next use a little lithium white grease to lube the wiper and resistive element. You could use some 800grit sand paper on wiper to before the lube.

Best of luck,


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Old 06-03-2013, 09:26 PM
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Join Date: Jan 2008
Location: Melbourne Australia
Posts: 844
Be very careful with these series of throttle valves. They suffer from the degrading wiring syndrome. They are big bucks for a new one. Repairing the damaged wiring is very difficult.
Better to leave these things be.

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