Rough Idle When Hot Outside - Any Ideas?
05-31-2012, 09:39 PM
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2007 CLS550
Rough Idle When Hot Outside - Any Ideas?
Lately, my car ('06 S500) has had a rough idle at times. It seems to me that it typically happens when it's hot outside, and the AC is running hard. The car runs just fine under throttle, and the AC is ice-cold; the only issue is the occasional rough idle. Any ideas what may be the issue? Thanks in advance.
06-01-2012, 04:16 PM
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2005 Mercedes S600, 2004 Mercedes E500 4-Matic, 2002 Mercedes C32 AMG, 2001 Trans-Am WS-6
Lately, my car ('06 S500) has had a rough idle at times. It seems to me that it typically happens when it's hot outside, and the AC is running hard. The car runs just fine under throttle, and the AC is ice-cold; the only issue is the occasional rough idle. Any ideas what may be the issue? Thanks in advance.
Perhaps the Crank Position Sensor going bad (but that would usually be consistent when the engine is hot...not just ambient temp)?
I had an actual *misfire* and hard start on my S600 only when hot outside about 2 months ago. Replaced the CPS, coolant temp sensor, fuel filter, intake manifold temp sensor (really gunked up), and the air pressure sensors on my airboxes. No problems now. Not sure which was the culprit to be honest, but it got it done.
