2004 SL500 Suddenly Started Idling Poorly......

PocoSL · 07-05-2012, 01:01 AM

2004 SL500 started idling very poorly after being parked for about a month and half. Was running perfectly before this... car runs fine on the road, only when stop and idling does it acts up. What is the cause of this?

Video: outside - tailpipe
http://youtu.be/L2T-UGDChE0

Inside - rpm
http://youtu.be/s8BpUCjzPnQ

Any suggestions or thoughts?

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Late · 07-06-2012, 12:02 AM

Hmm, i had a similar issue that was solved when i changed my crankshaft position sensor... mine definitely wasn't that bad though. It hasn't been sitting for too long but first thing i would try is unplugging both batteries and letting it sit for a night, then maybe a fresh tank of gas and an air filter check.

silence · 07-06-2012, 12:15 AM

I've got about the same thing going on with my car right now too- I "think" it's due to sticky TB/Idle control stuff. Mine was sitting as well- since the 2006 motor wasn't in the car and the car hadn't been running.

07-06-2012, 12:15 AM	#3
silence MBWorld Fanatic! Garage is empty, add now Join Date: Dec 2007 Location: Rochester, MN Posts: 1,071 Drives: sounds like airplane	I've got about the same thing going on with my car right now too- I "think" it's due to sticky TB/Idle control stuff. Mine was sitting as well- since the 2006 motor wasn't in the car and the car hadn't been running. __________________ C43- "C50'K'", lowered on 2-piece AMGs, Image Dynamics, stock looking... bike racks Mazda 3 skyactiv hatch Sequoia Limited- full exhaust, factory chrome 20s Lots of bicycles- I repair/build with carbon fiber rideonpurpose.blogspot.com

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07-06-2012, 12:02 AM	#2
Late Member Garage is empty, add now Join Date: Oct 2009 Location: New York Posts: 157 Drives: 03 SL500, 09 C300	Hmm, i had a similar issue that was solved when i changed my crankshaft position sensor... mine definitely wasn't that bad though. It hasn't been sitting for too long but first thing i would try is unplugging both batteries and letting it sit for a night, then maybe a fresh tank of gas and an air filter check.

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