High idle when cold on my 2009 ml320 cdi sport

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vrrrrooooommm... high rev at start up - JeepForum.com

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Jun 15, 2011 - 15 posts - ‎7 authors
anyone know the cause of high rev to 2K rpm at start up? just recently started ... 2003WJ ... The Ultimate WJ Grand Cherokee Buyer's Guide High Idle on Grand Cherokee
11 posts
Mar 23, 2012
high idle at start
15 posts
Jun 8, 2009
Engine Revs on Start up
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Apr 14, 2009
High rpm idle on cold start.
4 posts
Jul 12, 2008
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wj over rev at start up - JeepsUnlimited

www.jeepsunlimited.com/forums/showthread.php?506251...rev-at-start...

Jul 29, 2009 - 17 posts - ‎12 authors
why the hell does my 2000 wj over rev to about 2300 rpm when start up its so ... 2003WJ Overland 4.7 H.O. ... the dealer I told them about it and they did a warm high idle software update ... 98 ZJ Laredo 5.2: Fully built and very kush. .... Jeep®, Wrangler, Cherokee, and Grand Cherokee are copyrighted and ... 4.7 high rev start
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Mar 30, 2011
2004 Grand Cherokee 4.0 High Idle
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Mar 25, 2011
RPM surging problems
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Sep 13, 2010
2002 Jeep Grand Cherokee 4.7 high idle?
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Nov 22, 2009
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High idle/rev up on startup Jeep Grand Cherokee 2000

Cars are design to run at a higher idle at start up to warm them up quick. There is a sensor that reads water temperature and tells your car's computer how fast to idle. Your RPMs seem slightly high but not out of the norm. Does idle ever drop to around 600/800 after about a minute? If not, your engine temperature sensor maybe defective.

Sounds like a coolant sensor problem. It signals the ECU for open loop, cold start rich, high idle, until warm up is reached.

What codes do you have?
You have a check light on,you have to
diagnose and repair that issue first

http://autorepair.about.com/cs/generalinfo/l/bl703.htm

High idle indicates that the engine most likely has a vacuum leak. This could be due to many causes; cracked hose or hoses, bad gaskets..ect. Hard to say exactly without more info, but you can open the hood and inspect the vacuum lines for damage or cracks. It is a 2009, so it probably is not something major.

you prob need a coolant temp sensor

If your car is fuel injection,try changing the cold start temp sender.

Hi ..... This sounds as if it's fitted with an automatic choke, as long as the revs drop when it's warm there is nothing to worry about. The indication when these start to go wrong is that the car won't start when cold ................ even then any decent mechanic can fit a normal/manual choke.