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Old 10-05-2009, 01:20 PM
hron61's Avatar
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Join Date: Aug 2009
Location: lakewood,wa
Posts: 10
idle hunts only when cold

i have a 92 190e 2.3.
new problem started last week out of the blue. first thing when cold and only when cold the idle will hunt badly, it goes to about 1200 rpms down to almost dieing and back up and back down over and over untill after a few mins and once its warmed up it idles fine (not perfect but ok). after that it runs normal upon restarting. i cleaned icv, checked ovp fuse (no lights are on), cleaned throttle postion switch. been looking at past threads alot lately and cant quite figure that problem out. any guesses what i should try? thanks batman

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Old 10-05-2009, 02:07 PM
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Posts: 393
clean your air intake temperature sensor, i know it sound crazy, but two guys on benz-world have reported weird cold idal problems (on 320's but exact same issues)that completely disappeared when they cleaned the intake temp sensor.
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Old 10-05-2009, 04:43 PM
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Location: lakewood,wa
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forgot to mention that i tried that also. took it out and sprayed it with carb cleaner, no effect.
keep em coming. thanks
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Old 10-06-2009, 09:15 PM
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Location: lakewood,wa
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last night i was feeling it and opened up opv relay and reflowed all the solder joints, and while i was in the area i did the same to the fuel pump relay. i took out the temp sensor which is only about 25,000 miles old as is the 02 sensor. i replaced spark plugs which helped it run better after it was warm. still stalls when cold. any more ideas? thanks

Last edited by hron61; 10-06-2009 at 09:17 PM. Reason: added word
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Old 10-07-2009, 01:54 PM
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Join Date: Jun 1999
Location: Albuquerque, NM USA
Posts: 1,946
A cold engine requires a richer than normal mixture and a little extra throttle to compensate.

Components involved are
temp sensor
cold start injector
idle control valve

Vacuum leaks defeat the purpose.
Kent Christensen
'07 GL320CDI, '06 SLK350
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Old 10-07-2009, 05:00 PM
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Join Date: Jul 2008
Posts: 1,236
Start spraying carb cleaner around, you'll find the vacuum leak.


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