C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

W203 Rough/low idle when in gear

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Old Feb 9, 2010 | 08:55 PM
  #1  
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05 C-230 Kompressor
W203 Rough/low idle when in gear

Hey guys, I have an 05 C230K (W203) that has just over 72,000 miles on it. When in gear at a stop it idles very low it seems and vibrates the car. Is there something wrong or is this normal. It drive fine other than that but it has me a little concerned.

Any help would be appreciated.
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Old Feb 9, 2010 | 09:32 PM
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Hrm my 2005 C230 (75,000 miles) does this every now and then. You're not getting a CEL?
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Old Feb 10, 2010 | 03:09 AM
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05 C-230 Kompressor
No CEL. It just shakes when at idle, could it be a dirty MAF? Im clueless about these cars I just got it.

HELP!
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Old Feb 10, 2010 | 03:32 AM
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Your next fill up go buy yourself a bottle of techron at chevron
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Old Feb 10, 2010 | 05:07 AM
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Originally Posted by krisv420
Your next fill up go buy yourself a bottle of techron at chevron
this is actually a good idea, shocking coming from this source... BUT, if it starts to idle badly even after using some Techron (which I have a feeling that it will), I would say check your throttle actuator, it may have gone bad.

do you get a really rough start-up in the morning?

I used to get pretty rough idles and really rough start-ups in the mornings. my members, the dealer and I all tried to determine what was wrong and it was the throttle actuator that went bad. here's a long read but similar: https://mbworld.org/forums/c-class-w...-cold-cel.html

OR, has your car been checked for the recall? https://mbworld.org/forums/c-class-w...rk-recall.html
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Old Feb 10, 2010 | 09:45 AM
  #6  
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05 C-230 Kompressor
Thanks for the info guys, I think Im going to do the Techron and clean the MAF. Ill report back if that worked.
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Old Feb 10, 2010 | 12:49 PM
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1999 CLK320 (sold), 2007 C230 SS (gone), 2000 Grand Marquis, 2011 CR-Z, stay tuned...
It could also be engine mounts. When the revs drop to idle, the engine starts to shake the car. It makes a louder sound and it sounds like the idle's lower, but it's not.
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Old Feb 10, 2010 | 02:06 PM
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Also could need a tune up... Plugs and wires... B4 you get a cel.. My car died at like 82k had to get all new wires and plugs
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Old Feb 10, 2010 | 02:45 PM
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05 C-230 Kompressor
Ill look into new plugs, but I was under the impression that these cars had coil packs. Am I right?

Well I put some Chevron Techron in the tank, we'll see how it reacts. I also did the thorttle pedal reset and WOW! what a change!
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Old Feb 10, 2010 | 04:46 PM
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You're correct...C230 has coil packs, so just plugs no wire!
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Old Feb 10, 2010 | 09:51 PM
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I'll be checking into that throttle reset soon
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