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2002 C230 (M111) w 100k on it, first start - rough idle

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Old 05-19-2010, 06:44 PM
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Exclamation 2002 C230 (M111) w 100k on it, first start - rough idle

This just started about a week ago.

Car is fully serviced (plugs, fuel filter, cam sensor replacement at dealer), etc.

On the first start of the day, the car feels like it is running on three cylinders. I don't give it more than 2-3 seconds before I detect the condition. Turn it off, then turn it right on again and it's fine.

I did search. Sounds like the M271 motor has throttle body issues, but this is the M111 motor. I've only had the car for 10k, but so far no problems.

Should I see if it self corrects on the first start? No codes, no CEL. I'd rather not unless I get a consensus. Input welcome! I am thinking of running some Techron for giggles, but it's got new plugs and filter already... hmm.

Input welcome!

p3
Old 05-19-2010, 07:34 PM
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Originally Posted by phoenix_iii
This just started about a week ago.

Car is fully serviced (plugs, fuel filter, cam sensor replacement at dealer), etc.

On the first start of the day, the car feels like it is running on three cylinders. I don't give it more than 2-3 seconds before I detect the condition. Turn it off, then turn it right on again and it's fine.

I did search. Sounds like the M271 motor has throttle body issues, but this is the M111 motor. I've only had the car for 10k, but so far no problems.

Should I see if it self corrects on the first start? No codes, no CEL. I'd rather not unless I get a consensus. Input welcome! I am thinking of running some Techron for giggles, but it's got new plugs and filter already... hmm.

Input welcome!

p3
So after warming up, the car idles and runs fine?

This sounds like a CoilPack issue. I'd replace each coil pack until you found the offending coil.

This is a really easy thing to fix.

Ed
Old 05-19-2010, 07:45 PM
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Negative.

It is immediately fine upon a restart. so..

0630 - Start the car, turn it off within 2 seconds.
0630 and 3 seconds - Start car again, it starts and runs just fine. =)

Doesn't seem to match coil pack problems I have read about, does it? [thank you]
Old 05-19-2010, 09:18 PM
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Originally Posted by phoenix_iii
Negative.

It is immediately fine upon a restart. so..

0630 - Start the car, turn it off within 2 seconds.
0630 and 3 seconds - Start car again, it starts and runs just fine. =)

Doesn't seem to match coil pack problems I have read about, does it? [thank you]
Seems odd that it would restart just fine. However, when we have a coil misfire there has to be soo many in 1,000 fires in order to trigger the code. Perhaps there is an issue with a grounding point for a pack. Just seems Spark related to me. But hey what do I know.

Ed
Old 05-19-2010, 09:28 PM
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Right, and it's FINE the rest of the DAY. Can go shop for a few hours, come back, and no problems. It really seems on first start.
Old 06-03-2010, 09:41 PM
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It started acting a little better...



So I hit it with a 20gal (service) bottle of Techron. I flogged it a little bit, but forgot it was in there and filled up at 1/4 tank...

No return problems yet, I'll keep you posted... and try to get the revs up to clean it up.
Old 06-04-2010, 04:40 AM
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While I'd imagine that one time with that much techron won't hurt, I believe Glyn (the oil man himself) said that too much Techron can be corrosive. Just so you know in the future.
Old 06-04-2010, 06:27 PM
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Mine does this exactly from time to time.
Shakes spits, and shudders, then turn off restart, and all is well.
I chose to ignore it. It hasn't become a big issue.
Old 06-07-2014, 11:36 PM
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OK, so my wife just bought a 2002 c230 with 114 k miles on it. It now does this exact same thing. Start....rough and violent shake. Turn off and fine. Few days later again.....Start....ROUGH and violent shake.
PLEASE HELP ME OUT!


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Old 06-07-2014, 11:52 PM
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Is your C230 KOMPRESSOR or without..??

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Old 06-10-2014, 01:52 PM
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When it does this sheet, turn it off and restart it.
Problem solved.
Originally Posted by C230 COUPE 02
OK, so my wife just bought a 2002 c230 with 114 k miles on it. It now does this exact same thing. Start....rough and violent shake. Turn off and fine. Few days later again.....Start....ROUGH and violent shake.
PLEASE HELP ME OUT!


THE IPHONE GUY
Old 06-10-2014, 03:17 PM
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Sounds like a cold start issue. Considering it's fixed right after you shut it off I'd look for something electronic causing it.

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