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Old 08-05-2009, 01:08 PM   #1 (permalink)
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Date registered: Jun 2009
Vehicle: 2006 C230 Sport
Location: Sugar Land Texas
Posts: 39
Rough Idle After Sitting for Few Days

I have noticed that after our C230 sits for a couple of days without being started say from Friday afternoon until Monday morning upon start up the car seems to idle a little rough and almost feels like it has a miss. Also, there is a gurguling sound coming out of the exhaust. After about 10 or 15 seconds everything smooths out and runs fine. Is this common with other 2006 C230's? Before i got alarmed I wanted to check. I did a seach but didn't find anything specifically the same. I have also noticed that on start up from an overnight sit, the engine makes a noise alsmost like a "Knock" for about 2 seconds. I figure that is just from the oil being in the pan and the engine being cold.

Anyone experience anything similar?

Thanks!
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Old 08-05-2009, 06:43 PM   #2 (permalink)
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I figure that is just from the oil being in the pan and the engine being cold.
You guessed it. Both issues you are experiencing are caused by this. Nothing to worry about really.
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Old 08-06-2009, 02:12 PM   #3 (permalink)
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Date registered: Jun 2009
Vehicle: 2006 C230 Sport
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Ok, thanks. With the sound out of the exhaust sounding like a miss just wanted to make sure other people have experienced the same after prolonged sitting of the car without being started. It felt like and issue had with a car that had a leaking head gasket and would miss until the coolant burned off.

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Old 08-06-2009, 04:54 PM   #4 (permalink)
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Date registered: Jun 2009
Vehicle: 2005 C230K sport coupe
Location: Dallas, PA
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What is the milage on the car. The M271 engine has a history of the timing chain streching around 60K miles. The knocking sound could be the chain ratteling untill the tensioner can catch up. The tensioner works on oil pressure. I have this on my '05 Coupe, I'm waiting to have the chain replaced in the next week or two.
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Old 08-07-2009, 03:08 PM   #5 (permalink)
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Date registered: Jun 2009
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The car has only 38K miles on it. I hope I don't have to worry about the chain being stretched this early in the game.
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Old 08-07-2009, 06:07 PM   #6 (permalink)
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Vehicle: 2005 C230K sport coupe
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No, I think you can rule out that possibility at such low milage. I don't have any other suggestions at this time. I haven't heard of the head gaskets being a problem on these engines. At 38K I would suspect an electrical malfunction causing the miss but that will usually set a code.
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Old 08-08-2009, 09:37 AM   #7 (permalink)
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Date registered: Jun 2009
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I think I'll just keep an eye on it. Warranty is up in December so I have a little time if I think it is a problem to get it looked at. We are going on vacation Monday so the car will sit for 6 days without being started, I'll see how it acts.
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