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W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Cold Start

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Old Apr 25, 2006 | 08:46 PM
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Question Cold Start
I've noticed when the car sits overnight during part of the cold start cycle the engine idle gets a bit "lumpy" which kind of shakes the car a bit every few seconds or so then after a minute or two it idles very smoothly; is this normal with the 55?

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Old Apr 25, 2006 | 08:52 PM
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Originally Posted by RJC
I've noticed when the car sits overnight during part of the cold start cycle the engine idle gets a bit "lumpy" which kind of shakes the car a bit every few seconds or so then after a minute or two it idles very smoothly; is this normal with the 55?

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mine does the same thing - even before and after the K2 upgrade....
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Old Apr 25, 2006 | 08:59 PM
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Thanks! I feel alot better Is that a long or short hair Jack Russell in your avatar?
Last edited by RJC; Apr 25, 2006 at 09:06 PM.
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Old Apr 25, 2006 | 09:08 PM
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Diddo, mine also has a rough idle until warm-up!
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Old Apr 25, 2006 | 09:18 PM
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Mine does the same thing...
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Old Apr 25, 2006 | 10:17 PM
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Same with my car, so i let it idle until the temperature guage reaches a couple bars under the half line bar.
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Old Apr 25, 2006 | 11:19 PM
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You can thank CARB for your cold-start symptoms. Cold engines are set to run lean until the cat fires off. A lean-running engine will idle roughly.
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Old Apr 25, 2006 | 11:38 PM
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Mine does the same thing and never smooths out. But that's normal considering i'm running a set of K cams.
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Old Apr 25, 2006 | 11:57 PM
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From: 2000 ft over the FL coast in a B-17
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Thanks for all the feedback.

The reason I noticed this is I always let my cars idle down after a cold start before driving off; I've just never had one shake it up like this before. I also haven't heard of this problem with 2006 500's, 350's etc; maybe it's a 55 thing? If it is a 55 thing should n't MB provide a flash update for the ECU. Aren't cars allowed to run richer during the cold start cycle?
Last edited by RJC; Apr 26, 2006 at 12:13 AM.
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