Rough Idle when coming to a stop

Mar 29, 2009 | 05:03 PM

imolas54

Thread Starter

Junior Member

Joined: Dec 2008

Posts: 70

Likes: 3

From: Long Island

G550

Rough Idle when coming to a stop

does it once in a while when i come to a stop at red light, the idle is very rough to the point the car is shaking. If i remove the brakes and step on it again, the idle turns normal.
As my car is out of warranty, i was wondering if you guys would know what needs to replaced so i can do the work myself.
It's a 2005 E500 4Matic.
Thank you in advance for your assistance.
T

Mar 29, 2009 | 05:17 PM

MarcusF

MBWorld Fanatic!

Joined: Apr 2005

Posts: 3,784

Likes: 84

From: SCV SoCal

2002 CLK430

The last time that happened to me, the air cleaner wasn't making a good seal around the MAF. I just had reseat it. Hopefully you're as fortunate.

Mar 30, 2009 | 09:48 AM

vettdvr

MBWorld Fanatic!

Joined: Mar 2006

Posts: 3,254

Likes: 15

From: Louisiana

03 E500 and Corvette

Quote:

Originally Posted by imolas54

Interesting. I am having the same issue. I thought it was plugs so I put in 16 new OEM MB plugs. Same issue. Not all the time but occasionally it will idle rough. I am open to ideas also!

Mar 30, 2009 | 10:08 AM

Benz-O-Rama

MBWorld Fanatic!

Joined: Apr 2006

Posts: 8,137

Likes: 27

From: Maryland

Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon

Quote:

Originally Posted by vettdvr

Interesting. I am having the same issue. I thought it was plugs so I put in 16 new OEM MB plugs. Same issue. Not all the time but occasionally it will idle rough. I am open to ideas also!

I think you have a faulty MAF sensor. Seems like I've been talking about MAFs a lot lately, and with good reason. My car's power delivery didn't feel as smooth as in years past, plus a recent trip to a drag strip showed that my car was down on power from last year. I replaced my MAF 2 days ago and it appears that all my problems are gone. Car idles smooth, power delivery feels more linear and my SOTP dyno feels like the power has returned.

Change your MAF. I found one on ebay for 135.00. And this is the mack daddy Bosch one.

http://cgi.ebay.com/ebaymotors/ws/eB...3AIT&viewitem=

Good luck, gents.

Mar 30, 2009 | 12:58 PM

lkchris

MBWorld Fanatic!

Joined: Sep 2005

Posts: 6,192

Likes: 242

From: Albuquerque

'10 CL550, '12 GL550

Classic symptom of failed/failing crankshaft position sensor.

This failure usually does not set a check engine light

Mar 30, 2009 | 03:28 PM

Benz-O-Rama

MBWorld Fanatic!

Joined: Apr 2006

Posts: 8,137

Likes: 27

From: Maryland

Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon

Quote:

Originally Posted by lkchris

Classic symptom of failed/failing crankshaft position sensor.

This failure usually does not set a check engine light

Damn! Yep, forgot about that one. I think he may be right.

Mar 30, 2009 | 06:29 PM

imolas54

Thread Starter

Junior Member

Joined: Dec 2008

Posts: 70

Likes: 3

From: Long Island

G550

anyone have the part number for the crank shaft position sensor?

TIA

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Apr 15, 2009 | 09:12 PM

Clinton Horn

Senior Member

Joined: Sep 2006

Posts: 413

Likes: 3

2003 E320

Rough Idle

Quote:

Originally Posted by MarcusF

The last time that happened to me, the air cleaner wasn't making a good seal around the MAF. I just had reseat it. Hopefully you're as fortunate.

Thanks about $400 dollars worth. The car was very rough when coming to a hard stop. I checked the Air cleaner housing and the back two clamps were unseated. I was in the process of trying to locate the crankshaft positioning sensor (it is buried). This timely piece of information saved me an hour of skinned knuckles and a perfectly good part in the trash.
I REALLY appreciate the information.

In spite of arguments about the trunk jack and hub centered wheels (not), the information I have gathered here from people who actually KNOW what they are talking about is invaluable. My owner's experience has been enriched beyond my expectations due to great advice like this.