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  #1  
Old 02-23-2010, 10:00 PM
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Join Date: Feb 2010
Posts: 4
Rough and shaky idle on a 2002 SL500 (R129)... NEED HELP Please

My car is experiencing a periodic hesitation when accelerating from low revs.
It also idles rough and has a very noticeable shake when in park and drive.

It drives just fine, but when coming to a stop it starts to surge and when I come to a stop the rough/shaky idle starts up again.

I've already:
-installed 16 new spark plugs
-installed 8 new ignition coils
-replaced both motor mounts and trans mount
-removed and cleaned the TB
-checked all the hoses by the TB (all were connected and seemed fine)

Any help/assistance is greatly appreciated.

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  #2  
Old 02-23-2010, 10:07 PM
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My car also has an aftermarket supercharger and an adjustable Kleemann MAF clamp that was set at 597 omes. Tonight I adjusted it to the Kleemann's suggested setting of 475 but have yet to drive it to see if that helps or not.

Should I reset all of the adaptive values so the ECU to adjust to the new MAF setting?

Again any help is Greatly appreciated.
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  #3  
Old 02-24-2010, 08:06 AM
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Location: Tucker, Ga USA
Posts: 12,153
Re-adaption of the crank sensor will normally help that type of issue.

MB scanners have that provision.
You must drive at 2100rpm in 3rd gear for 30seconds with a 50% load.
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  #4  
Old 02-24-2010, 09:49 AM
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Thank you M.B.DOC.

I currently have a MEMOSCAN scanner, but it doesnt reset any of the ECU's adaptation. I can only reset error codes which I dont think will help me for this task.

Can you suggest an affordable MB scanner that will enable me to reset the appropriate values?

Will something like this do: http://cgi.ebay.com/ebaymotors/Mercedes-Benz-MB-diagnostic-scanner-with-multiplexer_W0QQcmdZViewItemQQhashZitem27ae1fe3d9QQitemZ170425050073QQptZMotorsQ5fAutomotiveQ5fTools
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  #5  
Old 02-24-2010, 11:19 AM
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If your canner has "live" data, drive the car watching the load at the above prescribed manner.
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ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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  #6  
Old 02-24-2010, 12:05 PM
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My scanner has live data, so I will do as you advised.
I didnt know you could re-adapt the values without having to reset them via DAS.

Please correct me if I'm wrong.


Last edited by Tech-Tune; 02-24-2010 at 12:18 PM.
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