Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-21-2014, 02:10 PM
gts gts is offline
Registered User
 
Join Date: Oct 2014
Posts: 1
Talking 91 r129 500sl rough idle issues

Hi I am new to this forum as I have just purchesed my first mercedes and I am having some issues with the car at start up and at idle. the car takes a moment on cold start but starts fine once warmed up but the idle is rough and remains rough at all times.can any one give me some direction I have replaced the.
plugs
wires
caps
and rotor buttons.
thought about idle air control valve but dont want to throw parts at it as we know they are not cheap Thanks Bill

Reply With Quote
  #2  
Old 10-21-2014, 07:47 PM
engatwork's Avatar
busy
 
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,266
I would start by checking for vacuum leaks.
__________________
Jim
Reply With Quote
  #3  
Old 10-23-2014, 10:48 AM
Registered User
 
Join Date: Jul 2008
Posts: 1,236
Quote:
Originally Posted by engatwork View Post
I would start by checking for vacuum leaks.
For sure. Check all the vacuum hoses, and also, the rubber air intake plenum between the air meter and the manifold, and the injector cup seals. Those are all places known to be likely causes of a vacuum leak. If you rule out vacuum leaks, you might have a dribbling injector or two.

Have you done a compression test on the motor yet? Are all eight cylinders in spec?

__________________
-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 03:09 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page