Missing on idle 320SL R129 - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 01-18-2007, 12:24 AM Thread Starter
BenzWorld Newbie
Date registered: Jan 2007
Vehicle: '92 SL320, '94 E220 Coupe, '77 SL450, '00 C180, '97 Ford Mondeo, '73 Morris Marina!!
Location: London, UK
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Missing on idle 320SL R129

I would be very grateful to recieive any ideas on the following problem.

The car is a 1992 R129 320SL. It idles and runs perfectly except for an intermittant fault. When warm (after 5 mins) it may missfire at idle or at low revs (ie in traffic or stationary). When the revs rise it will clear itself and will run fine at higher revs on the motorway.

The misfire is a random blip down on the revs..... not unstable idle or high revving.... otherwise the idle is stable the rest of the time.

I have started by changing the plugs (and gapped them properly), new plug leads, and distributor cap / rotar arm. This has made no difference, but the fualt is hard to find as it seems to disappear when the bonnet is lifted and the engine just idles fine!

I haven't yet tried changing the coil..... might this be a good next step?, or do you have any other ideas?.

Many thanks
Benzboxer is offline  
Sponsored Links
post #2 of 2 (permalink) Old 02-11-2010, 10:13 AM
BenzWorld Newbie
Date registered: Feb 2010
Posts: 2
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
missfire problem

i had a similar problem with a 1995 s500.the missfire happened only when the engine warmed up.the problem was caused by the two distributors.they were almost wet from damp and condensation.when they were dried out the engine
ran perfectly.i never found out what caused the problem in the first place.i hope this helps.

regards;boris yadek.
borisyadek is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode

    Similar Threads
    Topic Author Forum Replies Last Post
    high idle am i missing something Naomilla2.0 W126 S,SE,SEC,SEL,SD,SDL Class 11 03-28-2012 02:20 PM
    1977 450SLC rough Idle and Missing - HELP PLEASE finleymac R/C107 SL/SLC Class 11 09-29-2008 06:48 AM
    Need to find missing part of my idle control Cyberbach W123 E,CE,D,CD,TD,TE Class 10 06-08-2006 03:39 PM
    Pinging-Shuddering-Missing@idle KMX3060 W126 S,SE,SEC,SEL,SD,SDL Class 2 08-10-2004 08:01 PM
    320sl questions Guest (MBNZ) R129 SL-Class 2 04-19-2001 08:34 PM

    Posting Rules  
    You may post new threads
    You may 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 Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On


    Title goes here

    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome