73' 350SL Cold Idle Surge - Mercedes-Benz Forum

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 12-19-2010, 10:31 PM Thread Starter
BenzWorld Newbie
 
Date registered: Dec 2010
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
73' 350SL Cold Idle Surge

I have a 73' 350SL (3.5 gray market) that has always surged at idle cold, then smooth warm. Aux. air valve is functioning creating high idle, then it lopes or surges like its lean. Checked coolant sensor - ok. Don't know what else it can be. Help
hpranch is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 12-20-2010, 12:32 AM
BenzWorld Elite
 
Grubeguy's Avatar
 
Date registered: Jan 2006
Vehicle: 73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
Location: DC Area
Posts: 2,110
Mentioned: 1 Post(s)
Quoted: 97 Post(s)
Send a message via MSN to Grubeguy Send a message via Yahoo to Grubeguy
I had the same issue with my 4.5. I replaced all the vacuum lines and solved the issue... Those plastic lines are available at a local parts store. If you go down this route, be sure to replace the rubber connector bits as well. They often crack with age.
Grubeguy is offline  
post #3 of 3 (permalink) Old 12-20-2010, 07:48 PM
BenzWorld Member
 
unimoged's Avatar
 
Date registered: Dec 2008
Vehicle: 2004 S500. 2000 CLK430 Cab, 1999 C43 AMG. 1999 S500. 1999 S320. 1977 230 4 spd, 1972 280SEL 4.5
Location: Charlotte NC
Posts: 185
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Also, make sure that the throttle position sensor is functioning properly. You should be able to hear it click when the throttle is released from a very slight opening.
unimoged is offline  
Sponsored Links
Advertisement
 
Reply

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

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in











  • 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
    74 450sl cold idle surge wvbenz R/C107 SL/SLC Class 5 09-30-2010 05:42 PM
    cold start surge hoot8mon W211 E-Class 0 02-20-2008 11:15 AM
    Idle surge Fernandez W124 E,CE,D,TD Class 22 09-04-2007 10:00 AM
    Idle surge !!! Leester R129 SL-Class 2 04-06-2007 10:33 PM
    throttle surge when cold? baudenfj General Mercedes-Benz 3 12-16-2005 10:41 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

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