Idle drop - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 08-31-2009, 03:47 PM Thread Starter
BenzWorld Newbie
Date registered: May 2008
Posts: 3
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Cool Idle drop

I have a 1988 260E with 290,000 miles. Replaced nearly everything under the hood; most recent being a fuel distributor, fuel pump relay; other relays and calibrated the air flow meter. After car has been operating for a half hour, then stopped at a light, the idle will raise 100 RPM, then drop 200 RPM, recover, and go thru the same cycle until I accelerate from the intersection.

Also, engine requires lots of revs to re-start after being hot.

Mark is offline  
Sponsored Links
post #2 of 3 (permalink) Old 08-31-2009, 06:38 PM
Supporting Vendor
FCP Euro's Avatar
Date registered: Jul 2008
Posts: 736
Mentioned: 0 Post(s)
Quoted: 23 Post(s)
Sounds like a Fuel Pressure Regulator issue.

Quality & Service, Guaranteed for Life
FCP Euro - OEM & Genuine European Auto Parts Online
FCP Euro is offline  
post #3 of 3 (permalink) Old 09-01-2009, 03:22 PM Thread Starter
BenzWorld Newbie
Date registered: May 2008
Posts: 3
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
That's very possible. I look into it. Thanks. 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
    Poor idle, sluggish acceleration ---> good idle & smooth acc ltooz W201 190-Class 34 12-30-2016 03:40 PM
    Hard start (esp. when Cold), low idle-- Idle Control Valve? Erwin8r W124 E,CE,D,TD Class 17 08-31-2012 09:22 AM
    To Drop or Not to Drop To Flare or Not to Flare Decisions and also a little problem! pants123 W164 M-Class 10 06-17-2009 10:09 AM
    Idle drop when aux fan starts triskaideka W210 E-Class 2 06-08-2009 06:20 AM
    380SLC low RPM drop in idle - video mbenzfan79 R/C107 SL/SLC Class 6 02-15-2008 05:47 AM

    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