Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 06-22-2000, 01:54 PM
Michael Bushnell
Posts: n/a
Well folks the solution to my idle problems escaped again. I have replaced the Idle Control Unit, the Cold Start Valve and the Idle Control Valve. I sent the Idle Control Unit back to the remanufacture company to be checked and they say it is working properly. With the little radio shack meter, the electricity in the harness has been checked. The feed to the Idle control unit shows hot at pin 2. It shows a good ground at pin 4. Pins 1 and 5 that go to the Idle Control valve have 10.4 ohms resistance. Pin 2 and 4 show 13.7 volts with the engine running. Pin 2 which is fed by the over voltage protection relay shows around 11.4 volts the same as pin 87 and 15 at the relay. Pin 8 shows voltage when cranking the engine. Pin 3 from the fuel pump shows voltage variances when accelerating the engine.
Vacuum leaks are not apparent, though I have not done a smoke test as suggested. Does anyone have an idea to make a smoke device to test for vacuum leaks? Where would one expect to find a leak that would make the Idle climb to 1500 RPM on startup?
The gas linkage is all greased up and nothing is sticking. The idle stop on the linkage is not hanging up. Any thoughts on how to trouble shoot this problem? The engine manual says to hear the Idle Valve click. I do not hear it click with the ignition going on. Yet the new and the old valves both click when checked directly to the battery. The wires to and from the valve to the control unit show continuity.
What do you think I am overlooking? Mike

1983 380SEC
1955 Porsche Speedster
Reply With Quote
Old 06-22-2000, 09:27 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Be sure the throttle valve switch is closed when it is at idle. This car does have an idle switch down there that tells it to idle.

An ohm reading of the wire is a static test. I like to check them dynamicly (sp?) or when in use.

Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
82 300D Idle Problems? openback Diesel Discussion 1 01-21-2005 12:48 PM
380SE hard to start & idle problems psychoman Tech Help 2 08-24-2003 09:17 PM
Continuing idle problems and I'm starting to have MG flashbacks! Ron Brooks Tech Help 5 11-22-2002 04:02 AM
1994 C-220 Idle Problem and Wiring Problems Bill Driver Tech Help 1 11-11-2002 10:06 AM
Idle problems with 560 SL James L. Lloyd Tech Help 2 07-31-1999 07:19 PM

All times are GMT -4. The time now is 01:25 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page