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 09-28-2016, 12:50 PM
Registered User
 
Join Date: May 2008
Location: Chesepeake & North Jersey
Posts: 308
1984 500SE Gray Market running rich.

I have been away from the web forums for 5 years now and came back because I am having a emissions problem with my '84 500SE. Being a Gray market import, I know this car will not run as a LEV or close to it but enough to atleast not smell like a spent refinery when going down the road and getting less than 10mpg. I have done the basic maintenance and chain was done years ago. I have also had the top ends emissions cleanout service.. Where else do I look? EGR valves on the manifold? Coolant temp sensor?

Any help would be great.

Cheers.

__________________
"Why operate within the law when you can operate above it?"

MB roster
'85 500SE euro Ratrod
'92 500E's x2 / '94 E500 stored
'91 560SEC w/43K stored
'92 Cabby 16V OE 2.1 AutoX car
JDM RHD cars now.
Reply With Quote
  #2  
Old 09-28-2016, 02:04 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 2,961
ff:

1) Ensure that the ignition system is in top condition; plugs, wires, cap, rotor, & timing (including full advance).

2) Ensure that the Control Pressure Regulator (aka: Warm Up Regulator/WUR) is heating properly, and that control pressure is rising with temperature.

3) If equipped with an O2 sensor (and therefore feedback control of mixture), make certain that all the components (O2 sensor, controller, frequency valve) are functioning.
Reply With Quote
  #3  
Old 10-07-2016, 05:27 PM
Administrator
 
Join Date: Mar 2016
Location: Los Angeles, CA
Posts: 1,816
Quote:
Originally Posted by Frank Reiner View Post
ff:

1) Ensure that the ignition system is in top condition; plugs, wires, cap, rotor, & timing (including full advance).

2) Ensure that the Control Pressure Regulator (aka: Warm Up Regulator/WUR) is heating properly, and that control pressure is rising with temperature.

3) If equipped with an O2 sensor (and therefore feedback control of mixture), make certain that all the components (O2 sensor, controller, frequency valve) are functioning.

Great advice Frank! Thanks for helping out.

-Dmitry
Reply With Quote
  #4  
Old 10-08-2016, 12:07 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 5,186
Adding to this, check the vacuum lines, especially the little rubber bits that connect everything together. As these engines rely on vacuum changes to adjust the mixture, vacuum leaks can cause some strange issues. If you haven't changed the vacuum boots and you don't know when they were last done, replace them. Cheap parts, doesn't take long to do, and you'll notice an improvement, whether or not it's the sole cause of your running issues.

It is also worth mentioning that you can adjust the overall fuel mixture by adjusting the screw in the center of the air cleaner. I forget the size, I think it's a 3mm allen. With the engine off, push it straight down and feel for it to engage the adjustment head. The part you insert the allen into is spring loaded, you'll feel it drop down and "grab" the head below. Make TINY adjustments. 1/16 of a turn at a time. CCW should be leaner, CW richer.

Being a grey-market car, you won't have an O2 sensor.

__________________
'11 Honda Accord EX - "The Daily" 70K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "Diseasel Jr." 173K
'94 BMW 525i - "The Red Car" 180k
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 08:38 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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