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 06-21-2010, 02:18 AM
mbzman's Avatar
Registered User
 
Join Date: Nov 2008
Location: Canada
Posts: 600
Lean fuel mixture when cold

What would cause a lean fuel mixture when cold? I feel a slight hesitation when taking off with the engine cold. It feels very sluggish off the line. I have already replaced the leaking EHA and checked the duty cycle. I measured a reading of 55%. The fuel pressure regulator has also been replaced. How should a new EHA valve be adjusted?

__________________
1989 300CE
Reply With Quote
  #2  
Old 06-21-2010, 02:23 AM
ps2cho's Avatar
Registered User
 
Join Date: Jun 2006
Location: Chandler, Arizona
Posts: 3,523
55% is showing the system is compensating correctly. Do not adjust it. I would check to make sure no vacuum leaks anywhere which would give the reason why the system is adding the extra fuel.
__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
Reply With Quote
  #3  
Old 06-21-2010, 02:29 AM
mbzman's Avatar
Registered User
 
Join Date: Nov 2008
Location: Canada
Posts: 600
I should also add that I checked the duty cycle with the air cleaner off. Does this make a difference to readings? I'm still battling a slight uneven idle. I don't really know what else to check. What is the best way to check for vacuum leaks? The IAC hoses look okay and I've already checked the IAC valve to make sure it was clean. There was no buildup inside and the valve operated freely. I think my next step is to make a code reader and check to see if there are any stored fault codes.
__________________
1989 300CE
Reply With Quote
  #4  
Old 06-21-2010, 11:46 AM
mak mak is offline
mark
 
Join Date: Jul 2006
Location: Westfeld .
Posts: 687
Also check the for correct voltage at the 3 pin connector for air flow potentiometer .front side of fuel distributor.
mak

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 04:41 PM.


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