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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-07-2000, 03:26 AM
300EVIL's Avatar
Moderator Incarnate
 
Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
I HAVE A 300E THAT RUNS OK EXEPT FOR A SLIGHTLY ROUGH IDLE , A DELAY ON TAKE OFF AND A NOTICEABLE AMOUNT OF HORSEPOWER LOSS.
WHATS WIERD IS IF YOU LET THE CAR SIT FOR A DAY EVERYTHING WORKS GREAT TILL THE NEXT DAY
I TESTED THE THEORY AGAIN AND DIDNT USE IT FOR 4 DAYS. IT WAS 50 DEGREES OUTSIDE WHEN I STARTED IT AND ALL I HAD TO DO WAS TAP THE IGNITION AND IT STARTED RIGHT UP! USUALLY IT TAKES A RETRY OR AT LEAST TWO SECONDS BEFORE IT WILL IGNITE. I HOPE THAT THE INFO GIVEN WILL BE ENOUGH FOR A REASONABLE EXPLANATION.
ANY RESPONCE WILL BE GREATELY EPRECIATED.
THANKS,
ADAM
Reply With Quote
  #2  
Old 09-07-2000, 09:04 PM
Registered User
 
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Two things to check here. Well three. Check the over-voltage relay, the ignition coil, and the EHA

------------------
Benzmac:
Donnie Drummonds
300E
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
Reply With Quote
  #3  
Old 09-08-2000, 12:34 AM
300EVIL's Avatar
Moderator Incarnate
 
Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
EHA? WHATS THAT, THE COMPUTER?
Reply With Quote
  #4  
Old 09-09-2000, 07:08 PM
300EVIL's Avatar
Moderator Incarnate
 
Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
HUH, HELP PLEASE!
Reply With Quote
  #5  
Old 09-09-2000, 07:51 PM
Registered User
 
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Adam, EHA stands for Electro Hydraulic Actuator. This is the critter that looks like an octopus to the left front of your throttle body. Has lines coming out for all the injectors. It basically is a fuel metering device which responds to inputs from various systems and provides the correct amount of fuel to the injectors based on the current operating profile generated by the engine (motor!! )management system. Can be the root of all evil, but generally reliable given it's complex function.

------------------
Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE
Reply With Quote
  #6  
Old 09-09-2000, 07:59 PM
300EVIL's Avatar
Moderator Incarnate
 
Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
CAN THE EHA BE REBUILT OR DOSE IT HAVE TO BE REPLACED I KNOW THIER ABOUT $500 BUCKS.
Reply With Quote
  #7  
Old 09-09-2000, 08:23 PM
Registered User
 
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
You can get a rebuilt, or you can buy new. Make sure that's the problem first. Eliminate the first two Donnie mentioned, coil and OVP relay. As he stated the EHA was the last on the list.

------------------
Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE
Reply With Quote
  #8  
Old 09-09-2000, 08:48 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Jeff, your description applies to the fuel distributor not the EHA. The EHA is a black plastic chunk on the side of the fuel distributor. It isn't all that expensive and it also is not the problem usually even though its activity is critical for good drivability.

The EHA is a current controlled variable leak to the differential pressure of the fuel distributor. It is the sole vehicle for electronic fuel control. When it isn't functioning the car will hard cold start, have poor cold running characteristics and hesitate on sudden acceleration. The EHA's most common fault is leaking fuel.

One of the ways it fails could explain the original condition here. The device is known to loose its stability. It causes different pressure drops for the amount of current used to control. This causes fluctuating mixtures.

[This message has been edited by stevebfl (edited 09-09-2000).]
Reply With Quote
  #9  
Old 09-09-2000, 08:58 PM
Registered User
 
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
See, and I thought that thing was all one big chunk of expensive MBZ engineering. Thanks Steve. As I have always said of this board and of you and Donnie in particular, there isn't a day that goes by that I don't learn something about our beloved Benzes. Keep sending the good stuff. Anyway, Adam, try the other stuff that Donnie mentioned first..

------------------
Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Turn signal problem on 89 300E Takedown Tech Help 8 08-29-2004 11:54 AM
wierd window problem Benz300 Tech Help 1 07-08-2003 11:52 AM
Wierd electrical problem (300E, W124) Crowe Tech Help 12 08-14-2002 04:10 AM
Solution to my 87 300E flooding problem jrodimer Tech Help 2 02-19-2002 01:09 PM
Starting/Idling problem on non-U.S. model 300e rbdrost Tech Help 2 02-13-2001 08:42 AM



All times are GMT -4. The time now is 02:46 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, 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