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 11-17-2005, 07:38 AM
Registered User
 
Join Date: Sep 2003
Location: Norway
Posts: 12
260E - hesitation

I have had this problem a while, but will try to find out what causes it.

When the engine is cold it runs fine.
It is always OK at idle.

When I accellerate the engine often hesitate. Specially at 30-80 km/t. It acelerates, but it has not got the power it should have.
If I not push the pedal so much, it will accellerate better!! If I push the padal more again, it hesitates. During this hesitation another sound is coming from the engine. Not a bad sound, but a different sound. All cylinders are working. It runs smooth even when it hesitates. Only loss of power.

With full throttle / kickdown, the accelleration is just fine.

The mixture is OK, duty cycle OK, new o2 sensor, new fuel-pump relay, new injectors, no vacuum leaks.

I have read some threads about replacing the airflow potentiometer.
Do you think this will do?
Or is it the EHA which "control" this?

Any help will be appreciated.

Grueng

Reply With Quote
  #2  
Old 11-17-2005, 02:27 PM
neanderthal's Avatar
Registered User
 
Join Date: Feb 2004
Posts: 541
mine had a hesitation/ misfire under load (hills, acceleration etc) it needed new spark plug wires.
__________________
'O=00=O'
bmw 2002.
long live the legend
Reply With Quote
  #3  
Old 11-17-2005, 03:03 PM
Registered User
 
Join Date: Jun 1999
Location: Albuquerque, NM USA
Posts: 1,947
Quote:
Originally Posted by grueng
I have read some threads about replacing the airflow potentiometer.
Do you think this will do?
Or is it the EHA which "control" this?
EHA must be fine, but purpose of potentiometer is to indicate need for extra fuel when accelerating when engine is cold.
__________________
Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles
Reply With Quote
  #4  
Old 11-21-2005, 05:16 AM
Registered User
 
Join Date: Sep 2003
Location: Norway
Posts: 12
I have this weekend inspected the airflow potensiometer.
It looks fine and there is minimal wear on the contact-surface.
Resistance in ohm when pushing down the plate seems also OK.

Is it possible that the EHA-regulator can couse this problem?
If so, maybe I can try with a part from another car.

Grueng
Reply With Quote
  #5  
Old 11-21-2005, 09:16 AM
Registered User
 
Join Date: Jul 2001
Location: SoCal
Posts: 1,303
Make sure the airflow meter pot is re-installed in the same exact orientation. Problems with this item most likely to manifest at/near idle. Enrichment needed at speed is less than at idle, but fuel flow is much greater. For this reason I would check on fuel supply, e.g. weak pump. Other than fuel, ignition advance, exhaust restriction, air restriction (e.g. clogged filter) are all possibilities.

Steve
__________________
'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
Reply With Quote
  #6  
Old 11-21-2005, 01:15 PM
Registered User
 
Join Date: Sep 2003
Location: Norway
Posts: 12
I marked the position before removing it.

Here is a picture of the pot-meter attatched:
Attached Thumbnails
260E - hesitation-resize-img_6380.jpg  

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 02:59 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, 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