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 10-20-2011, 04:11 PM
LandYaghtLover's Avatar
Registered User
 
Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
W126 560 Cold performance issue...

I had this same issue last fall/winter. Then spring brought warmer temperatures and I forgot about it. Over summer the car ran well and I found some small issues. Economy and performance are way up from when I first had the car.

Then it got cold here.

The same issue is back. The car feels like its hanging onto gear changes too long. Or it feels like the timing is being held back. At high RMP, just before a shift, I can feel surging. Feels like the trans is slipping. Its very, very annoying. the car simply feels "wrong".

The odd thing is that most of the time I can just restart the car and its find. Even if I dont let it warm up much at all. I can get in, fire it up, back out and restart and I usually dont have the issue. If I do not restart, I will 99% of the time. Or if I stomp on it hard, it may then act normal again. But not always doing that and I dont like doing it.

There must be something related to temperature that sticks open/closed. My thought it something that may be vacuum related, hence restarting drops vacuum for enough time to reset it. Or getting the RMP way up sometimes helps.

Really clueless on this one. I just dont want to go through another winter like this. Ideas?

__________________
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
Reply With Quote
  #2  
Old 10-20-2011, 04:48 PM
Registered User
 
Join Date: Sep 2004
Location: DFW / Collin County Texas
Posts: 1,882
How are the vacuum modulator and bowden cable for the tranny?
__________________
08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280
Reply With Quote
  #3  
Old 10-20-2011, 04:57 PM
LandYaghtLover's Avatar
Registered User
 
Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
Bowden cable seems okay. Shifts seem to be when they should be. But I have no other Benz to compare. The modulator was replaced last fall and the vac line to it was replaced by the PO, so its also fairly new.
__________________
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
Reply With Quote
  #4  
Old 10-20-2011, 06:42 PM
Registered User
 
Join Date: Dec 2001
Location: LaPorte, IN
Posts: 400
That sounds familiar from my 560sel, but i can't visualize what i was working on and thought solved it--cold start valve?? Cylindrical thing in front of the air cleaner housing if i recall correctly. Might not have been it at all...sorry.

But...in the fall/winter in all our vehicles over the past several years, we've dropped performance and fuel economy. I've heard rumors of "winter formulation" gasoline, perhaps with a touch of alcohol, but have not been able to verify that. I can say that in the winter months if i put a bottle of Techron in a fill-up it makes my car run like it's spring-time.

Good luck!!

__________________
Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)
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 06:56 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page