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 08-31-2004, 01:36 AM
Registered User
 
Join Date: May 2001
Posts: 161
W140 95 S420 Has anyone notice this morning missing?

I have noticed several early morning start ups with annoying episodes of 10 seconds or so of engine missing. Sounds like rich running missing? I have become aware that missing don't always occur, only occuring on mornings when the car had been cold started and pulled it into the garage the night before. Car only allowed to run less than a minute when pulled into garage for the night. (not long enough to warm up).

My early theory is that the enrichment for the morning start is somehow being enriched TOO MUCH due to the cold start (but no warm up) 7 to 8 hours earlier when the car was put away in the garage for the night.
Does the enrichment start off with a base of wherever it LAST RAN ?
It is summer here now, 60F at night, but similar episodes have happened even when nightime temps were lower this past spring.

Anyone else have an idea?
70K miles, Car runs fine and does not show no other signs of trouble.
OK mileage (aggressive city use=16mpg; Highway, 70-80 mph cruise= 21mpg-22 w/o air)

DanielW
Reply With Quote
  #2  
Old 08-31-2004, 08:40 AM
Registered User
 
Join Date: Jun 2002
Location: Cumming Ga.
Posts: 295
Check your distributor caps and rotors. Sounds like the way one runs with corroded caps. If they look green inside they need to be replaced.
__________________
Mercedes Benz Master Tech
Reply With Quote
  #3  
Old 08-31-2004, 09:50 AM
s500
Guest
 
Posts: n/a
Every morning I have to start the car for 30 seconds to 1 minute to 'warm it up' or else the car goes very slow w/ high rpm until it has warmed up fully.
Reply With Quote
  #4  
Old 08-31-2004, 11:22 AM
Registered User
 
Join Date: Aug 2004
Location: KC, MO
Posts: 140
Quote:
Originally Posted by s500
Every morning I have to start the car for 30 seconds to 1 minute to 'warm it up' or else the car goes very slow w/ high rpm until it has warmed up fully.
You can consider your "problem" normal, as Mercedes has an upshift delay until the vehicle warms sufficiently, to increase effficiency by bringing the cats and O2 sensors up to temp faster.
__________________
Don't ask me, I'm a shop-owner by default
Reply With Quote
  #5  
Old 08-31-2004, 11:32 AM
s500
Guest
 
Posts: n/a
Quote:
Originally Posted by BenzRepair
You can consider your "problem" normal, as Mercedes has an upshift delay until the vehicle warms sufficiently, to increase effficiency by bringing the cats and O2 sensors up to temp faster.

thanks.. it only started happening recently...some mornings it will just take off and others i just wait for it to warm up..

also.. you have any opinion on this thread:

2 problems with my s500 that are ANNOYING!

its the locking problem.
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 12:09 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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