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 08-14-2007, 08:26 AM
Registered User
 
Join Date: Oct 2005
Posts: 158
Engine missing when idling - 380sl

I've got a 84 380sl which is missing when idling once the engine is warmed up. It seems to be getting progressively worse this summer. Pulled the plugs and they are clean. I'm getting good gas mileage (22-23 mpg on the last two tanks). And when I'm driving the car appears to be running okay (can't feel it missing). It's only when I'm at stoplights that I feel the engine stumbling or missing. There are no problems getting underway once the light changes. Idling rpms are around 5-600 at idle and if I put it in neutral the symptoms diminish as the idling increases to about 650 rpm. The stumbling or missing does not appear to be happening when the engine is cold. Anybody have any ideas on what the issue might be?

Reply With Quote
  #2  
Old 08-14-2007, 12:08 PM
Super Moderator
 
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
Possibilies -

Vacuum leak - did the economy gauge reading at idle in gear change recently?
Injector seals
One or two weak or dirty injectors

My suggestions:

Check all vacuum fittings and connectors for leaks
Plug the cabin vacuum/AC line at the back of the engine and see if that makes a difference.
See if your booster holds vacuum - let the car sit for an hour, unscrew the the hose fitting, and see it you get a hiss from remaining vacuum
Pull the injectors out, have someone test/clean them, and put them back in with new seals.
__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
Reply With Quote
  #3  
Old 08-14-2007, 12:26 PM
Registered User
 
Join Date: Oct 2005
Posts: 158
No recent change to the vacumn guage was noticed. I'm leaning toward the ijector theory myself. At 140K they probaby need cleaning and replacing anyways.

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 06:52 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, 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