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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-16-2006, 03:46 PM
pizzaman
 
Join Date: Nov 2005
Location: Belmont, ny
Posts: 13
81 300 D idling rough

I have had two 300D s and both of them idle rough. The first one got smashed up before I could try to figure it out. I was wondering if this is the nature of the beast as a friend of mine has an 84 300td and an 85 300td and they both idle rough too. Once you step on the pedal on any of these cars they smooth right out. You can actually feel the car "surging" when you are at a stoplight in gear with the brakes on. Any thoughts?

Reply With Quote
  #2  
Old 10-17-2006, 12:30 PM
Running on pure optimism.
 
Join Date: Aug 2006
Location: Philadelphia, PA
Posts: 222
You may want to try...

a diesel purge, if you haven't done that yet. Diesel Giant sells a complete kit to do it on his website, http://dieselgiant.com/diesel_parts_for_sale.htm

But that's just basic maintenance that's supposed to help with knocking and nailing and increasing hp. Any mechanical fix is beyond me...
__________________
1983 MB 300SD Turbo Diesel
Reply With Quote
  #3  
Old 10-17-2006, 01:34 PM
Registered User
 
Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,166
Search..........

Diesel Purge
Valve Adjustment
Engine Mounts or Motor Mounts
Rack Dampner Screw
Italian Tune-up

No it is not the nature of this engine to idle roughly.
__________________
Sam

84 300SD 350K+ miles ( Blue Belle )
Reply With Quote
  #4  
Old 10-17-2006, 01:37 PM
KCM KCM is offline
Registered User
 
Join Date: Jan 2004
Posts: 625
I've wondered the same about the idling. My 1980 idles rough too, even after a complete engine rebuild including new nozzle tips, everything except a pump rebuild. Don't have the surging though. I just assumed that is the nature of the 5-cylinders. It too smooths out nice when it is opened up a little.

You might want to check out the throttle linkage adjustment as far as the surging. On my '80 it has the vacuum bleed-off valve on top of the valve cover. This is suppose to keep the transmission in 2nd gear at idle. Might be adjusted wrong and shifting into 1st.
Reply With Quote
  #5  
Old 10-17-2006, 01:38 PM
KCM KCM is offline
Registered User
 
Join Date: Jan 2004
Posts: 625
Quote:
Originally Posted by SD Blue View Post
Diesel Purge
Valve Adjustment
Engine Mounts or Motor Mounts
Rack Dampner Screw
Italian Tune-up

No it is not the nature of this engine to idle roughly.
Just saw your post. Non-turbos do not have the rack dampner screw, do they?

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 05:03 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