Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 05-20-2002, 02:14 PM
Registered User
Join Date: Mar 2002
Location: Oklahoma, U.S.A.
Posts: 34
Intermittent Rough Operation

I would appreciate suggestions as to next diagnostic steps with which to pinpoint a problem I am having with intermittent rough engine operation on my 1983 240D with manual transmission (204K miles).

Most of the time it runs fine with its typical nice muffled diesel engine sound and smooth performance. However, about 15% of the time, it will idle and run rough and louder from initial starting and will continue that way, with poorer performance, throughout the entire time the engine is operating until it is shut down. I have observed that a change of state, i.e. from good to bad or the reverse, never occurs during the time the engine is operating and also that once the condition occurs during a start and operation, it is likely to exhibit the same condition during subsequent starts and operations during that same day. The next days initial start is most likely OK (~85%). I have verified that the intake manifold butterfly valve is operating smoothly and is not sticking closed or open. All of the mechanical throttle/linkage seems to be operating freely. I have recently renewed the fuel pre-filter and filter and do not notice any fuel flow starving at the pre-filter. Does the intermittent occurrence and the nature of the problem suggest a vacuum issue -- pump, valve, lines, etc.?

Reply With Quote
Old 05-21-2002, 12:23 AM
Registered User
Join Date: Apr 2000
Posts: 412
My suggestion is that there is debris in the fuel tank. Debris may settle and mess with the fuel screen in the tank. Then rest on the bottom of the tank until it is stirred up again to mess with you. Hope you find the problem.
I don't know that much about diesels but have seen the problem on older cars.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
Reply With Quote
Old 05-21-2002, 09:38 AM
Registered User
Join Date: Mar 2002
Location: Oklahoma, U.S.A.
Posts: 34
JDUB, Thanks for the reply. MCCAN in the Diesel section of this forum also suggested that the problem might be in contaminated fuel. I plan to observe the condition carefully if and when it occurs again to see how it relates to time, fuel adds, etc.
Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 05:08 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page