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 10-04-2009, 10:40 PM
PanzerSD's Avatar
Schießenstern
 
Join Date: Jan 2006
Location: Saskatchewan Canada
Posts: 2,351
Question Engine Symptoms

I'd appreciate anyone's thoughts on this please!


1978 450 SEL M117.986 EGR disconnected

What symptoms could arise from having one or more faulty components?

I am currently experiencing the following:

An occasional miss at idle

When taking off from a dead stop, it hesitates really bad an misses a few times and misses till It's up around 1500RPM. Makes merging and taking off long and arduous. No backfiring, no smoke. Just a miss and no power.
Once I get thru that i have all the power I need till I come to a stop again.

Starts in 1st gear, (goes thru it's stumble)
Shifts to 2nd, and hold's 2nd till, on my speedo is about 43KmH but in reality I'm moving at about 50Kmh at that point
Flares into third.

In my city the major speed limit is 50kmh so driving around town in second gear doesn't cut it for me. Surely to god it should be in third gear closer to 45kmh.

Disconnect Modulator, and same shift gap but no flare. Bad Modulator? I have bypassed the vacuum source to my own known good vac source.
I used plastic airline that is used in air springs (cuz it was what I had on hand)

The inside diameter is at least twice if not three times larger than the hard line that originally fed the modulator, could this allow TOO much vacuum to get to the modulator?

Thanks guys!

__________________
RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)

____________________________
FACEBOOK:
PANZER450
Reply With Quote
  #2  
Old 10-05-2009, 08:18 AM
LarryBible
Guest
 
Posts: n/a
You have a vacuum leak of some description. It is possible that the EGR valve is the source of the leak, not the vacuum line to the valve, but the pintle portion of the valve that allows exhaust gas into the intake.

Connect a vacuum gauge to confirm that there is a vacuum leak, and if so, find it.

My $0.02,

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 10:40 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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