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 01-27-2007, 12:12 PM
Registered User
 
Join Date: Jan 2003
Posts: 13
Unhappy 93' 190E 2.3L hesitation/stumbling

I purchased this 1993 2.3L car 123K miles. Here are the conditions:

When first started and cold the idle is great very little or no stumble on take off. If driven on the freeway (warm to hot) then the idle will start to wander (good a few seconds then drops for a second) when you city drive at stop signs (like a miss and giving throttle at idle doesn’t always correct it)(sometimes it idles just fine and only has the stumble on take off?)

Once warmed the hesitation/stumbling usually gets a little worse off the line. Never stalls but acts like a miss and misses more when you first take off hard again (still in that 1000-1500rpm range.) Afetr 2000rpm it drives well and always cruises great at any speed.

Occasionally when under full throttle on a down shift the engine seems to go flat around 4000rpm and just hangs in 3rd gear until you let up the throttle and it up shifts to 4th and you have power again. That seems to be better since the vacuum lines were replaced to and from the idle speed seloniod.

Any ideas for this vintage CIS Mercedes? Thanks

Reply With Quote
  #2  
Old 01-27-2007, 12:20 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
might i suggest looking for additional vacuum leaks? I had some stumbling idle troubles (mostly when i was at a red light) and I discovered that I had inadvertently disconnected a vacuum line at the EGR and not plugged it up. Check into your system and see if there any leaks. i've heard that the m103s dont like them at all, I dont imagine the m102s like them anymore

-Kris
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
Reply With Quote
  #3  
Old 01-27-2007, 02:23 PM
Registered User
 
Join Date: Jan 2003
Posts: 13
I agree - continue looking for vacuum leaks. The vacuum bounce at 15-16" at idle and drops to 13-14" when put into gear (measured at ignition control vacuum port with tee connection). Anyone know what is common to these cars for leaks? EGR replaced with leak. Transmission modulator checked. Rubber U shaped tubing under plastic intake box to idle speed seloniod replaced, rubber tubes from same seloniod to valve cover & air cleaner replaced.
Reply With Quote
  #4  
Old 01-27-2007, 06:59 PM
Registered User
 
Join Date: Jan 2003
Posts: 13
Well the vacuum was low due to the air fuel mixture being misadjusted. I had fixed all the leaks prior and was chasing ghosts. Adjusted the air sensor for peak vacuum at idle and got back to 20" at idle. Now I have a smooth idle. Still has a bit of stumble off the line but obviously not nearly as bad. Must be some thing else to get it to accelerate better from 1000 rpm to 1500rpm.m Maybe it is a simple as timing?

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 12:50 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