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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-10-2001, 11:49 PM
deansingh
Guest
 
Posts: n/a
Angry The engine continues to run after turning off the ignition.

I have Merceds 1987 190D 2.5 automobile. For the last month the engine continues to run for at least a minute after I turn off the ignition. Can I do something about it without taking it to the "Cleaner"?
Reply With Quote
  #2  
Old 11-10-2001, 11:57 PM
LarryBible
Guest
 
Posts: n/a
You have a vacuum leak. The engine is stopped by the application of vacuum to a diaphragm at the rear of the injection pump. Check your vacuum lines to the pump and make sure they're properly in place. From there work away from the pump, checking lines as you go.

I don't know about your particular model, but removing the oil filter at oil change time will result in vac lines knocked loose on the cars I've tinkered with.

Good luck,
Reply With Quote
  #3  
Old 11-10-2001, 11:58 PM
jbaj007's Avatar
Registered User
 
Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
You've got a vacuum leak somewhere. Check "search" and you'll find many who have passed this way before you. Round up the usual suspects first (old cracked rubber vac. hose connectors) then proceed from there.


Edit: Larry's quicker!
__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

Last edited by jbaj007; 11-11-2001 at 02:15 AM.
Reply With Quote
  #4  
Old 11-11-2001, 01:16 PM
Registered User
 
Join Date: Dec 1999
Posts: 102
hey thats Mercedes determination for ya... doesnt wanna qui on you.. I find nothin wrong with that.. hehe

btw.. it does sound like a vacuum leak..

take care
__________________
Turk..
00 S500 W220
93 300SE W140
01 C 240 W203
86 SVO Mustang (Turbo Pwr'd.. hehe)
Reply With Quote
  #5  
Old 11-11-2001, 07:19 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Included in the possible vacuum leaks are the shut-off diaphram itself. Start by pulling the brown vacuum line off the element (shut-off diaphram back of inj pump). Put a separate piece of line to the element start the engine and suck. If the diaphram is good the motor will die. If the diaphram is bad you will get a mouth full of black nasty diesel oil. Its easy to tell which condition exists (bg).

There are so many places that can drop the vacuum so you should start here.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #6  
Old 11-12-2001, 05:46 PM
Registered User
 
Join Date: Nov 2000
Location: St. Petersburg, FL
Posts: 200
I've been chasing down a vacuum leak in my 1982 300SD and have a couple of suggestions of a general nature.

1) Never underestimate the brittleness of nearly 20 year old rubber. I have taken to replacing ALL of the rubber junctions and a significant amount of the line itself. I've tested lines out and had them show a leak weeks later.

2) Start at the top. I had multiple leaks, in both climate control and the door locks. But, if you go up to the brake booster (I believe that's the right part), a golf tee can help figure it out. I pulled the line for the climate control off and plugged the line with a tee. The car stopped the next time I drove it (and every other time). It helped in tracking it down.

I still have a few more junctions (and a couple of door lock diaphragms) to replace, but at least the car shuts off for now...

- Ted
Reply With Quote
  #7  
Old 11-12-2001, 06:02 PM
Registered User
 
Join Date: Nov 2000
Location: St. Petersburg, FL
Posts: 200
I've been chasing down a vacuum leak in my 1982 300SD and have a couple of suggestions of a general nature.

1) Never underestimate the brittleness of nearly 20 year old rubber. I have taken to replacing ALL of the rubber junctions and a significant amount of the line itself. I've tested lines out and had them show a leak weeks later.

2) Start at the top. I had multiple leaks, in both climate control and the door locks. But, if you go up to the brake booster (I believe that's the right part), a golf tee can help figure it out. I pulled the line for the climate control off and plugged the line with a tee. The car stopped the next time I drove it (and every other time). It helped in tracking it down.

I still have a few more junctions (and a couple of door lock diaphragms) to replace, but at least the car shuts off for now...

- Ted
Reply With Quote
  #8  
Old 11-12-2001, 08:52 PM
LarryBible
Guest
 
Posts: n/a
Steve,

I've had an inordinately stressful day. Your explanation of determining the diaphragm condition was priceless. I can't remember the last time I laughed so hard.

For the umpteenth time, thanks for sharing your massive experience here and for throwing in the humor along the way.

Have a great day,
Reply With Quote
  #9  
Old 11-13-2001, 03:10 AM
TurboTurbine
Guest
 
Posts: n/a
Sounds like the vacuum line alright. try checking the rubber "fork in the road" connectors as those are the frist to go since they are exposed to the heat from the engine in most cases.
Reply With Quote
  #10  
Old 11-14-2001, 03:57 AM
Registered User
 
Join Date: Jun 1999
Location: Los Angeles, Calif, USA
Posts: 521
The 87 190D has 602 engine. I think the vacuum shutoff module is on top of the FI pump like my 603 engine. Remove the vacuum line to the module and look inside the line. If it is oily, the vacuum module is bad. I saw leaking module that still stopped the engine when vacuum applied. When the module is partially leaking and other part of the vacuum system is in good condition, the driver may not notice any problems.

The bottom line is: if the engine does not stop immediately (a sharp stop with no delay) after key is off, you have a problem. It may be a bad vacuum shutoff module, leaking hoses, bad vacuum pump, or the combination of all of the above. I would start checking for oil inside the vacuum line for the module. Replace the module if necessary. If the engine still does not shut off immediately, you have other vacuum related problem(s). Steve provided detailed steps to check vacuum leakage in the following link:

Vacuum Leakage


David

Last edited by be459; 11-14-2001 at 04:12 AM.
Reply With Quote
  #11  
Old 11-14-2001, 09:54 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Larry,

Real glad you appreciate it. You ought to see some of the humor I have erased. Its real hard sometimes. I never wish to offend and humor can be at others expense if one is not careful.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #12  
Old 11-14-2001, 09:19 PM
unkl300d's Avatar
Registered User
 
Join Date: Jul 1999
Location: San Francisco, Ca
Posts: 2,267
Steve , we need a BLOOPERS category!!


__________________
1979 300D 199 K miles
1995 C280 95 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Oil Additives Bill Wood Performance Paddock 6 08-24-2011 11:53 AM
Engine light comes when turning on ignition vikrantvir Tech Help 2 08-19-2003 12:04 PM
running a cold engine frosty Tech Help 3 10-25-2002 04:03 AM
Engine Run On arochard Tech Help 5 02-22-2002 10:33 PM
Engine doesn't run well when stepping on the throt diw67 Tech Help 1 10-16-2000 09:26 PM



All times are GMT -4. The time now is 09:49 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, 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