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 11-24-2014, 10:30 AM
Registered User
 
Join Date: Dec 2008
Location: columbia, sc
Posts: 99
93 300d glow plug issue

Lately my glow plugs haven't been working right. The light doesn't come on when I turn the key on but after the car cranks up the light comes on and stays on for a little while. It doesn't seem like the glow plugs are coming on during initial starting because it starts slow if he doesn't try to start it all on cold mornings. Any ideas what might be causing that issue
__________________


93 300d-turbo
85 300d(svo)320k
83 300d 440k
84 300d(roommates)260k
83 300td(svo)250k
87 isuzu pup(diesel)svo 320k
96 nissan 240sx(turbo)
08 suzuki m50
95 e350 prowerstroke boxtruck
Reply With Quote
  #2  
Old 11-24-2014, 10:45 AM
jay_bob's Avatar
Control Freak
 
Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,272
Your relay self-test feature is telling you that one or more glow plugs have failed.

You can do a quick check with a meter at the glow plug relay. Black box on the forward edge of the left front wheel well. Be careful under the cover, the big screw head and strip fuse have direct battery voltage on them so watch out you don't short that out.

There is a 4-pin (control) and 6-pin (to glow plug) harness. Unplug the 6-pin plug and check resistance of each glow plug to the car body. Meter pin 1 to frame, pin 2 to frame, etc. You have a 5 cylinder engine so pin 6 is empty.

If you have one or more plugs where the resistance is > 1 ohm then there's your problem.

Glow plug change on an OM602 is not too difficult. I would go ahead and change all 5 while you are in there.

The intake manifold has to come off unless you are a contortionist. So be sure to also order the intake manifold gasket, and cross over pipe gaskets as well (o-ring on one end, flat gasket on the other).
__________________
2014 ML350 Bluetec (wife's DD)
2008 E320 Bluetec (my DD)
2008 ML320 CDI (Older son's college DD)
1998 E300DT (Younger son's college DD)
1987 300TD sold to vstech
----------
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
Reply With Quote
  #3  
Old 11-24-2014, 11:03 AM
Registered User
 
Join Date: Dec 2008
Location: columbia, sc
Posts: 99
Thanks for the fast response! I'll get to checking!
__________________


93 300d-turbo
85 300d(svo)320k
83 300d 440k
84 300d(roommates)260k
83 300td(svo)250k
87 isuzu pup(diesel)svo 320k
96 nissan 240sx(turbo)
08 suzuki m50
95 e350 prowerstroke boxtruck
Reply With Quote
  #4  
Old 11-24-2014, 03:27 PM
TnBob's Avatar
Registered User
 
Join Date: Dec 2009
Location: Shelbyville, Tn
Posts: 1,907
>1 and <50.

Not only can they short, they can also open.
__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."
Reply With Quote
  #5  
Old 11-24-2014, 06:41 PM
Registered User
 
Join Date: Sep 2007
Location: Calgary Alberta Canada
Posts: 1,194
I believe the behaviour of your light indicates at least 1 GP that is shorted and no power is going to the GPs. You should also try to find a GP that has 0 ohms which would be the short. Also check for .7 or greater ohms but anything above 2 ohms should also be considered no good. If its the first time you will be doing this allow some time and also clean out the intake since it will all be off anyways.
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 06:38 PM.


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