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 01-25-2022, 10:46 AM
Registered User
 
Join Date: Feb 2020
Location: Sunny Phoenix
Posts: 2
1989 W124, M103 won't start

PO replaced one fuel pump, drove it home, never got it started again. Spark looked weak, replaced cap, rotor, wires, plugs, still no start. Replaced coil, fired up instantly. Ran 4 minutes, shut off and would not restart... a few punky vacuum lines here and there, over 140psi fuel pressure if regulator is disconnected (the only way I can install my gauge). Measured 12v at fuel pump during prime, about 9 while cranking (old battery). It's run a total of a half an hour, but something is still very intermittent. CPS measured about 650 ohms. No blown fuses, reflowed all solder connections in FPR, OVP Relay, and some accessory relay behind the fuel pump relay. Car has about 200k on it, in very good shape thanks to Arizona's lack of the need for road salt...

Reply With Quote
  #2  
Old 01-25-2022, 12:03 PM
ILUVMILS's Avatar
Senior Member
 
Join Date: Sep 2002
Posts: 3,066
Quote:
Originally Posted by Rayos-x View Post
PO replaced one fuel pump, drove it home, never got it started again. Spark looked weak, replaced cap, rotor, wires, plugs, still no start....
Was the coil wire replaced?
Reply With Quote
  #3  
Old 01-25-2022, 12:51 PM
Registered User
 
Join Date: Feb 2020
Location: Sunny Phoenix
Posts: 2
yep

the entire HT portion of the ignition was replaced... unknown age and condition, so I just shotgunned it.
Reply With Quote
  #4  
Old 01-25-2022, 03:04 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 4,075
Quote:
Originally Posted by ILUVMILS View Post
Was the coil wire replaced?
Quote:
Originally Posted by Rayos-x View Post
the entire HT portion of the ignition was replaced... unknown age and condition, so I just shotgunned it.
And yet, the question remains: Is there spark at the plugs?
Reply With Quote
  #5  
Old 01-31-2022, 06:43 AM
optimusprime's Avatar
Trevor Hadlington
 
Join Date: May 2014
Location: Worcestershire in England
Posts: 1,453
CPS 650 ohms reading is to low it must be 800 ohms to 1100 ohms

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 07:32 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page