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 01-16-2017, 01:48 AM
Registered User
 
Join Date: Jan 2003
Posts: 259
1991 560SEL stalls and would not start then starts right up after a few days

My car stalled while waiting for a green light. I had to have it towed. While waiting for the tow truck for about 2 hours I tried to start it sevetal times but would not start. It cranks normally but no start. Car was towed to my house. After a few days when I had the chance to work on it I thought I would try and start it before doing anything further. Well, it started right up.

How do you go about troubleshooting in a situation like this.

Suggestions are appreciated. Thank you.

Reply With Quote
  #2  
Old 01-16-2017, 07:49 AM
Hirnbeiss's Avatar
ich fahre, also bin ich
 
Join Date: Mar 2002
Location: South Florida
Posts: 1,664
I have no experience with your model, but the symptoms are classic "bad crankshaft position sensor". It tends to fail when warm, engine cranks and cranks but won't start, and it works again after cool down.
It's a straightforward swap out BUT the sensor can be stuck in the bellhousing after so many years, so be prepared or let the shop do it.
__________________
Prost!
Reply With Quote
  #3  
Old 01-16-2017, 08:18 AM
Registered User
 
Join Date: May 2009
Posts: 301
Quote:
Originally Posted by Hirnbeiss View Post
I have no experience with your model, but the symptoms are classic "bad crankshaft position sensor". It tends to fail when warm, engine cranks and cranks but won't start, and it works again after cool down.
It's a straightforward swap out BUT the sensor can be stuck in the bellhousing after so many years, so be prepared or let the shop do it.
Also a symptom of the distributor rotor arm going o/c or high resistance when hot. A cheap easy fix if that's the case.

RayH
Reply With Quote
  #4  
Old 01-16-2017, 08:34 AM
Registered User
 
Join Date: Jun 2002
Location: Conway, SC
Posts: 296
The most common problem would be the fuel pump relay.
__________________
Mercedes Benz Master Tech
Reply With Quote
  #5  
Old 01-16-2017, 02:44 PM
Registered User
 
Join Date: Jan 2003
Posts: 259
Quote:
Originally Posted by Hirnbeiss View Post
I have no experience with your model, but the symptoms are classic "bad crankshaft position sensor". It tends to fail when warm, engine cranks and cranks but won't start, and it works again after cool down.
It's a straightforward swap out BUT the sensor can be stuck in the bellhousing after so many years, so be prepared or let the shop do it.
any suggestion on where to get this sensor? I looked on ebay and looks like this is an expensive part
Reply With Quote
  #6  
Old 01-16-2017, 04:25 PM
Registered User
 
Join Date: Aug 2015
Posts: 46
Quote:
Originally Posted by emmydotnet View Post
any suggestion on where to get this sensor? I looked on ebay and looks like this is an expensive part
If the crankshaft position sensor fails you still be able to hear the fuel pump prime when you cycle the key in the ignition but it will not run when you crank the engine with the starter and there will be no spark from the ignition coil when cranking.
If the fuel pump relay fails you will not be able to hear the fuel pump prime when you cycle the key in the ignition and you will have spark from the ignition coil when cranking the engine.
The key to isolating the fault is in determining if the engine fails to start due to lack of fuel or lack of spark. This is easily accomplished by carefully spraying a dose of brake cleaner in the airflow sensor plate with the air filter housing removed. If the engine pops off like its trying to start, then youre not getting any or enough fuel to start the engine, hence "fuel delivery problem", such as, possible fuel pump relay faulty.
If the engine doesnt even try to pop off or start after you spray it then you check for spark. The easiest place to check this is at the coil wire in the center of the distributor cap. Twist the connector and then pull up on it to remove it, stick a spark plug in the wire and lay it on the top of the engine, have someone get in the car and crank it over while you watch for ignition sparks at the spark plug. If there is no spark then you have an ignition issue such as crankshaft position sensor faulty or ignition coil faulty. There are easy ways to determine which is at fault.
Note: If you are going to try to diagnose the car, be very careful when handling fuel and ignition components as they can hurt you, badly, and there are many precautionary measures which should be followed.

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 02:06 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