[W126 Coupe] Starting Problem

[Mister McGoo]

Jim;
 
Did you get a chance to test the Fuel Pump Relay as described by Jonathan?  
 
A couple of other suggestions:
 
I gather that the problem only occurs after you have been driving a while and have stopped.  Then it won't restart.  If you are a bit uncertain about how to jump the contacts on the relay, or you are not sure where the relay is, there is another easy roadside test requiring no equipment.  When the engine won't restart remove the air cleaner and squirt some ether ("Quick-Start" or any starting fluid) straight into the intake horn and try again.  (You can carefully use a little dribble of gasoline... like 2 tablespoons if you don't have a can of ether)  IF the engine starts for a couple of seconds, the problem is definitely in the fuel delivery system.  The Fuel Pump Relay is usually the culprit. 
 
Another thought:  If the engine does NOT fire using the ether test, the problem is on the ignition side.  
 
If you leave the car sit with the engine hot and idling for and extended period of time (like 15 minutes) has the engine ever just suddenly died by itself and won't restart?  If you test everything you will find you have neither spark nor fuel. The problem is the rpm pickup on the flywheel which is connected directly to your ignition module.  When the pickup fails, the ignition shuts down and so does the fuel pump relay. (The good news is it is neither difficult nor expensive to replace)Do let everybody know what you find.
 
- Bellamy


Date: Sun, 22 Jul 2007 18:26:01 -0400From: jhodgman at gmail.comTo: mbcoupes at mbcoupes.comSubject: Re: [W126 Coupe] Starting Problem
Jim Coutsourelos wrote: 




Hi, 
 
I desperately need some help. I have a 380SEC 1984 model. When I start it in the morning or after a rest of more than 4 hours, it starts up fine, however, if I drive it for say 20 mins, switch it off, try and start it again its as if the motor gets no fuel and wont start. The starter is turning over but nothing. Then if I leave it there over night, it will start up fine the next day. I have taken it to 2 mechanics that can’t seem to find a problem as it will start for them after playing around with it for a while.
 
Any suggestions??
 
Thanks
 
Jim (Melbourne Australia)
 
 
 
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Postings remain property of MB Coupes, L.L.C.Sounds like your fuel pump relay is having fits..  Next time jumper pins 7&8 on your FPR see if she'll start.Jonathan-- 
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