[W126 Coupe] Summer starting?

[Richard Hogarth]

Thanks Iain, 
I'm going to try your suggestions.
-RH

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From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Iain Gunn
Sent: Sunday, August 28, 2005 7:13 AM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] Summer starting?


This sounds like a fuel issue. As I just went through this with my car, pull
the fuel relay and jump contacts 7 and 8. This will run the fuel pumps all
the time. Try to start the engine. If it is OK, its your fuel pump relay. If
not, check that BOTH fuel pumps are running. Do this with a piece of 1/2"
dowel or metal rod long enough to put one end on the pump and the other to
your ear. DO NOT force though your ear. LISTEN to the pumps. Next get a fuel
pressure check kit and check the fuel pressure. Should be 6.2 - 6.4 bar
running and stay at 3 bar for 30 minutes after shut off.

----- Original Message ----- 
From: Richard Hogarth <mailto:R_Hogarth at Foundrycove.com>  
To: 'Mercedes Coupes Mailing Lists' <mailto:mbcoupes at mbcoupes.com>  
Sent: Saturday, August 27, 2005 10:42 PM
Subject: RE: [W126 Coupe] Summer starting?

My 560sel has developed the same problem this summer and it doesn't seem to
be related to the AC. 
My problem started after replacing the fuel filter. I was thinking that
either the pumps were going out or that there is a vapor lock in the new
fuel filter. 
Any thoughts?
-R_hogarth at foundrycove.com

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From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Mike R.
Sent: Saturday, August 27, 2005 8:14 PM
To: 'Mercedes Coupes Mailing Lists'
Subject: [W126 Coupe] Summer starting?



The SEC has had a starting problem the last couple of weeks and it's been
getting a little worse each week. 

 

If it's cold, if fires RIGHT up. If it's been driven a while, up to normal
temperature, it seems to not like the next start - starts, stumbles, maybe
runs, no power and when it's put in gear it stumbles, quits, then may or may
not start. If the car is in a garage/parking structure, it has restarted
fairly easily. I rev it a couple of tims, then put it in gear and drive
away. Park the hot car in the hot sun, even under the car cover and 1. it
fires up but stumbles, quits, then won't start for a while or 2. it might
not start at all, just crank. Several times it fired right up but had no
power - putting it in gear and it stumbles and quits, then it's VERY
difficult to start. Today I tried to listen for the fuel pumps but no noise.


 

This didn't seem to happen until I fixed the A/C and now that the A/C is
cold, the car has this problem. Might be coincidence.

 

Vapor lock or fuel pumps? Which direction should I go in troubleshooting??

 

Later,

Mike R.

(702) 494-8056

 



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