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Car Forum / Mercedes-Benz Cars / November 2005

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1988 Mercedes 190E 2.3, engine dies intermittently when at idle.

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Bear69 - 14 Sep 2005 17:10 GMT
Just bought the car. Engine runs fine. Did tune-up the first thing.
Replaced plugs, wires, rotor and cap and fuel filter. Engines starts fine
but every once in a while, it just looses all power if I am at idle after
coming to a stop or while coasting with foot off of accelerator. Engines
cranks right back up and continues to run fine until the next time it
decides to just "die". It doesn't sputter or choke...it just plain quits
dead in it's tracks. Not sure if it's electrical or not since it always
starts right back up without hesitation.
Martin Joseph - 14 Sep 2005 19:53 GMT
> Just bought the car. Engine runs fine. Did tune-up the first thing.
> Replaced plugs, wires, rotor and cap and fuel filter. Engines starts fine
[quoted text clipped - 4 lines]
> dead in it's tracks. Not sure if it's electrical or not since it always
> starts right back up without hesitation.

That is going to be hard to troubleshoot, but it definitely sounds
electrical to me.  If it were fuel related one would expect some
sputtering.  Perhaps the coil circuit? Or the ignition switch circuit?

Marty
T.G. Lambach - 14 Sep 2005 19:57 GMT
I'd suspect the fuel pump relay - common item on other models but this
one is getting to "that age".
Tiger - 14 Sep 2005 19:58 GMT
Ditto on fuel pump relay.
Bear69 - 01 Nov 2005 19:44 GMT
I looked into the suggestion that it may be the fuel pump relay. When I
located what the maintenance manual said was the fuel pump relay it
appeared to be nothing more than two fuses in a plug-in type housing but
it had no cover on it like the photos depicted. Is this really what a fuel
pump relay should look like ? I am an old electronics technician and it
looks nothing like any type of relay that I have ever seen. No contacts,
no aperture, no springs, nothing...just two fuses in-between typical
spring tension retainers.
 
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