Merc Idling Cut Out

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Sun 3 Jun 2001 10:19
Merc Idling Cut Out - TT
I have a very high mileage 1995 Mercedes C class with an irritating cutting out problem.

It's absolutely fine when cold but when it has warmed up it is unhappy idling and wavers around the idle point usually ending up with a stall.
This is making stop start commuting a total pain as it just cuts out in traffic all the time.

The car is maintained regularly - but not by a Merc garage- and recently had a service but as the problem only happens when warm they spent forever looking for it unsuccessfully (very annoying).

I have fair mechanical knowledge but am a bit inhibited as this is my first fuel injected car.
Does anyone have any ideas?
At least then I can be forewarned should I bite the bullet and go to a merc garage or specialist.

cheers

tt
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Mon 4 Jun 2001 09:12
Re: Merc Idling Cut Out - Cliff Pope
I don't know abour Mercs specifically, but most fuel injected cars have an electrically operated idle control valve. This is usually an alloy coloured pot about the size of a Brasso tin somewhere under the inlet manifold. It controls the bypas of air from the intake duct into the inlet manifold, and I find gradually soots up with road dirt, leading to sticky operation and erratic idling. Worth taking it off, cleaning in petrol, and refitting, before you spend any money having anything else checked.
Might not be quite like that on your car, but worth a check.
Cliff pope
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Sun 30 Sep 2001 17:37
Re: Merc Idling Cut Out - Paul Teale
Hi TT

Don't know if you still have this prob but my 1989 230te has recently started to do the same but not quite cut out, i changed the distributer cap and roter arm but still the same, then changed the plugs for Bosch super 4's and now its seems to idle lovely, if that still does'nt work its possible your ignition leads need replacing as they start to break up with high milage and allways seem to play up after a good run when stationary.

Good Luck

Paul
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