[W126 Coupe] Burning smell and rough idling

[Mister McGoo]

Hi;

You need to be a bit more specific on your "problems".

What year and engine?

Problem 1:  When you say it wouldn't start twice in one day, obviously it 
DID start.  What did you do to get it to start the first and second time?  
Anything, or did it suddenly "fix" itself?

Yes it could be a solder connection in the fuel pump relay (not the fuel 
pump)  The relay could be heating up also, (smell) but not likely for a 
month.

I gather that it has never happened again, yet.  If it does, you can test to 
determine if it is in the fuel system.

Problem 2:  It idles a bit rough now?  All the time, or just off and on?  
Have you changed the ignition wires, distributor cap and rotor in recent 
memory?  The possible fuel pump relay problem and the rough idle are not 
likely connected.

Problem 3:  As David says, the burning smell could very well be something 
leaking somewhere, like oil on the hot engine block.  Are there any visible 
oil leaks?  Power steering pump?  When idling, does the smell seem to be 
coming from the front or rear of the engine... one side over the other?  Any 
drops of oil or antifreeze underneath?

Of course, in New York City, the burning smell is likely from the street 
food vendors.

That, or from a taxicab cruising by on the sidewalk at 85 MPH with a 
pedestrian or two caught up in the undercarriage.

-Bellamy


>From: "Rattie S" <mbcoupe126 at hotmail.com>
>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>To: mbcoupes at mbcoupes.com
>Subject: [W126 Coupe] Burning smell and rough idling
>Date: Wed, 05 Oct 2005 18:49:16 +0000
>
>Hello,
>
>I posted a message about a month ago about some problems that I've been 
>having with my car. 2 months ago, I had the ignition module and coil 
>changed after the car died. It ran just fine for some time after that. 
>About a month ago, I had two instances on one day when the car wouldn't 
>start. It has been starting just fine after that. Some of you had suggested 
>that it could be a problem with a fuel pump soldier point.
>
>Recently, I'm noticing a burning smell when the car is running. The idling 
>has been a little rough as well. I had stopped to pick up some food from a 
>steert cart here in New York. I was a little suprised when the food vendor 
>came out of cart and told me to have my "relays" checked out.
>
>Any words of wisdom from the experts?
>
>Thanks and best regards,
>
>Itrat
>
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