[R129 SL] 1991 500SL stumbles after warm up

[Baktash Taghehchian]

i had the same problem... i did all the same things as
you did, and then changed the fuel filter and the plug
wires... i'm not sure which one fixed the problem out
of the 2, but the problem was resolved. the only thing
is those darned plug wires arent cheep for the 500sl.

good luck,
Baktash


--- Cliff Sadler <sadler@comcast.net> wrote:
> 
> All,
> need your experience/expertise on this one.
> 
> I've researched all I can on this in the archives.
> 
> My car consistently does the following:
> When starting cold, it feels like it's not running
> on all cylinders. Then
> after a second, the idle rpms come up, and the car
> runs fine.  After a few
> minutes, the car will begin to stumble again.  This
> has been intermittent
> for months. Now it is guaranteed to stumble
> intermittently for a bit, and
> then go to a clear performance loss, and vibration,
> like a cylinder has
> dropped out of the mix. This remains until the car
> has sat for hours.
> 
> In an effort to remedy this, I have replaced the
> spark plugs (7 were clean
> dry, and somewhat grey ash, 1 had some carbon, but
> not loaded up, or
> fouled), distributor caps, and rotors. The car ran
> GREAT for about 48 hours,
> then back to the same old thing. (sat for 3 days
> waiting for parts)
> 
> I checked all plug wires (didn't remove them though)
> to make sure the cap
> ends were screwed on tight on both ends.
> 
> Now I'm starting to think that maybe the car has
> sludge in the gas tank, and
> doesn't get starved until it's been moved for a bit,
> and it's not really
> temp related.
> 
> Today, I'm going to start the car, and let it idle
> for a half an hour or so,
> to see if it starts to stumble.
> 
> any other bright ideas?
> 
> TIA
> Cliff
> 
> 
> The MB Coupes Website!
> R129 SL Mailing List


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