Sticking 89 560 SEL Cruise Control.

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Chas O. Hall - 03 Nov 2005 04:29 GMT

Thanks for taking the time to read this.
I have a 89 560 SEL with a sticking cruise control.
Twice this baby has had me a little stressed having to pull over and
turn the engine off after using the cruise control. Both times there
seems to be a lag in the gas pedal before using the cruise control to
accelerate. e.g. You press down on the gas pedal and nothing happens,
you keep pressing down about 50% to the floor, then Bam, it takes of
like a rocket. Now you get to the speed you want to be at real
fast..cause it's a 560SEL (;=
Next you put the cruise control on by just hitting the accel lever.
Everthing is good here.
Now I just want to accel a few miles an hour to get just to the legal
limit. Press the accel lever again and this heard of horses is off like
a runaway stampede... Wow there.... hit the brakes...
Nothing happens, I slow down but as soon as I take my foot of the brakes
this 560 is off and running again. I thank Mercedes for Damn good brakes
and my strong right leg to bring this heard to a halt.
I have given the linkages under the airfilter and the linkage to the
cruise control box a spray with lube but am sorta not looking forward to
using the Cruise anymore. Any-one heard/had this happen.
p.s. one more question.
What is the big round switch on the floor under the gas pedal for ?
It was lose and flopping around down there. Now safe back in it's
holder.

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Karl - 03 Nov 2005 05:28 GMT

The button under the pedal is trans kickdown.

Does your 89 560SEL have ASR?

> Thanks for taking the time to read this.
> I have a 89 560 SEL with a sticking cruise control.
[quoted text clipped - 20 lines]
> It was lose and flopping around down there. Now safe back in it's
> holder.

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Chas O. Hall - 03 Nov 2005 08:07 GMT

Hi Karl, Thanks for the info on KickDown Switch. That's what I thought
it may be.
Not sure about the ASR... What does that mean ?

> The button under the pedal is trans kickdown.
>
[quoted text clipped - 25 lines]
> > It was lose and flopping around down there. Now safe back in it's
> > holder.

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Karl - 03 Nov 2005 15:38 GMT

Acceleration Slip Control.

Do you just have linkage on top of the engine for throttle actuation?

Or do you have an electric motor? [NOT counting the silver box shaped cruise motor]

> Hi Karl, Thanks for the info on KickDown Switch. That's what I thought
> it may be.
[quoted text clipped - 29 lines]
> > > It was lose and flopping around down there. Now safe back in it's
> > > holder.

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saeef - 05 Nov 2005 04:23 GMT

> Acceleration Slip Control.
>
> Do you just have linkage on top of the engine for throttle actuation?
>
> Or do you have an electric motor? [NOT counting the silver box shaped cruise motor]

I had similar problem once in my 91 560SEC with ASR. The accelerator
pedal was so hard that I could not keep pushing it for long to drive
the car. I had to disconnect the linkage to the cruise control motor to
drive the car.
I opened the electric motor and cleaned it, put it back and it worked
fine again, no problem since then.
This problem happened after I sprayed my engine bay with water to
clean. I suspect some moisture got inside the electric motor.

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