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Old 11-02-2005, 10:52 PM
Chas.O.Hall's Avatar
Mercedes-Benz 560 SEL
Join Date: Nov 2005
Location: Canada
Posts: 2
Red face 89 560 SEL Sticking Cruise Control !

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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Old 11-03-2005, 05:43 AM
blueeagle289's Avatar
Blue Eagle
Join Date: Nov 2003
Location: Dallas, TX
Posts: 457
Wink 89 420sel

The big round thing on the floor is a kickdown switch that drops the tranny down a gear for acceleration purposes when you really want to increase speed in a traffic situation, going into an on ramp, etc. etc. If it is loose, it could be actuated wrongly.

The cruise should go off by pushing the cruise handle back or putting on the brakes, either one. Something is wrong with the circuits or the cruise actuating system out on the engine to allow continuous cruise after you try to turn it off by braking. Check it all out ....
Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)
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Old 11-04-2005, 12:07 AM
Chas.O.Hall's Avatar
Mercedes-Benz 560 SEL
Join Date: Nov 2005
Location: Canada
Posts: 2
Talking 560 SEL Sticking Throttle Update

Thanks your efforts appreciated - suspected switch beneath gas pedal not secured to floor (OK now).
Yes cruise control was sticking, appears
OK after cleaning and heavy lubing.

regards Chas

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