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Old 12-04-2001, 07:48 AM
Registered User
Join Date: Nov 2001
Posts: 12
Crouse control "pumping"

Hi all...

I have an MB 560SEC-88 and the Crouse control is "pumping" when i go downhill.... any ideas how to fix it????
-88 560SEC
-77 280SE
-71 Mercury Cougar Convertible
-84 GMC Pickup
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Old 12-04-2001, 09:30 AM
blackmercedes's Avatar
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Thanks to all the cruise control problems with MB's of all models for many years, your local dealer has a specialized diagnostic tool for finding cruise problems.

Most dealers either charge little or nothing for this service, and it's quick and simple.

Call your dealer...
John Shellenberg
1998 C230 "Black Betty" 240K

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Old 12-04-2001, 09:32 AM
Registered User
Join Date: Jun 2000
Location: Tucson, Arizona, USA
Posts: 180
Most likely the cc amplifier is bad. Try lubricating the throttle linkage first.


560 SEL '90 Cruise Control surges constantly

Cheers, Andrew Seidel.
86 560SEC
85 500SEC Lorinser
83 300D Turbo
75 240D
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Old 12-04-2001, 09:38 AM
Gilly's Avatar
Registered User
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616

The cruise tester has been around as long as the cruise system. It just tests the power and ground, all the switch contacts, the brake pedal switch, the speed sensor, and allows the motor to be run. If everything works on the car, it's the amplifier.
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