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Originally Posted by amplifier28
Is there a way to clean the cruise control servo?
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I had to do this to my '91. Cruise had the trademark problem of running for 10 min and then dropping slowly out of cruise.
I removed the servo and disassembled the solenoid valve section. The problem seemed to be that one of the valves would stick. I thoroughly cleaned the solenoids and lubricated them, as well as applying a tiny bit of seal conditioner (like transmission fix-leak stuff) to the various rubber seals/o-rings. I also put a hose clamp on the aforementioned brake-release hose since it seemed a little bit loose.
That was about 80,000 miles ago, so I don't quite remember which solenoid it was (there are two). I do remember having to very thoroughly clean and lubricate it. I also tested it by applying voltage (just use a 9v battery if you have the servo out of the car) to the solenoids.
The problematic solenoid's armature seemed to be the wrong size - I remember thinking that if I were able to shorten or lengthen it (don't remember which -- but to realign the armature with the coil), it would generate more force and work better.
I think I remember there being a TSB on the problem that I had; if I recall correctly the TSB said to just replace the servo.
The cruise has been working fine since...
- GB