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Speed control disengages prematurely. What is the cause

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Depending on the technology that the speed control uses, the circuit is not firmly secured which is what some might call a "short" in the system. Bear in mind (mind you) that the "circuit" could be a system of vacuum pressure or could be a predefined pathway of electric current. This break in the circuit is mild enough to possibly yield to vibration (such as when a wire or grounding strap is not fastened), to pressure (such as when a seal does not hold-possibly due to the throttle cable's rubber diaphragm stiffing or cracking from age). More than likely (in an electronic (servo-controlled) speed/cruise control system, the system probably has a faulty servo.

Posted on Nov 29, 2014

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