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Home >> Ford >> 1998 >> Windstar Base, 3.8 4 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> System Testing >> Test E: Set Speed Fluctuates
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Test E: Set Speed Fluctuates

  1. Check If Condition Occurs Only While Using Cruise Control  - Ensure engine is properly tuned. Ensure problem does not occur while driving vehicle without speed control activated. If problem occurs without speed control activated, repair engine as necessary. If problem occurs only with speed control activated, go to next step.
  2. Check For Binding In Speed Control Cable & Throttle Body Linkage  - Check for binding or sticking speed control servo/actuator cable, throttle linkage and/or throttle plate. Ensure throttle cable bracket and speed control servo/actuator bracket are not loose. Repair as necessary. Repeat SELF-DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. Test drive vehicle to check operation. If all components are okay, go to next step.
  3. Check For Broken Or Binding Speed Control Cable  - Remove speed control servo/actuator cable from speed control servo/actuator. Check for broken or binding cable by pulling on cable ball slug to ensure throttle moves freely. If speed control servo/actuator cable is okay, replace speed control servo/actuator. Repeat SELF-DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. Test drive vehicle to check operation. If speed control servo/actuator cable is not okay, replace speed control servo/actuator cable. Repeat SELF-DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. Test drive vehicle to check operation.
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