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Cruise Control problems 850

posted by  someone claiming to be bill on  Mon Jul 15 16:47 CST 2002 [RELATED]

Control module problem is VERY unlikely. More likely are split hose from vacuum pump to actuator, brake vacuum valve out of adjustment or leaking, leaking servo diaphram at accelerator pedal, or a corroded vacuum pump. The vac pump mounts under the battery tray. The hose problem usually found behind/under the battery tray. Try lifting up on the brake pedal with your foot and see if it works. This would indicate misadjusted brake pedal vacuum valve. To test the integrity of the vacuum system, find the black hose at the vacuum pump on the front side bottom of the battery tray. Apply vacuum to the hose with a cheap vacuum pump from a local discount auto parts store. As you pump vacuum, the throttle spool should begin to rotate. (engine off during test) Stop pumping and the throttle should hold it's position. If it slowly returns to idle position, you have a leak.






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