Cruise Control Problems
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Joined: Sep 2004
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Cruise Control Problems
The cruise control on my '90 E350 7.3L works, but instead of holding a constant speed it accelerates and coasts over a 10 mph range (approx.). It used to work fine, although it did the same thing occasionly during periods of high humidity. I've replaced the speed sensor, control module, and actuator (twice), with no change. There is plenty of vacume (19.5" hg). Any ideas? Thanks.
Joe
Joe
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Joined: Sep 2004
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The lines look to be in good shape and the vacume pump pulls 19.5" hg measured at the hose that connects to the actuator. The reservoir was rusted out when I bought the van and replacing the reservoir fixed the cruise control then. The local Ford dealer service department says the problem is usually with the actuator. I've tried three used actuators, maybe they were all bad. A new one is over $150, so I don't want to buy a new one unless I know that is the problem. I checked everything per Ford manual and all is within specs. There is no test for the function of the position feedback sensor in the actuator.
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
Try napa or a parts store. If they tell you it's a dealer only part, buy a $100 aftermarket kit and steal the actuator from it. It should work as it's vaccum controlled as well. The actuator is a diaphram that moves under vaccum, then there is a valve controlled by the cruise computer that allows the vaccum to "energize" the actuator.
