CRUISE CONTROL INTERMITTENT
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Cross-Country
Joined: Oct 2014
Posts: 78
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CRUISE CONTROL INTERMITTENT
Have a 1993 F150 XLT, 5.0, E4OD with an intermittent cruise control; mostly non-functioning. At the suggestion of a local mechanic I changed the pressure switch near lower frame, disassembled and cleaned cruise control switches on steering wheel, replaced the multi switch for unrelated issue, new brake master. Seems like every time I try to fix issue the CC will work for a very short time then not. When non-operation a buzzing or humming noise can be heard when the set button is pushed. All lights are working and there are no codes. Thoughts and/or suggestions?
Lead Driver
Joined: Jul 2017
Posts: 9,602
Likes: 1,174
From: San Jose, CA
The only time I ever had a CC problem was with an '89 Cadillac. On a hunch I replaced the vacuum actuator/pot and that was it!
I think I tried testing it, by hand manipulating the diaphragm and blocking off the vacuum ports to see if it would release or hold, but I don't remember that being too successful which is why I took a leap of faith.
I don't want to spend any more of your money on a witch hunt, but the diaphragm is the only thing I can think of that would be as prone to failure, or even more so than some of the electric components.
Good luck!
Paul
I think I tried testing it, by hand manipulating the diaphragm and blocking off the vacuum ports to see if it would release or hold, but I don't remember that being too successful which is why I took a leap of faith.
I don't want to spend any more of your money on a witch hunt, but the diaphragm is the only thing I can think of that would be as prone to failure, or even more so than some of the electric components.
Good luck!
Paul
Cargo Master
Joined: Mar 2003
Posts: 2,333
Likes: 296
93 up has an electric speed control servo that often causes sporadic operation as you describe, but I personally have never heard any associated buzzing sound.
Don't think there is a way to test it other than to swap a known good unit to see if correct operation resumes.
My 93 is on it's 3rd servo, my 95 is on it's 2nd and my 97 has the "known good" unit that I use to test with.
Don't think there is a way to test it other than to swap a known good unit to see if correct operation resumes.
My 93 is on it's 3rd servo, my 95 is on it's 2nd and my 97 has the "known good" unit that I use to test with.
Mountain Pass
Joined: Sep 2009
Posts: 238
Likes: 14
Many years ago I had a similar problem...turned out to be nothing more than the brake light switch out of adjustment...kicking off the cruise (and turning on brake lights) now and again. That was back when everything was much simpler.
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Mark76f250
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 14, 2004 03:33 PM
