speedometer bounce
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Joined: Aug 2004
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speedometer bounce
Hello, I have a question. My 1995 f-150 speedometer bounces around. I have changed the sensor in the rear axle and the one in the automatic transmission. My cruise control works, but I cannot use it because the cruise is reading the speedometer and with it bouncing around it speeds up and slows down, very frustrating. Any suggestions greatly appreciated.
Posting Guru
Joined: Jan 2001
Posts: 2,358
Likes: 3
From: Nebraska
It sounds like the PSOM, or speedometer head, is going bad. It isn't an uncommon problem. Many times they'll also have a glitch giving the computer a false reading at about 1-2 mph killing the engine at that speed.
You'll need to pull the cluster and take each section out, and replace the center speedometer section. One from a junkyard would be the cheapest route, although your odometer won't be the same. Don't worry about finding one with the same transmission or a tach/no tach, they're all the same.
You'll need to pull the cluster and take each section out, and replace the center speedometer section. One from a junkyard would be the cheapest route, although your odometer won't be the same. Don't worry about finding one with the same transmission or a tach/no tach, they're all the same.
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Yup, a search for "bad PSOM" will find you the answer.
You can usually have a dealership program the mileage and tire size for you so it's correct. I ended up buying a new cluster from Ford and they programmed my mileage and tire size in it. Same thing happened to me brown4x4 talked about in my other F-150.
You can usually have a dealership program the mileage and tire size for you so it's correct. I ended up buying a new cluster from Ford and they programmed my mileage and tire size in it. Same thing happened to me brown4x4 talked about in my other F-150.
