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  #1  
Old 03-28-2007, 09:14 PM
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speedometer

i recently bought a 96 250. it has 320,000km. (canadian). as i was driving home i realized that evry time i touched the brakes, pulled out the light switch, let off the gas my speedo would jump like crazy from current speed to zero. at low speeds it works fine. any ideas. truck s five speed thanks
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Old 03-30-2007, 12:10 AM
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i would say your variable speed sencor is on its way out.located on the top of the rear-end.that is what controls the speedo
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Old 03-30-2007, 05:21 AM
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i know this may sound dumb..but i had an 88 f-150 and the speedo would randomly jump all the time. but never truely worked..we replaced the transfer case, and it worked everyday from then on out. a bit of work for a speedo, but i suppose every bit of info helps
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Old 03-30-2007, 07:03 PM
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talked to the previous owner and he said he recently replaced that sensor. his mechanic suggested something about a command start could of been installed then taken out and some wires mucked with. is the speedo just have a cable or is it run electronically? or am i crazy
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Old 03-30-2007, 10:21 PM
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pull the sensor out and clean in and put it back in and try it.sometimes there
is dirt or metal on it from the ring and pinion gear.


not sure about the 88 f150
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Old 04-02-2007, 10:30 PM
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i removed sensor and cleaned it there was a bit of crap on it. put it back in and same stuff still happened. i even removed the whole gauge pod and nothing was messed up any other sugestions?
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Old 04-05-2007, 07:05 AM
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problem solved i pulled sensor out cleaned it and realized it was not pushed all the way in.
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Old 04-08-2007, 04:01 PM
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That will do it lol, glad you got it fixed man!!
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Old 04-03-2008, 07:22 PM
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and go figure 3000km later my speedo is acting up again. for awhile it totally stopped working so i bought a new rear speed sensor and still nothing. i was driving and started pushing my cruise control buttons and it slowly started to work for a couple of hours then started the erratic bouncing. Is there anything else on that circuit i can try replacing? and just for info my ABS light is on too

Last edited by materi; 04-04-2008 at 06:32 AM.
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Old 04-06-2008, 02:23 AM
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my does the same thing and I replaced the speed senser three time , dumped the rear end checke the ring gear its all okay, I have been told it is the speedo it self the electonics are buggerd up so new guage cluster is the only fix for me I can live with it though hpoe thats helps
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