HELP: Speedo problems
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Joined: Aug 2007
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HELP: Speedo problems
I have a 94 F150 with a 351 and an Auto, 2WD, I think it’s the heavy duty E4OD. Some times the speedometer stops working for a split second, and bounces back and forth, no rime or reason that I can find, also if it cuts out for more then a second or two the tranny will go out of over drive and into third. ffice
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Has anyone seen this issue before? I tried to find the sensor on the tranny for the speedometer and could not find it, I cleaned the main connector on the tranny and this did not help. It’s annoying as hell. I can’t find any info in any of my books on the speedometer and what the circuit is, any help would be greatly appreciated.<O></O>
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> </O>Has anyone seen this issue before? I tried to find the sensor on the tranny for the speedometer and could not find it, I cleaned the main connector on the tranny and this did not help. It’s annoying as hell. I can’t find any info in any of my books on the speedometer and what the circuit is, any help would be greatly appreciated.<O
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Junior User
Joined: Aug 2006
Posts: 53
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i had i problem like this.. mine would shift in and out of over drive and speedo jumped back and forth. it was the throttle position sensor that fixed the shifting problem still havent found out why the speedo jumps back and fourth....
Junior User
Joined: Oct 2005
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I too have a 94 F150 351, e40d. the input for the speedo does not come from the transmission, it comes from a sensor on top of the rear axle, right on top of the pumpkin.
There is an exciter gear in with the ring and pinion that triggers this sensor and then the signal travels up to your PSOM (programmable something or other) in your dash cluster and goes through a conversion factor to display the correct speed. You can change the conversion factor up to 6 times for reasons like different tire sizes etc.
try holding down your odom reset (or select button I can't remember which) button and then turning on your key to the run position (DO not start). Your speedo will do a full sweep and then some info will be displayed in the odometer window. like E for Engligh and 6 for the number of times you can still change the conversion factor. pushing the reset or the selct button again gives you the actual conversion number.
I too have had a speedo anomoly, but it is more of a 5 mph wandereing around 80-85 and I have just been living with it.
hope this helps.
Regards,
Delray
94 F150 Supercab Flareside 351, e40d, 3.73's, Cervini Ram Air Hood, Vortech S-trim, lowered 2/4, et 14.90
There is an exciter gear in with the ring and pinion that triggers this sensor and then the signal travels up to your PSOM (programmable something or other) in your dash cluster and goes through a conversion factor to display the correct speed. You can change the conversion factor up to 6 times for reasons like different tire sizes etc.
try holding down your odom reset (or select button I can't remember which) button and then turning on your key to the run position (DO not start). Your speedo will do a full sweep and then some info will be displayed in the odometer window. like E for Engligh and 6 for the number of times you can still change the conversion factor. pushing the reset or the selct button again gives you the actual conversion number.
I too have had a speedo anomoly, but it is more of a 5 mph wandereing around 80-85 and I have just been living with it.
hope this helps.
Regards,
Delray
94 F150 Supercab Flareside 351, e40d, 3.73's, Cervini Ram Air Hood, Vortech S-trim, lowered 2/4, et 14.90
