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speedo problems please help

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Old Jul 18, 2007 | 07:29 PM
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speedo problems please help

Hi everyone my first post but have been a part of the site for a while but it my first post I no longer have the bronco II in my user name now I have a 95 f-150 regular cab short box with the 5.0 and 5 speed transmission.

My problem is that when I bought the truck the speedo didnt work and I found out that the wires that run to the speed sensor were corroted trough and the aires broke so I put a new connector on it and the ABS light went out and the spedometer works ok at slower speeds under 30 MPH but anything above the spedo jumps like crazy at 55 it will jump all the way to the peg and peg out and when it pegs out the engine cuts out for that split second and comes to life I thought that might be because the engine is governed and cuts out when the speedo hits the peg. I thought this might be because if you just unplug the speed sensor it never cuts out. Any help would be greatly appreceated
 
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Old Jul 18, 2007 | 09:27 PM
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From: Easton,Ks
Press and hold the RESET button on the front of the speedometer while turning the key to RUN.
Release the RESET button.
Does the pointer smoothly prove out, or sweep from 0 to maximum speed then back to 0?
 
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Old Jul 19, 2007 | 05:59 PM
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It goes to maximum speed then back to 0 and reads e 08 6 on the odometer
 
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Old Jul 19, 2007 | 06:15 PM
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From: Easton,Ks
Originally Posted by 87broncII17
It goes to maximum speed then back to 0 and reads e 08 6 on the odometer
Your Cluster should be OK then.
You should then check RABS/VSS SPEED SENSOR RING and SENSOR for:
Damaged, missing or bent teeth
Metal chips on speed sensor
Open or shorted sensor
Improper gap between sensor and speed sensor ring

Also check the wiring and the plugs from the sensor to the dash.
 
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Old Jul 23, 2007 | 07:17 PM
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dont I have to take off the diff cover to check the tone ring and how do Icheck the gap
 
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Old Jul 23, 2007 | 08:30 PM
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From: Easton,Ks
Originally Posted by 87broncII17
dont I have to take off the diff cover to check the tone ring and how do Icheck the gap
Yes I think you would have to.
Is your ABS light on also?
 
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Old Jul 23, 2007 | 09:34 PM
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No the ABS light isnt on
 
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Old Jul 24, 2007 | 07:06 AM
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From: Easton,Ks
Originally Posted by 87broncII17
No the ABS light isnt on
I would think that the VSS sensor is OK then.

You might try picking up a used cluster at a salvage yard and swap its PSOM for yours for a test to see if that fixes it.

You may also have a loose wire or plug under the dash.
 

Last edited by subford; Jul 24, 2007 at 07:08 AM.
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