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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Speedometer bouncing

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Old Apr 24, 2012 | 03:11 PM
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ab257z
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Speedometer bouncing

My wife was driving home yesterday in the rain, and the speedometer started bouncing between her speed (65) and 80. Anyone know where the speed sensor is so I can check the wiring connection? Anything else it might be? Would that affect the performance of the engine in any way?
 
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Old Apr 24, 2012 | 03:26 PM
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Originally Posted by ab257z
My wife was driving home yesterday in the rain, and the speedometer started bouncing between her speed (65) and 80. Anyone know where the speed sensor is so I can check the wiring connection? Anything else it might be? Would that affect the performance of the engine in any way?
VSS, ontop of rear differential
 
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Old Sep 17, 2012 | 09:09 AM
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ab257z
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Turned out that the speedometer bounced when the wipers were on, not just when it was raining. A pinched wire from the wiper motor under the cowling had finally separated.
 
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