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Old 12-11-2012, 02:23 PM   #1
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Default Speedometer is tweaking out

Ok so this morning I looked at my speedometer and the needle was constantly bouncing around and the truck was shifting weird as if it was bouncing back and forth from gear to gear. I was thinking it might be a fuse. Any ideas anyone?
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Old 12-11-2012, 02:40 PM   #2
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VSS sensor.... check the connector and wiring
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Old 12-11-2012, 02:45 PM   #3
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Where is it located? And what does it look like? And honestly, what is it?
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Old 12-11-2012, 02:52 PM   #4
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Vehicle Speed Sensor....

Google has tons of info on it
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Old 12-11-2012, 02:54 PM   #5
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Would that have caused the transmission to shift funny?
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Old 12-11-2012, 04:08 PM   #6
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the VSS
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Old 12-28-2012, 03:42 AM   #7
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I just bought a 94 F150 XLT...has 118,000 miles on it. So far a great truck for its age/miles. But I am also having the speedo issues that the OP is having. Does fine until about 35-40 mph, then the needle goes all crazy after that. Also noticed the Overdrive acts a bit funny, as well. Could this also be the VSS? Thought maybe the cable was just slipping. Just looking for a place to start...
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Old 12-28-2012, 04:15 AM   #8
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yes the VSS could cause that also.
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Old 12-28-2012, 11:54 AM   #9
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Quote:
Originally Posted by RoadKingRocket
I just bought a 94 F150 XLT...has 118,000 miles on it. So far a great truck for its age/miles. But I am also having the speedo issues that the OP is having. Does fine until about 35-40 mph, then the needle goes all crazy after that. Also noticed the Overdrive acts a bit funny, as well. Could this also be the VSS? Thought maybe the cable was just slipping. Just looking for a place to start...
Start on the back axel there's a sensor on top of the middle of the back axel. Follow thoes two wires that's sounds the same as mine
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Old 12-29-2012, 03:49 AM   #10
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Bought a new ABS Speed Sensor today ($17). Installed it and it corrected my problems with the speedometer...mostly. The needle is definitely more stable...but still wants to bounce a little at higher speeds (50+ mph). Overdrive shifting is definitely better. The fluctuations in the needle is around 5 mph or less (for example: dances between 45mph to 50mph when I am doing approx. 50mph). Much better than a 15-20+ mph spread. I did notice when I removed the old sensor that there was some black sludge-like residue on the portion of the sensor that was housed within the housing. Could this residue cause bad readings by the sensor? I just bought the truck, so there is no telling when (or if) the case oil has changed. I am sure it could use a good fluid change.
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Old 12-29-2012, 03:49 AM
 
 
 
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