Speedometer not accurate
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Senior User
Joined: Jul 2010
Posts: 170
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From: Western SD
Speedometer not accurate
Driving today, my truck seemed to be surging a little on cruise control (it was/is quite windy today 40 MPH +so that may be part of the surging). I also noticed that the speedometer is accurate up to 40 MPH. Above that it runs faster than I am going according to GPS. At 45 it is 1 mph high. At 65 it is 4 MPH high.
I have a 94 f250 2wd 7.3 idi trubo with 410 gears and an e4od.
Where does the speedometer get its readings from? I cleaned the VSS on the rear end but it didn't change anything.
I have a 94 f250 2wd 7.3 idi trubo with 410 gears and an e4od.
Where does the speedometer get its readings from? I cleaned the VSS on the rear end but it didn't change anything.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Oversize tires will make your speedometer read LOWER than your actual speed, unless you recalibrate the PSOM. And yes, it does get the speed from the VSS. If the speedometer isn't fluctuating, the VSS signal is most likely good, and you just have to contend with the fact that our speedometers are not all that accurate.
Thread Starter
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Senior User
Joined: Jul 2010
Posts: 170
Likes: 0
From: Western SD
Oversize tires will make your speedometer read LOWER than your actual speed, unless you recalibrate the PSOM. And yes, it does get the speed from the VSS. If the speedometer isn't fluctuating, the VSS signal is most likely good, and you just have to contend with the fact that our speedometers are not all that accurate.
Is there any way of resetting the amount of calibrations?
Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
Oversize tires will make your speedometer read LOWER than your actual speed, unless you recalibrate the PSOM. And yes, it does get the speed from the VSS. If the speedometer isn't fluctuating, the VSS signal is most likely good, and you just have to contend with the fact that our speedometers are not all that accurate.
yeah, i totally misread the OP's post. Thanks for clarifying.
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