Larger tires affecting speedometer
#16
What also might help is you can take a video of what you're doing and post to YouTube so we can see if you're missing a step or something.
#17
#18
How can you rebuild a PSOM other than change the caps?
I would like to see what math they used to do that.
I would like to see what math they used to do that.
#19
Making sure things don't fall off is a good start, this was my issue back a few years ago...
https://www.ford-trucks.com/forums/7...ml#post6657625
No idea, you would need to ask them. I do remember on the site I found (years ago) that if I had to buy a new PSOM where I told them what mileage to program, they required a document to be signed stating that was the true mileage of the vehicle.
https://www.ford-trucks.com/forums/7...ml#post6657625
Originally Posted by subford
I would like to see what math they used to do that.
#21
#23
Just wanted to update this thread. I went out to try one more time to recalibrate the speedometer. I tried grounding the PSOM to several points around the cab that I felt sure would give a good ground, no luck any time. Finally I stuck the wire behind a screw that is holding the door panel on, a last resort before giving up really. Well, it worked!
Thanks to all who helped, and provided the link to reprogramming.
Thanks to all who helped, and provided the link to reprogramming.
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