Ford Excursion :: 2000 - Speedometer Is Off By 10 MPH At Freeway Speeds
Aug 26, 2016
I have a 2000 6.8L V10 Ex, and I'm currently working through the last thing on my "to fix" list. The truck has 37" tires (Nitto Mud Grapplers), and at freeway speeds the speedometer is off by 10mph. If it reads 60mph, I'm really going about 70mph.
I thought the solution was to order an SCT flash tuner, so I purchased one with tunes from 5startuning:
**1. SCT 7015 - X4 Flash Device with Choice of 5 Star Tuning Custom Tunes - 5 Star Tuning
I choose the correct Revs per mile for my tire (560), but the speedo is STILL 10mph off at 70mph.
No changes that I made to the tire size or axle ratio made any difference. It always read the same amount off. The SCT X4 flash tuner wasnt able to change the speedo on the 2000 Ex's.
[URL] ....
My question is this: If both of those tuners plug into the exact same port, and use the same parameters, why is it my X4 tuner can't change the speedo, yet this other tuner is able to? It doesn't make any sense to me. If the X4 truly cannot change the speedo of certain model years, there should really be a disclaimer about it. Feels like a bit of a rip off since the only reason I purchased it in the first place was to correct my speedo...
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So any clues as to what the shop missed last time and is it worth rebuilding again. Truck is only worth a bit more than the cost of shop time.
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