2009 F-150 Intune I2 tire size

[jbjchevy]

I have a 2009 F150 4X4 Lariat crew cab. I purchase the I2020 to fix the tire size so my speed would be right. I have done all the updates and tried to tune the truck with the 87 octane and putting my tire size in and rear end gear size witch is 3.55 . loaded fine went out to test on my phone with the GPS doing 50 on truck I'm doing 55 on GPS. Any ideals? Thanks Jim

[06MonteSS]

re-adjust it until it's correct.. actually measure your tire from the ground to the top of the tire, and you'd enter in that inches amount for the tire height..

[jbjchevy]

Ok I try changing size by putting in the measurement of the tire height and that did not work . I try many different measurements and still didn't work. I ended up getting a check engine light so restored to default settings...

[mikel]

did you adjust the param called enable tire/gear change?

you must change that for tire or gear changes to take effect.