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2013 Ford F-250 6.7 Lariat
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Discussion Starter · #1 ·
Hi all,

I programmed my dad's 2016 6.7 with forscan following the spreadsheet for tire size. Upon attempting to do the PCM relearn, it said I had to return to the stock tune if I was tuned.

What would happen if I relearned PCM on the custom tune that's on it? If I return to stock then tune again, the tuner changes the tire size line back anyway, so that would negate the whole purpose.

Thanks in advance!
 

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So a message in ForScan told you to go back to stock??
 

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2013 Ford F-250 6.7 Lariat
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163 Posts
Discussion Starter · #3 ·
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