Same here, I posted this in another thread. I'll repost it here just to keep this consolidated.
terpman86 wrote:
2008 F250 6.4L, using the U7164 (v.9r12a) last update was 06/2010
I've had the device since 10/2009 and it has worked fantastically for me. Average about 17.5mpg with the 50hp economy tune (city and highway combined, usually negligible load in the back). Straight highway with the 50hp tune usually gets me 22mpg.
Only problem I've had has just recently come up after I took my truck in to the Ford dealer for a recall on the computer yesterday. According to the invoice I got from them, they had to reprogram the computer to fix a potential issue with the reduced power mode when water in fuel was detected. I restored the factory tune before I took it in to the dealer and when I tried to retune my truck this morning I got a message saying that the feature was not supported by my vehicle. I have lost the recall notice so I don't know when it was issued or when Ford started to reprogram the computers.
Any ideas on what a fix might be for this? Thanks for your help!
CALIDS - Unit 1: 8U7A-14C204-CH
Unit 2: 7U7A-14C337-AB