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Fun fact, if your ABS computer is programmed for aftermarket tire size, you need to leave the tire size as default or it won't be accurate.
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The MPH correction only uses ABS speed and a tire size ratio to calculate the speed. We do use the tire size, speed, RPM, rear end ratio and transmission selected to calculate the gear and transm
Since I updated to 2.7 my engine speed has been off. It changes, but it's about 15mph higher than actual. It's not the app as I tried downgrading it and it made no difference. Around the same time I saw my fuel pressure was 16-18 where it had been 12-14 before. I thought maybe there had been a bad connection and plugging the plug back in showed a more true pressure reading. Today I was taking my son to daycare and it showed 60psi as my fuel pressure. That scared me a little so while driving I shut the engine off for a sec then keyed it back on (manual trans) and it started running again. The fuel pressure didn't change but I noticed my vehicle speed was correct this time, and stayed correct the rest of the trip. After I got to work I shut off the truck and turned the key to run without starting, the fuel pressure showed as 30, then 44 when I turned it on. Just now an hour later I did the same thing it read 4 & 18psi. Any ideas why it would read like this?