Truck will just go to 10.8 FRP psi. Sometimes and then come back to normal. Been doing it a lot more the last couple days. FRP and DFRP always stay the same so my guess is something is telling it to defuel. This always happens when your going about 70 and rpm is prolly 1800 in overdrive so not like I'm giving it hell and the tranny slipping just cruising. And help would b great thanks.
Defueling problem
- Thread starter Shieldsinc
- Start date
Whens the last time your fuel filter was changed?Should do a bottle test to see how much fuel is returning,could be bad injectors returning to much fuel.
Does it take a very fast, drastic drop to 10.8? Very likely could be your FPRV! This is the most common cause... Is your desired staying up and the actual falling to 10.8? Or is desired and actual dropping to 10.8?
As josh said, a datalog would help!
As josh said, a datalog would help!