LTFTs after filling gas tank
#1
LTFTs after filling gas tank
I noticed on the last 3 gas tank fillups the LTFTs will go anywhere from -10 and about -20. I thought it was just a missreading but it dose it everytime after I fill the tank. Is this common after filling up? Why does it do this?
#3
Staging Lane
iTrader: (2)
For those reading this 6 years later: The basic idea is that the evap system pulls the gas fumes from the fuel tank (charcoal canister) into the intake manifold to be used in combustion. If for some reason too much gas vapor is being pulled into the intake manifold, the fuel injectors won't be able to slow down enough to compensate, causing the car to run rich (negative LTFT's).
This obviously shouldn't normally happen but slight issues with the evap system can cause this. No serious harm is being done.
This obviously shouldn't normally happen but slight issues with the evap system can cause this. No serious harm is being done.