Thread: P0171 open loop

Originally Posted by darkhorizon

In open loop, the pcm can remember fuel trims from when it has ran in closed. Be sure to clear any fuel trims before you switch to open loop.

by clear do you mean just reset them when I switch to open loop or do I have to do something in the closed loop section of the tune itself?

sorry just confused by what you mean by "clear" the trims...