Active Fuel Management Disable

[aleroguy85]

Hi, does anyone know if you can turn off the AFM in something like the LS4 motor? I assume you would have to tune the ecm to have it disabled but I don't know what else. Thanks.

[TiredGXP]

Hi, does anyone know if you can turn off the AFM in something like the LS4 motor? I assume you would have to tune the ecm to have it disabled but I don't know what else. Thanks.

Tuning software such as HPTuners can disable AFM/DOD functions - It's just a flag on the Engine---> Fuel Control---> COT,Lean Cruise screen for the LS4.

I suppose you could physically disable it by disconnecting the solenoids that supply to the AFM/DOD lifters. These solenoids are designed to fail in the closed position, so the lifters can't collapse. Probably throw a few codes though.

[IsaacHayes]

Then you should be able to swap to normal lifters correct?

[TiredGXP]

Yeah, but on the LS4 you need new lifter retainer trays too.

[IsaacHayes]

You could swap that from LS1 though right?

[TiredGXP]

You could swap that from LS1 though right?

Yup.