"Air Flow Meter Adjustment. Consult your factory shop manual to determine the location of the air flow meter. The adjustment will allow you to richen or lean the mixture from factory settings.The air flow meter is a metal box with a black plastic id,usually found on top of the air filter canister or, on Supras, on the intake manifold.
Cut the silicone seal holding the black plastic lid in place.Use caution so plasticl id is not cut; a water-tight seal is critical as moisture wreaks havoc on the electrics, Gently pry the lid from the housing.,Air flow meter with plastic lid removed.
Note gear and hold-down clamp set-screw (arrows). See text for modification.To adjust,first mark the original location of the hold-down clamp on the gear wheel so you can return to stock setting if necessary.
Loosen the clamp set-screw and rotate the qear wheel 3 to 5 teeth in either direction. Clockwise leans the mixture; counter-clockwise richens it. Providing a more rich mixture will generally increase top-end power at the expense of off-idle performance, a modification well suited to the race track . A 5-tooth adjustment will usually cause the motor to bog down between shifts:Be careful to seal the plastic lid with silicone after adjustment.
"
