Back to Tech Page.The following is courtesy of Pat Braden.
It is a modification to improve throttle response.
Follow these steps:
1. Locate the Air Flow Meter. To find it, first find the filter. On GT-S Corolla's, FX-16's, 1983-86 Celica's with EFI and MR2's, the airflow meter will be the square metal box with the black plastic lid located on top of the air filter canister. On 1982-86 Supras, the airflow meter is the square box with the black plastic lid located on the pipe between the air filter box and the intake manifold. For 1987, the Turbo Supra recieved a different type of airflow meter, so this adjustment cannot be made.
2. Remove the black plastic lid of the airflow meter by cutting the silicone seal with a razor and gently prying it out.
3. To adjust the airflow meter, begin by clearly and permanently marking the location of the hold-down clamp on the gear wheel. This enables you to return to the stock adjustment if necessary.
4. Next, loosen the hold-down clamp set screw and rotate the gear wheel three to five teeth counterclockwise (one or two teeth when TRD big injectors are fitted). Retighten the hold-down clamp set screw. Do not exceed five teeth because the engine will bog between shifts. This adjustment will improve throttle response and allow the engine to rev freely.
5. Reseal the black plastic lid with silicone calking compound. Check the integrity of the seal by looking at it carefully; the electronics are easily damaged by moisture.
