Adjusting the position of the air flow meter pressure disc (Audi 80 B2)

Make sure that when the engine is not running, the pressure disk is level or no more than 0.5 mm below the beginning of the expanding cone of the air flow meter diffuser.

If necessary, adjust the position of the air flow meter pressure disk by bending the spring of bracket 2 (see photo), after first removing the lower housing of the mixture regulator.

Note: If the air flow meter pressure plate is positioned above the specified level, backfiring will occur during misfires. If the pressure plate is positioned too low, starting of both a cold and hot engine will be difficult.

Check the centering of the pressure disc by placing a 0.10 mm thick gasket in sequence at four points around the circumference.

If the pressure disk is in the wrong position, lower the adjusting screw 3 and center the pressure disk, then tighten screw 3 to a torque of 0.5 kgf·m.

Adjust engine idle speed.