Airflow Sensor (Fox & JETTA GLI)
- Start engine to pressurized fuel system. Turn engine off and remove intake boot from top of airflow sensor. Disconnect coil secondary wire from coil and jumper to ground.
- Check sensor play by slowly moving sensor plate through travel range with a magnet. See Fig 1
. Resistance should be felt. Move plate back to the rest position. There should be no resistance. If binding is felt, loosen sensor plate hold-down bolt and adjust plate to center of venturi.
- If resistance is uneven, remove airflow sensor from housing to clean and lubricate lever assembly. If resistance is caused by control plunger, remove and clean control plunger assembly. If binding continues, replace fuel distributor.
- Check position of airflow sensor plate. Airflow sensor plate edge must be within .075" (1.9 mm) below the narrowest section of the venturi. If not, bend sensor spring until correct specification is obtained. Ensure a small gap exists between sensor lever and control plunger.
Courtesy of VOLKSWAGEN UNITED STATES, INC.