Capri L4-1597cc 1.6L DOHC Turbo (1991)
Vane Air Flow (VAF) Meter: Description and Operation
Vane Air Flow (VAF) Meter
The Vane Air Flow (VAF) meter measures air flowing into the engine intake system and is mounted between the air cleaner and the throttle body
assembly. The VAF meter contains a potentiometer that connects to a movable vane. As air flows through the VAF meter, the movable vane and
potentiometer change position and provide an input to the Electronic Control Assembly (ECA) with vane position information. Inside the VAF meter is a
fuel pump switch which provides a ground for the fuel pump circuit after the engine has started. The ECA can translate vane position information into
the volume of air flowing into the engine to make adjustments to the air/fuel mixture and purge flow.
