1982 Sapporo L4-2555cc Powertrain Management | Emission Control | Secondary Air Supply
Pulse Air Feeder: Description and Operation
Fig. 4 Secondary air supply system. Models w/pulse air feeder (Typical)
Secondary Air Supply System. 1982-83 exc. Pickup
MODELS W/PULSE AIR FEEDER
On this system, Fig. 4, a Pulse Air Feeder (PAF) is used to supply secondary air to the exhaust system between the front and rear catalytic
converters. This secondary air combines with exhaust gasses to promote further oxidation in the rear catalytic converter.
A main and sub-reed valve is incorporated in the Pulse Air Feeder. The main reed valve is actuated by a diaphragm which senses pressure
pulsations caused by piston movement in the No. 3 cylinder. The sub-reed valve is actuated by exhaust gas vacuum caused by pulsations in the
exhaust system between the front and rear catalytic converters.