New Yorker V8-318 5.2L VIN M 4-bbl (1982)
Pulse Air Feeder: Description and Operation
Pulse Air Feeder (PAF) System
Fig. 34 - Pulse Air Feeder (PAF) System
PULSE AIR FEEDER (PAF) SYSTEM
This system, Fig. 34 is used on 1981-82 vehicles with 4.156 (2.6 liter) engines. It supplies secondary air into the exhaust system between the front
and rear catalytic converters in order to promote the oxidation of exhaust emissions in the rear catalytic converter.
The PAF consists of a main reed valve and sub reed valve.
The main reed valve is actuated in response to movement of a diaphragm which is activated by pressure pulsation generated by the reciprocating
motion of the number 3 piston. The number 3 cylinder crankcase is sealed by a seal cover which has a small hole for discharging engine oil and
blow by gases.
The sub-reed valve is actuated by exhaust vacuum generated from pulsation in the exhaust system between the front and rear catalytic converters.
