Diplomat V8-318 5.2L VIN M 4-bbl (1982)
Pulse Air Feeder: Description and Operation
Aspirator Air System
NOTE: This system is used on catalyst equipped vehicles except; California V8-360 with 4 barrel carb. and high altitude calibration and all 1979
vehicles--except models with California emissions.
Fig. 9
PURPOSE
To reduce CO and HC emissions.
OPERATION
This valve uses exhaust pressure pulsations to draw air into the exhaust system to reduce CO and HC emissions.
It draws fresh air from the "clean" side of the air cleaner, past a one-way spring loaded diaphragm. The diaphragm opens to permit fresh air to mix
with the exhaust gases during negative pressure--vacuum--pulses. When the pressure is positive, the diaphragm closes and no exhaust gases are
allowed to flow past the valve.
The aspirator valve works most efficiently at idle and slightly above idle when the negative pulses are maximum.
At higher engine speed, the aspirator valve remains closed.
