Sentra L4-1597cc 1.6L SOHC (E16S) (1985)
Pulsed Secondary Air Injection: Description and Operation
Cold Engine
Fig. 49 Air injection valve system operation, Cold Engine.
The air injection valve system delivers secondary air to the exhaust manifold, utilizing a vacuum caused by exhaust pulsation in the exhaust manifold.
Specific operating conditions are outlined in Fig. 49.