Pulsair Valve: Secondary Air Injection for Wrangler L4-150 25L VIN H TBI (1986)
Pulsair Valve: Description and Operation
Fig. 22 Pulse air system. 4-150 & 6-258
This system, Fig. 22, which is used on 4-150 and 6-258 carbureted engines, uses the alternating exhaust pressure pulsations instead of an air pump to
inject air into the exhaust system. Air is routed from the air cleaner through a hose to the air control valve which is controlled by an air switch solenoid.
The air switch solenoid is in turn controlled by the CEC system Micro Computer Unit (MCU). At the appropriate signal from the CEC system, the air
control valve is opened and air is allowed to flow through the air injection check valve. From there the air enters the exhaust stream either at the front
exhaust pipe (upstream) or at the catalytic converter (downstream) depending on which of the air injection circuits has been opened.
