Air Injection System Check Valve Replacement
What is an air pump check valve?
The air pump check valve is a one way valve that allows air from the air pump to enter the exhaust system. More importantly, it prevents hot exhaust gases from entering the Secondary Air Injection System.
How does the air pump check valve work?
The check valve can be vacuum operated or strictly mechanical in nature. A mechanical valve will simply let pressurized airflow in only one direction. A vacuum operated check valve will use a controlled vacuum source to open and close the valve at the appropriate time.
When the air pump check valve is malfunctioning, the vehicle may perform normally, but may fail an emissions inspection and get poor gas mileage. The Check Engine Light may illuminate with a code set for the secondary air injection system.