What is the purpose and components of the Secondary Air Injection (AIR) system,Secondary Air Injection Check Valve and Secondary Air Injection Pump?

Certain engines, such as the 4.3L V6, 5.7L V8, and 7.4L V8 engines, are equipped with a Secondary Air Injection (AIR) system. The purpose of this system is to reduce the levels of unburned hydrocarbons (HC) and carbon monoxide (CO) in the exhaust gases by introducing fresh air into hot exhaust gases flowing through the exhaust manifolds. The AIR pump, vacuum control solenoid, check valves, shut-off valve, and hoses and pipes are some of its components. The AIR pump sucks filtered outside air and pushes it into the exhaust manifolds under the control of the PCM. The AIR shut-off valve is controlled by the vacuum control solenoid to open up and allow air from the pump to pass through to get to check valves. These check valves block backflow of exhaust gases inside the AIR system. Some signals that activate it include coolant temperature or engine deceleration when determined by PCM. If certain conditions are met, PCM can deactivate its electric clutch for AIR pump. If simple checks do not solve a problem, then checked or replaced should be done only at a qualified repair shop's.

Genuine Chevrolet Express Secondary Air Injection Check Valve

SAI Check Valve

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5 Secondary Air Injection Check Valves found

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Chevrolet Express Valve Assembly, Secondary Air Injection Check
Part Number: 12567733
- Other Name: VALVE, Emission Control System; Check Valve
- Replaces: 12558992
$102.26 MSRP: $212.32
You Save: $110.06 (52%)
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Fits the following Vehicles:
2001-2002 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.7L, 8 Cyl 8.1L
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Chevrolet Express Valve Assembly, Pulsed Secondary Air Injection Engine Shutof
Part Number: 12550930
- Other Name: VALVE, Emission Control System; Air Injection Reactor Pump Valve
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Fits the following Vehicles:
1996-2000 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER | 8 Cyl 7.4L
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Chevrolet Express Valve Assembly, Secondary Air Injection Vacuum Control Solenoid
Part Number: 1997264
- Other Name: SOLENOID, Emission Control System; Diverter Valve, Solenoid, Solenoid Valve
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Fits the following Vehicles:
2001-2002 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.7L, 8 Cyl 8.1L
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Chevrolet Express Valve Assembly, Secondary Air Injection Check
Part Number: 12555165
- Other Name: VALVE, Emission Control System; Diverter Valve
More Info
Fits the following Vehicles:
2001-2002 Chevrolet Express | 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.7L
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Chevrolet Express Valve Assembly, Secondary Air Injection Check
Part Number: 12562568
- Other Name: VALVE, Emission Control System; Check Valve, Solenoid
- Replaces: 22040897
More Info
Fits the following Vehicles:
1996-2000 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER | 8 Cyl 7.4L
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Chevrolet Express Secondary Air Injection Check Valve Parts Questions & Answers

Valve Assembly, Secondary Air Injection Check
12567733
Q: What is the purpose and components of the Secondary Air Injection (AIR) system,Secondary Air Injection Check Valve and Secondary Air Injection Pump?
A: Certain engines, such as the 4.3L V6, 5.7L V8, and 7.4L V8 engines, are equipped with a Secondary Air Injection (AIR) system. The purpose of this system is to reduce the levels of unburned hydrocarbons (HC) and carbon monoxide (CO) in the exhaust gases by introducing fresh air into hot exhaust gases flowing through the exhaust manifolds. The AIR pump, vacuum control solenoid, check valves, shut-off valve, and hoses and pipes are some of its components. The AIR pump sucks filtered outside air and pushes it into the exhaust manifolds under the control of the PCM. The AIR shut-off valve is controlled by the vacuum control solenoid to open up and allow air from the pump to pass through to get to check valves. These check valves block backflow of exhaust gases inside the AIR system. Some signals that activate it include coolant temperature or engine deceleration when determined by PCM. If certain conditions are met, PCM can deactivate its electric clutch for AIR pump. If simple checks do not solve a problem, then checked or replaced should be done only at a qualified repair shop's.