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

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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6 Secondary Air Injection Check Valves found

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Chevrolet Express Valve Assembly, Secondary Air Injection Check
Part Number: 12567733
$106.90 MSRP: $218.06
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Product Specifications
- Other Name: VALVE, Emission Control System; Check Valve
- Replaces: 12558992
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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
Product Specifications
- Other Name: VALVE, Emission Control System; A.I.R. Pump Valve
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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
Product Specifications
- Other Name: SOLENOID, Emission Control System; Diverter Valve, Solenoid, Solenoid Valve
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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
Product Specifications
- Other Name: VALVE, Emission Control System; Diverter Valve
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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
Product Specifications
- Other Name: VALVE, Emission Control System; Check Valve, Solenoid
- Replaces: 22040897
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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 Shutoff
Part Number: 12557825
Product Specifications
- Other Name: VALVE, Emission Control System
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001 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

Chevrolet Express Secondary Air Injection Check Valve

The Chevrolet Express Secondary Air Injection Check Valve permits pressurized fresh air into the exhaust stream but prevents hot gases from flowing back through it. This protects the air pump and reduces harmful emissions. The Secondary Air Injection Check Valve opens when the pump goes ahead and feeds air to the exhaust manifold when pumping starts at cold. This lets oxygen burn off the leftover fuel. It then closes when backpressure builds up or if airflow is sent to the catalytic converter. A second Secondary Air Injection Check Valve sits ahead of the converter and does the same job to verify that each stage gets air introduced at the right time. The early vans had vacuum-operated metal Secondary Air Injection Check Valve units and belt-driven pumps. Later versions kept the function but packaged it with electric pumps and lighter composite shells. Every Secondary Air Injection Check Valve, no matter the style, only reacts to pressure and only flows one way. If either valve sticks or leaks, the Chevrolet Express engine control module uploads an emission fault and fuel economy may drop on the Chevrolet model, so every Express driver must attend to it as soon as possible.

Each OEM Chevrolet Express Secondary Air Injection Check Valve we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.

Chevrolet Express Secondary Air Injection Check Valve Parts Questions & Experts 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 on Chevrolet Express?
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.