exhaust

Air Injection Check Valve

for 2017 Chevrolet Silverado 1500 5.3L V8 EcoTec3 L83 · RWD

Difficulty

Moderate

Time

1.0 h

Tools

Steps

✓Fact-checked. Built from OLP's spec database, then independently fact-checked line by line with every correction applied. Master-tech sign-off by Chris Hackleman is queued. Cross-check torque values against the factory manual, and stop if anything looks unsafe. How our data is made.

This procedure covers the removal and replacement of the air injection check valve on the 2014-2018 Chevrolet Silverado 1500 with the 5.3L V8 L83 engine, which prevents exhaust gases from flowing back into the secondary air injection system.

Warnings

⚠️Allow engine and exhaust system to cool completely before beginning work. Exhaust components can remain hot for over an hour after engine shutdown.

⚠The air injection system operates under high temperatures. Inspect all related components for heat damage during service.

ℹ️The check valve prevents exhaust backflow into the air injection pump. A failed valve can damage the pump and cause check engine lights.

Tools required

10mm socket and ratchetEssential

13mm socket and ratchetEssential

15mm socket and ratchetEssential

Torque wrenchEssential

PliersEssential

Anti-seize compoundEssential

Jack and jack stands

Penetrating oil

Wire brush

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Parts

Air injection check valve × 1 — Use OEM specification
Air injection pipe gasket × 1 — Use OEM specification

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Preparation

Park vehicle on level surface and allow engine to cool completely for at least 2 hours
Disconnect negative battery cable to prevent electrical issues
Raise and support vehicle on jack stands if accessing from below is necessary for your specific configuration
Spray penetrating oil on all fasteners to be removed and allow to soak for 10-15 minutes

Procedure

1
Access the air injection check valve
Locate the air injection check valve on the driver's side of the engine between the air injection pump and the exhaust manifold. Remove any heat shields blocking access by removing the retaining bolts.
Torque spec
Heat Shield Bolts10 Nm (7 lb-ft)
2
Disconnect electrical connections
If equipped, disconnect any electrical connectors to the air injection pump or related solenoid valves. Press the locking tabs and pull connectors straight off to avoid damage.
3
Remove air injection pump inlet hose
Loosen the hose clamp securing the air inlet hose to the air injection pump using pliers or a flathead screwdriver. Remove the hose and set aside.
4
Disconnect check valve inlet pipe
Remove the mounting bolts securing the air injection pipe from the pump to the check valve. There are typically two bolts on the pump side. Carefully separate the pipe from the pump, being mindful of the gasket.
Torque spec
Mounting Bolts34 Nm (25 lb-ft)
5
Remove check valve to exhaust pipe connection
Locate the flange connection between the check valve outlet and the exhaust manifold or catalytic converter. Remove the flange bolts securing this connection. The check valve may be integrated into the pipe assembly.
Torque spec
Exhaust Flange Bolts45 Nm (33 lb-ft)
6
Remove check valve assembly
Once all connections are disconnected, carefully remove the check valve assembly from the vehicle. Note the orientation and routing of all pipes for reinstallation. Inspect the old valve for carbon buildup or damage.
7
Clean mating surfaces
Use a wire brush to clean all gasket surfaces on the air injection pump flange and exhaust connection points. Remove all old gasket material, carbon deposits, and corrosion to ensure proper sealing.
8
Install new check valve
Position the new air injection check valve assembly, ensuring the arrow on the valve body points toward the exhaust (flow direction). Install new gaskets at all connection points.
9
Connect check valve to exhaust
Apply anti-seize compound to the flange bolt threads. Install and hand-tighten the flange bolts connecting the check valve outlet to the exhaust manifold or pipe. Torque bolts to specification in a crisscross pattern.
Torque spec
Exhaust Flange Bolts45 Nm (33 lb-ft)
10
Reconnect air injection pump pipe
Install a new gasket on the air injection pump connection. Position the pipe from the check valve to the pump and install mounting bolts. Torque to specification.
Torque spec
Mounting Bolts34 Nm (25 lb-ft)
11
Reinstall air inlet hose and electrical connections
Reconnect the air inlet hose to the air injection pump and secure with the hose clamp. Reconnect all electrical connectors, ensuring they click into place securely.
12
Reinstall heat shields
Reinstall any heat shields removed for access. Install and torque the heat shield bolts to specification.
Torque spec
Heat Shield Bolts10 Nm (7 lb-ft)

Reassembly

Reconnect the negative battery cable
Lower vehicle from jack stands if raised
Double-check all connections are tight and properly secured
Ensure no tools or parts were left in the engine compartment

Verification

Start the engine and listen for any unusual hissing or exhaust leaks around the check valve connections
Allow engine to reach operating temperature and verify no leaks develop
Check for diagnostic trouble codes using a scan tool - codes P0410, P0411, or P0412 indicate air injection system problems
During cold start, listen for the air injection pump operation (typically runs for 60-120 seconds)
Verify exhaust smell is normal with no indication of raw air being pumped into exhaust