Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 35 (ENGINE CONTROL SYSTEM - SYSTEM & COMPONENT TESTING)AIR INDUCTION SYSTEMSAUXILIARY INTAKE AIR SYSTEMVACUUM CHECK VALVE INSPECTION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Vacuum Check Valve Inspection
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Vacuum Check Valve Inspection
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Numbers in parenthesis in the test steps correspond to those in figure. See Fig 1
.
- Remove the vacuum check valve (1) from the auxiliary intake air system. See Fig 1 .
- Connect Hand Vacuum Pump (J 23738-A), or equivalent, to the intake manifold side of the vacuum check valve. See Fig 2 .
- Attempt to apply a vacuum of 10 in. Hg to the vacuum check valve.
- The check valve should NOT hold vacuum pressure.
- Disconnect the vacuum pump from the check valve.
- Connect the hand vacuum pump to the other side of the check valve.
- Apply a vacuum of 10 in. Hg to the vacuum check valve.
- The check valve SHOULD hold vacuum pressure.
- Replace the vacuum check valve if the valve failed either of the previous tests.
- Install the vacuum check valve (1).
- Ensure check valve (1) is installed with the side that holds vacuum toward the intake air control solenoid (4). See Fig 1 .
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.