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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 145 (ENGINE CONTROL SYSTEM - SYSTEM & COMPONENT TESTING)AIR INDUCTION SYSTEMSAUXILIARY INTAKE AIR SYSTEMAUXILIARY INTAKE AIR DOOR INSPECTION
1999 GMC Forward Control 5.7 R, Automatic
Auxiliary Intake Air Door Inspection
1999 GMC Forward Control 5.7 R, AutomaticSECTION Auxiliary Intake Air Door 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.
- To view the operation of the auxiliary intake air door, remove the air cleaner cover and air cleaner element.
- Verify auxiliary intake air door is OPEN.
- If the intake air door is closed test for a faulty intake air control solenoid.
- Disconnect the vacuum hose to the auxiliary intake air door motor.
- Check if auxiliary intake air door is OPEN.
- Replace the air cleaner assembly if the intake air door is closed.
- Connect the Hand Vacuum Pump (J 23738-A), or equivalent, to the intake air door motor.
- Apply a vacuum of 10 in. Hg to the intake air door motor.
- The intake air door motor should CLOSE and HOLD vacuum.
- Replace the air cleaner assembly if the intake air door fails the previous test.
- Connect the hand vacuum pump to the vacuum storage chamber on the air cleaner upper assembly.
- Apply a vacuum of 10 in. Hg to the storage chamber.
- The vacuum chamber should HOLD the vacuum pressure.
- Replace the air cleaner assembly if the vacuum storage chamber looses pressure.
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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.