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 234 (ENGINE CONTROLS - REMOVAL & INSTALLATION)EMISSION SYSTEMS & SUB-SYSTEMSSECONDARY AIR INJECTION SHUT-OFF VALVEINSTALLATION

1999 GMC Forward Control 5.7 R, Automatic

Secondary Air Injection Shut-Off Valve: Installation

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation

WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

Connect the bank 1 AIR shut-off valve with a NEW gasket to the bank 1 AIR outlet pipe. Install the three bolts securing the bank 1 AIR shut-off valve to the engine. Tighten the three bolts to specification. See TORQUE SPECIFICATIONS .
Install the vacuum lines. Reconnect the bank 1 AIR intermediate pipe/hose and clamp to the bank 1 AIR shut-off valve. Raise and support the vehicle. Install the 2 nuts securing the bank 1 AIR outlet pipe to the exhaust manifold. Tighten the 2 nuts to specification. Lower the vehicle.

Fig 1: Locating AIR Solenoid & Bank 1 AIR Shut-Off Valve

Courtesy of GENERAL MOTORS CORP.

Install the bank 2 AIR shut-off valve and NEW gasket to the bank 2 outlet pipe. Install the 2 nuts securing the shut-off valve to the bracket. Tighten the nuts to specification. See TORQUE SPECIFICATIONS .
Install the bank 2 intermediate pipe/hose and clamp to the shut-off valve. Install the vacuum lines. Install the air cleaner assembly.

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.