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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1410 (ENGINE CONTROL SYSTEM - 4.2L (INTRODUCTION))REPAIR INSTRUCTIONSSECONDARY AIR INJECTION (AIR) SOLENOID VALVE REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Removing/Installing AIR Solenoid Valve

Courtesy of GENERAL MOTORS CORP.

Install the AIR solenoid valve (4) and the gasket (5) to the engine.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the 2 AIR solenoid valve studs (3).
Tighten: Tighten the studs to 25 N.m (18 lb ft).
Install the transmission fluid level indicator tube (2) to the AIR solenoid valve stud (3).
Install the nut (1) securing the transmission fluid level indicator tube (2) to the AIR solenoid valve.
Tighten: Tighten the nut to 10 N.m (89 lb in).

Fig 2: Disconnecting/Connecting Electrical Connector & Air Outlet Pipe From AIR Solenoid Valve

Courtesy of GENERAL MOTORS CORP.

Connect the AIR pump air outlet pipe to the AIR solenoid valve.
Connect the electrical connector to the AIR solenoid valve.
Install the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.