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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1785 (ENGINE CONTROLS AND FUEL - 2.2L (L61) - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSTHROTTLE BODY ASSEMBLY REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Shop Towel Over The Throttle Body Opening

Courtesy of GENERAL MOTORS CORP.

Remove the shop towel from the throttle body opening.

Fig 2: Removing/Installing Throttle Body Gasket

Courtesy of GENERAL MOTORS CORP.

Install the throttle body gasket.

NOTE: Refer to Fastener Notice .

Install the throttle body assembly and bolts.
Tighten: Tighten the throttle body-to-intake manifold bolts - L61 to 10 N.m (89 lb in).

Fig 3: Disconnecting/Connecting Throttle Body Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Connect the throttle body electrical connector.

Fig 4: Identifying Outlet Resonator/Duct Assembly

Courtesy of GENERAL MOTORS CORP.

Position the outlet resonator/duct assembly into position.
Connect PCV fresh air vent hose assembly.
Tighten the clamp at throttle body assembly.
Position the outlet resonator/duct assembly up with support bracket and install the push-pin.
Tighten the clamp at the air cleaner assembly.
Connect the IAT sensor connector.
Turn the ignition ON for one minute while the engine control module (ECM) automatically relearns throttle position.

RENDER: 1.0x

NO RELATED

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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.