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 744 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST CROSSOVER PIPE 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 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Install the exhaust crossover pipe.
CAUTION: Refer to FASTENER NOTICE in Cautions and Notices.
Install the exhaust crossover pipe bolts.
Tighten

Tighten the exhaust crossover pipe bolts to 25 N.m (18 lb ft).

Fig 1: Installing Exhaust Crossover Pipe
Courtesy of GENERAL MOTORS CORP.
Install the exhaust crossover pipe heat shield.
Install the exhaust crossover pipe heat shield bolts.
Tighten

Tighten the exhaust crossover pipe heat shield bolts to 10 N.m (89 lb in).

Fig 2: Installing Exhaust Crossover Pipe Heat Shield

Courtesy of GENERAL MOTORS CORP.

Install thermostat by-pass pipe assembly. Refer to THERMOSTAT BYPASS PIPES REPLACEMENT in Engine Cooling.
Install the air cleaner assembly.
Inspect for exhaust leaks.

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.