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 1313 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST PIPE REPLACEMENT (DUAL)INSTALLATION 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 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: To prevent internal damage to the flexible coupling of the catalytic converter assembly, the converter must be supported. The vertical movement at the rear of the catalytic converter assembly must not exceed 6 degrees up or down.

Position the exhaust pipe under the vehicle and support the pipe.
Install the insulators to the exhaust pipe.
Install the exhaust muffler inlet pipe clamps. Do not tighten the exhaust muffler inlet pipe clamp nuts.
Install the exhaust pipe to the mufflers.
NOTE: Refer to FASTENER NOTICE .
Tighten the exhaust muffler inlet pipe clamp nuts.
Tighten

Tighten the exhaust muffler inlet pipe clamp nuts to 50 N.m (37 lb ft).

Fig 1: Exhaust Pipe, Muffler, Pipe Clamp & Nuts
Courtesy of GENERAL MOTORS CORP.
Install a new catalytic converter gasket.
Install the catalytic converter bolts.
Tighten

Tighten the catalytic converter bolts to 45 N.m (33 lb ft).
Remove the support from the exhaust system.

Fig 2: Catalytic Converter Gasket & Bolts
Courtesy of GENERAL MOTORS CORP.
Inspect for exhaust system leaks and underbody contact.
Lower the vehicle.

Fig 3: Exhaust System
Courtesy of GENERAL MOTORS CORP.

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.