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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 1732 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - RIGHT (4.3L ENGINE)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 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Install the exhaust manifold heat shield, if required.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the exhaust manifold heat shield bolts.
Tighten

Tighten the bolts to 9 N.m (80 lb in).

Fig 1: Installing Exhaust Manifold Heat Shield & Bolts - Right (4.3L)
Courtesy of GENERAL MOTORS CORP.

Important: To assist in installing the exhaust manifold and gasket to the engine, tabs on a NEW exhaust manifold gasket will hold the gasket and bolts in place.
Install NEW exhaust manifold gaskets to the exhaust manifold.
Ensure that the exhaust manifold bolts, and plug wire shields are held in place by the tabs on the exhaust manifold gaskets.

Fig 2: Installing Exhaust Manifold Gaskets - Right (4.3L)
Courtesy of GENERAL MOTORS CORP.
Install the exhaust manifold and plug wire shields.
If reusing the old fasteners, apply threadlock GM P/N 12345493, (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts.
Tighten the exhaust manifold bolts.
Tighten

Tighten the bolts to 30 N.m (22 lb ft).

Fig 3: Installing Exhaust Manifold & Plug Wire Shields - Right (4.3L)
Courtesy of GENERAL MOTORS CORP.
Install the spark plugs.
Position the spark plug wire retainer to the engine.
Loosely install the spark plug wire retainer bolt.
Connect the spark plug wires to the spark plugs.
Install the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT in Engine Mechanical - 4.3L.
Tighten

Tighten the bolt to 12 N.m (106 lb in).

Fig 4: Installing Spark Plugs - Right (4.3L)
Courtesy of GENERAL MOTORS CORP.
Align the hinge clip with the lip on the throttle body.
In order to install the air cleaner outlet duct, pivot the air cleaner outlet duct downward until the mounting stud is through the hole.

Fig 5: Installing Air Cleaner Outlet Duct (4.3L)
Courtesy of GENERAL MOTORS CORP.
Install the air cleaner adapter nut.

Fig 6: Installing Air Cleaner Adapter Nut (4.3L)
Courtesy of GENERAL MOTORS CORP.
Install the PCV hose.

Fig 7: Installing PCV Hose (4.3L)
Courtesy of GENERAL MOTORS CORP.
Tighten the air cleaner outlet duct clamp at the MAF/IAT sensor.
Raise the vehicle.

Fig 8: Tightening Air Cleaner Outlet Duct Clamp (4.3L)
Courtesy of GENERAL MOTORS CORP.
Install the right exhaust manifold pipe nuts.
Tighten

Tighten the nuts to 50 N.m (37 lb ft).
Lower the vehicle.

Fig 9: Installing Exhaust Manifold Pipe Nuts - Right (4.3L)
Courtesy of GENERAL MOTORS CORP.