Installation Procedure
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Install a NEW exhaust manifold gasket.
- Install the exhaust manifold.
- Install the exhaust manifold bolt and nuts.NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten
- Tighten the bolt to 35 N.m (26 lb ft).
- Tighten the nuts to 16 N.m (12 lb ft).
- Raise the vehicle.
- Install the exhaust manifold heat shield.
- Install the exhaust manifold heat shield bolts and nuts.
Tighten
Tighten the bolts and nuts to 25 N.m (18 lb ft).
- Lower the vehicle.
- Install the spark plugs. Refer to SPARK PLUGS
in Engine Controls -8.1L
Important: Fully install the spark plug wire by pushing on the exposed end of the spark plug boot. Do not push the spark plug wire on to the spark plug by using the metal heat shield.
- Install the spark plug wires to the spark plugs and ignition coils.
- Install the wheelhouse panel. Refer to WHEELHOUSE PANEL REPLACEMENT in Body Front End.