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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 468 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - LEFTINSTALLATION PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Install the exhaust manifold gasket.
Install the exhaust manifold.
Install the exhaust manifold nuts.
Tighten

Tighten the exhaust manifold nuts to 16 N.m (12 lb ft).

Fig 1: Installing Left Exhaust Manifold And Gasket
Courtesy of GENERAL MOTORS CORP.
Install the exhaust manifold heat shield.
Install the exhaust manifold heat shield bolts.
Tighten

Tighten the exhaust manifold heat shield bolts to 10 N.m (89 Ib. in).
Install the exhaust crossover pipe. Refer to EXHAUST CROSSOVER PIPE REPLACEMENT .
Install the thermostat bypass pipe. Refer to THERMOSTAT BYPASS PIPES REPLACEMENT .
Connect the inlet radiator hose to the engine. Refer to RADIATOR HOSE REPLACEMENT - INLET .
Install the right engine mount strut bracket. Refer to ENGINE MOUNT STRUT BRACKET REPLACEMENT - RIGHT .
Fill the cooling system with engine coolant. Refer to DRAINING AND FILLING COOLING SYSTEM .
Install the throttle body air inlet duct.

Fig 2: Installing Left Exhaust Manifold Heat Shield
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

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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.