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 802 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST CROSSOVER PIPE REPLACEMENT (3.1L)INSTALLATION 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 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

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

Tighten the nuts to 25 N.m (18 lb ft).

Fig 1: Installing Exhaust Crossover Pipe & Nuts
Courtesy of GENERAL MOTORS CORP.
Install the exhaust crossover heat shield.

Fig 2: Installing Exhaust Crossover Heat Shield & Bolts
Courtesy of GENERAL MOTORS CORP.
Install the exhaust crossover heat shield bolts.
Tighten

Tighten the bolts to 10 N.m (89 lb in).
Install the thermostat bypass pipe. Refer to THERMOSTAT BYPASS PIPES REPLACEMENT in Engine Cooling.
Install the air cleaner intake duct. Refer to AIR CLEANER INTAKE DUCT in Removal & Installation - A/T.

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.