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 CROSSOVER PIPE REPLACEMENTREMOVAL PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal 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.

Disconnect the battery ground (negative) cable.
Remove the throttle body air inlet duct.
Drain the coolant from the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
Remove the inlet radiator hose from the engine. Refer to RADIATOR HOSE REPLACEMENT - INLET .
Remove the thermostat bypass pipe. Refer to THERMOSTAT BYPASS PIPES REPLACEMENT .
Remove the exhaust crossover heat shield bolts.
Remove the exhaust crossover heat shield.

Fig 1: Removing Exhaust Crossover Heat Shield
Courtesy of GENERAL MOTORS CORP.
Remove the exhaust crossover pipe studs/nuts.
Remove the exhaust crossover pipe.

Fig 2: Removing Exhaust Crossover Pipe
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.