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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 717 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - LEFT (3.1L)REMOVAL 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 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE .
Remove the air cleaner intake duct. Refer to AIR CLEANER INTAKE DUCT .
Remove the right engine mount strut bracket. Refer to ENGINE MOUNT STRUT BRACKET REPLACEMENT - RIGHT .
Remove the exhaust crossover pipe heat shield bolts.
Remove the exhaust crossover pipe heat shield.

Fig 1: Exhaust Crossover Pipe Heat Shield & Bolts
Courtesy of GENERAL MOTORS CORP.
Remove the exhaust crossover pipe nuts from the left exhaust manifold.

Fig 2: Exhaust Crossover Pipe Nuts
Courtesy of GENERAL MOTORS CORP.
Remove the left exhaust manifold heat shield bolts.
Remove the left exhaust manifold heat shield.

Fig 3: Left Exhaust Manifold Heat Shield & Bolts
Courtesy of GENERAL MOTORS CORP.
Remove the left exhaust manifold nuts.
Remove the left exhaust manifold.
Remove the left exhaust manifold gasket.
Clean the left exhaust manifold to the left cylinder head sealing surfaces.

Fig 4: Left Exhaust Manifold, Gasket & Nuts
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.