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 717 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - LEFT (3.8L)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.

Remove the fuel injector sight shield. Refer to FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L36) or FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L67) .
Remove the left and the right engine mount struts. Refer to ENGINE MOUNT STRUT REPLACEMENT - LEFT and ENGINE MOUNT STRUT REPLACEMENT - RIGHT .
Remove the exhaust crossover pipe from the left exhaust manifold. Refer to Exhaust Crossover Pipe Replacement (3.1L) or Exhaust Crossover Pipe Replacement (3.8L) .
Remove the left spark plug wires from the left spark plugs. Refer to
Remove the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT .
Remove the left engine lift bracket bolt, nut and the engine lift bracket from the left exhaust manifold.

Fig 1: Left Engine Lift Bracket, Bolt & Nut

Courtesy of GENERAL MOTORS CORP.

Remove the left exhaust manifold heat shield nuts.
Remove the left exhaust manifold heat shield.

Fig 2: Left Exhaust Manifold Heat Shield & Nuts
Courtesy of GENERAL MOTORS CORP.
Remove the left exhaust manifold retaining bolts, nuts and studs from the left exhaust manifold.
Remove the left exhaust manifold.
Remove the left exhaust manifold gasket.

Fig 3: Left Exhaust Manifold, Gasket, Bolts, Nuts & Studs
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.