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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 717 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - LEFT (3.1L)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 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the left exhaust manifold gasket.
  2. Install the left exhaust manifold.
    NOTE: Refer to FASTENER NOTICE .
  3. Install the left exhaust manifold nuts.

    Tighten 

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

    Fig 1: Left Exhaust Manifold, Gasket & Nuts
    G01704033Courtesy of GENERAL MOTORS CORP.
  4. Install the left exhaust manifold heat shield.
  5. Install the left exhaust manifold heat shield bolts.

    Tighten 

    Tighten the left exhaust manifold heat shield bolts to 10 N.m (89 lb in).

    Fig 2: Left Exhaust Manifold Heat Shield & Bolts
    G01704034Courtesy of GENERAL MOTORS CORP.
  6. Install the exhaust crossover pipe nuts to the left exhaust manifold.

    Tighten 

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

    Fig 3: Exhaust Crossover Pipe Nuts
    G01704035Courtesy of GENERAL MOTORS CORP.
  7. Install the exhaust crossover pipe heat shield.
  8. Install the exhaust crossover pipe heat shield bolts.

    Tighten 

    Tighten the exhaust crossover pipe heat shield bolts to 10 N.m (89 lb in).

    Fig 4: Exhaust Crossover Pipe Heat Shield & Bolts
    G01704036Courtesy of GENERAL MOTORS CORP.
  9. Install the right engine mount strut bracket. Refer to ENGINE MOUNT STRUT BRACKET REPLACEMENT - RIGHT .
  10. Install the air cleaner intake duct. Refer to AIR CLEANER INTAKE DUCT .
  11. Connect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE .
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.