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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 719 (ENGINE MECHANICAL - 3.8L (UNIT REPAIR))REPAIR INSTRUCTIONSEXHAUST MANIFOLD INSTALLATION - LEFT
1999 GMC Forward Control 5.7 R, Automatic

Exhaust Manifold Installation - Left

1999 GMC Forward Control 5.7 R, AutomaticSECTION Exhaust Manifold Installation - Left
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.
NOTE: Refer to FASTENER NOTICE .
  1. Install the exhaust manifold studs.

    Tighten 

    Tighten the exhaust manifold studs to 10 N.m (89 lb in).

    Fig 1: Exhaust Manifold Studs
    G01703720Courtesy of GENERAL MOTORS CORP.
  2. Install the exhaust manifold gasket.
  3. Install the exhaust manifold.
  4. Install the exhaust manifold bolts and nuts.

    Tighten 

    Tighten the exhaust manifold bolts and nuts to 30 N.m (22 Ib. ft).

  5. Install the left side spark plugs.

    Tighten 

    • Tighten the spark plugs to 27 N.m (20 Ib. ft) when installing the spark plugs in to a new cylinder head.
    • Tighten the spark plugs to 15 N.m (13 Ib. ft) when re-installing the spark plugs after initial installation.
      Fig 2: Exhaust Manifold, Gasket, Bolts & Nuts
      G01703721Courtesy of GENERAL MOTORS CORP.
  6. Install the left engine lift hook.
  7. Install the left engine lift hook nut and bolt.

    Tighten 

    Tighten the left engine lift hook nut and bolt to 30 N.m (22 Ib. ft).

    Fig 3: Left Engine Lift Hook, Nut & Bolt
    G01703722Courtesy of GENERAL MOTORS CORP.
  8. Install the left exhaust manifold heat shield.
  9. Install the left exhaust manifold heat shield nuts.

    Tighten 

    Tighten the left exhaust manifold heat shield nuts to 20 N.m (15 Ib. ft).

    Fig 4: Left Exhaust Manifold Heat Shield & Nuts
    G01703723Courtesy 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.