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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 365 (ENGINE MECHANICAL - 3.8L (UNIT REPAIR))REPAIR INSTRUCTIONSINTAKE MANIFOLD INSTALLATION - LOWER (L36)
1999 GMC Forward Control 5.7 R, Automatic

Intake Manifold Installation - Lower (L36)

1999 GMC Forward Control 5.7 R, AutomaticSECTION Intake Manifold Installation - Lower (L36)
WARNING: This page is about a different car, the 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the lower intake manifold gasket.
  2. Install the lower intake manifold.
  3. Apply threadlocker 272 GM P/N United States 12345493, GM P/N Canada 10953488 or the equivalent to the bolt threads.
  4. Install the lower intake manifold bolts.

    Tighten: 

    Tighten the lower intake manifold bolts in sequence to 15 N.m (11 lb ft) 

    Fig 1: Lower Intake Manifold Bolt Tightening Sequence (L36)
    G01764671Courtesy of GENERAL MOTORS CORP.
  5. Install the EGR outlet pipe to the intake manifold.
  6. Install the EGR outlet pipe bolt.

    Tighten: 

    Tighten the EGR outlet pipe bolt to 29 N.m (21 lb ft) 

    Fig 2: EGR Outlet
    G01764672Courtesy 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.