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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 368 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST SEAL REPLACEMENT (3.1 L)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 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the exhaust manifold pipe gasket.
    Fig 1: Exhaust Manifold Pipe Gasket
    G01766090Courtesy of GENERAL MOTORS CORP.
  2. Return the exhaust system to the proper position.
  3. Connect any hangers.
  4. Remove the exhaust system support.
  5. Install the exhaust manifold pipe nuts to the exhaust manifold pipe studs.

    Tighten 

    Tighten the exhaust manifold stud nuts to 35 N.m (26 lb ft).

  6. Inspect the exhaust system for leaks and underbody contact.
  7. Lower the vehicle.
    Fig 2: Exhaust Manifold Pipe
    G01766091Courtesy of GENERAL MOTORS CORP.
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.