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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 574 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST SEAL REPLACEMENTINSTALLATION 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 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Exhaust Manifold Pipe Gasket
    GM107855Courtesy of GENERAL MOTORS CORP.
  1. Install the catalytic converter seal.
    2. Fig 2: Identifying Catalytic Converter Nuts
    GM372621Courtesy of GENERAL MOTORS CORP.
  2. Install the catalytic converter to the exhaust manifold.
  3. Connect the catalytic converter to the catalytic converter hangers.
  4. Remove the utility stand.
    5. NOTE: Refer to Fastener Notice in Cautions and Notices.
  5. Install the catalytic converter nuts.

    Tighten:  Tighten the catalytic converter nuts to 34 N.m (25 lb ft).

  6. Install the oxygen sensor electrical connector.
  7. Lower the vehicle.
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.