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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 633 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST SEAL REPLACEMENTREMOVAL PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and suitably support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  2. Support the front of the catalytic converter with an adjustable jack stand.
  3. Remove the exhaust pipe brace lower bolts.
    Fig 1: Exhaust Pipe Brace Lower Bolts
    G01971210Courtesy of GENERAL MOTORS CORP.
  4. Remove the exhaust pipe hanger lower bolts.
    Fig 2: Exhaust Pipe Hanger Lower Bolts
    G01971211Courtesy of GENERAL MOTORS CORP.
  5. Remove the left and right exhaust manifold nuts.
  6. Lower the front of the catalytic converter.
  7. Remove the exhaust seal.
    Fig 3: Left & Right Exhaust Manifold Nuts
    G01971212Courtesy 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.