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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 633 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - RIGHTREMOVAL 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. Remove the fuel rail cover.
  2. Raise and suitably support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
    Fig 1: Fuel Rail Cover
    G01971194Courtesy of GENERAL MOTORS CORP.
  3. Remove the exhaust manifold nuts. (left side shown, right side similar)
    Fig 2: Exhaust Manifold Nuts
    G01971195Courtesy of GENERAL MOTORS CORP.
  4. Remove the connector position assurance (CPA) lock.
  5. Disconnect the oxygen sensor electrical connector.
    NOTE: Refer to OXYGEN SENSOR NOTICE in Cautions and Notices.
  6. Remove the oxygen sensor.
  7. Lower the vehicle.
    Fig 3: Disconnecting Oxygen Sensor Electrical Connector
    G01971196Courtesy of GENERAL MOTORS CORP.
  8. Remove the hose clamp at the right check valve.
  9. Remove the secondary air injection (AIR) pipe hose (1) from the right check valve.
    Fig 4: Removing Hose Clamp At Left & Right Check Valve
    G01971197Courtesy of GENERAL MOTORS CORP.
  10. Loosen, DO NOT remove the AIR pipe bolt at the rear of the left cylinder head.
    Fig 5: Loosening Air Pipe Bolts
    G01971198Courtesy of GENERAL MOTORS CORP.

    Important:  Do not remove the check valve from the AIR pipe unless valve service is required.

  11. Remove the AIR pipe bolts.
  12. Reposition the AIR pipe.
  13. Remove the old AIR pipe gasket. Discard the gasket
  14. Remove the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT in Engine Mechanical - 5.7 L.
    Fig 6: AIR Pipe Bolts
    G01971199Courtesy of GENERAL MOTORS CORP.
  15. Remove the ignition coil bracket studs.
  16. Remove the ignition coil bracket.
  17. Remove the spark plugs. Refer to SPARK PLUGS in Engine Controls - 5.7 L.
    Fig 7: Ignition Coil Bracket Studs
    G01971200Courtesy of GENERAL MOTORS CORP.
  18. Remove the exhaust manifold bolts.
  19. Remove the exhaust manifold, and old gasket. Discard the gasket.
  20. If necessary, remove the exhaust manifold heat shield bolts and shield.
    Fig 8: Exhaust Manifold Bolts
    G01971201Courtesy 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.