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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 717 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - RIGHT (3.1L)REMOVAL 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 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE .
  2. Remove the air cleaner intake duct. Refer to AIR CLEANER INTAKE DUCT .
  3. Remove the accelerator and cruise control cables with the bracket from the throttle body. Refer to
  4. Rotate the engine for service access. Refer to ROTATING THE ENGINE FOR SERVICE ACCESS .
  5. Remove the manifold absolute pressure (MAP) sensor. Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR .
  6. Remove the ignition control module and the ignition control module bracket. Refer to IGNITION CONTROL MODULE .
  7. Disconnect the heated oxygen (HO2S) sensor electrical connector.
    Fig 1: Heated Oxygen (HO2S) Sensor Electrical Connector
    G01704043Courtesy of GENERAL MOTORS CORP.
  8. Remove the exhaust crossover pipe heat shield bolts.
  9. Remove the exhaust crossover pipe heat shield.
    Fig 2: Exhaust Crossover Pipe Heat Shield & Bolts
    G01704044Courtesy of GENERAL MOTORS CORP.
  10. Remove the exhaust crossover pipe nuts from the right exhaust manifold.
  11. Raise and support the vehicle. Refer to LIFTING & JACKING THE VEHICLE .
  12. Remove the catalytic converter. Refer to Catalytic Converter Replacement (3.1L)  or Catalytic Converter Replacement (3.8L) .
    Fig 3: Exhaust Crossover Pipe & Nuts
    G01704045Courtesy of GENERAL MOTORS CORP.
  13. Remove the exhaust gas recirculation (EGR) tube from the right exhaust manifold. Refer to EGR VALVE PIPE .
    Fig 4: Exhaust Gas Recirculation (EGR) Tube
    G01704046Courtesy of GENERAL MOTORS CORP.
  14. Remove the right exhaust manifold upper heat shield bolts.
  15. Remove the right exhaust manifold upper heat shield.
    Fig 5: Right Exhaust Manifold Upper Heat Shield & Bolts
    G01704047Courtesy of GENERAL MOTORS CORP.
  16. Remove the right exhaust manifold lower heat shield bolts.
  17. Remove the right exhaust manifold lower heat shield.
    Fig 6: Right Exhaust Manifold Lower Heat Shield & Bolts
    G01704048Courtesy of GENERAL MOTORS CORP.
  18. Remove the right exhaust manifold nuts.
  19. Remove the right exhaust manifold.
  20. Remove the right exhaust manifold gasket.
  21. Clean and inspect the right exhaust manifold mating surfaces.
    Fig 7: Right Exhaust Manifold, Gasket & Nuts
    G01704049Courtesy of GENERAL MOTORS CORP.
  22. If replacing the right exhaust manifold remove the heated oxygen (HO2S) sensor. Refer to HEATED OXYGEN SENSOR .
    Fig 8: Heated Oxygen (HO2S) Sensor
    G01704050Courtesy 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.