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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 717 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - RIGHT (3.8L)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. Remove the fuel injector sight shield. Refer to FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L36) or FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L67) .
  2. Remove the exhaust crossover pipe from the right exhaust manifold. Refer to Exhaust Crossover Pipe Replacement (3.1L)  or Exhaust Crossover Pipe Replacement (3.8L) .
  3. Raise and support the vehicle. Refer to LIFTING & JACKING THE VEHICLE .
  4. Remove the exhaust manifold pipe stud nuts and the catalytic converter pipe from the right exhaust manifold.
    Fig 1: Exhaust Manifold Pipe Stud Nuts & Catalytic Converter Pipe
    G01704059Courtesy of GENERAL MOTORS CORP.
  5. Remove the EGR adapter pipe from the right exhaust manifold.
  6. Lower the vehicle.
  7. Rotate the engine to access the right side of the engine. Refer to ROTATING THE ENGINE FOR SERVICE ACCESS .
    Fig 2: EGR Adapter Pipe
    G01704060Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the heated oxygen (HO2S) sensor electrical connector (4).
  9. Remove the heated oxygen (HO2S) sensor electrical connector (4) from the engine sight shield bracket (1).
  10. Remove the right spark plug wires from the right spark plugs. Refer to
    Fig 3: Heated Oxygen (HO2S) Sensor Electrical Connector & Engine Sight Shield Bracket
    G01704061Courtesy of GENERAL MOTORS CORP.
  11. Remove the right engine lift bracket bolt and nut.
  12. Remove the right engine lift bracket.
    Fig 4: Right Engine Lift Bracket, Bolt & Nut
    G01704062Courtesy of GENERAL MOTORS CORP.
  13. Remove the fuel injector sight shield bracket nuts.
  14. Remove the fuel injector sight shield bracket.
    Fig 5: Fuel Injector Sight Shield Bracket & Nuts
    G01704063Courtesy of GENERAL MOTORS CORP.
  15. Remove the right exhaust manifold bolts and nuts.
  16. Remove the right exhaust manifold.
  17. Remove the right exhaust manifold gasket.
    Fig 6: Right Exhaust Manifold, Gasket, Bolts & Nuts
    G01704064Courtesy of GENERAL MOTORS CORP.
  18. Remove the upper right exhaust manifold heat shield.
    Fig 7: Upper Right Exhaust Manifold Heat Shield
    G01704065Courtesy of GENERAL MOTORS CORP.
  19. Remove the lower right exhaust manifold heat shield.
  20. If replacing the right exhaust manifold remove the heated oxygen (HO2S) sensor from the right exhaust manifold. Refer to HEATED OXYGEN SENSOR .
    Fig 8: Lower Right Exhaust Manifold Heat Shield
    G01704066Courtesy of GENERAL MOTORS CORP.
  21. Remove the exhaust manifold stud(s) if damaged.
  22. Clean and Inspect the right exhaust manifold mating surfaces
    Fig 9: Exhaust Manifold Studs
    G01704067Courtesy 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.