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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 875 (ENGINE EXHAUST)REPAIR INSTRUCTIONSEXHAUST MANIFOLD 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 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Outlet Resonator/Duct Assembly
    GM898897Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the intake air temperature (IAT) sensor connector.
  2. Loosen the clap at the air cleaner assembly.
  3. Remove the push-pin attachment from the outlet resonator/duct assembly to support the bracket.
  4. Loosen the clamp at the throttle body assembly.
  5. Disconnect the PCV fresh air vent hose at the cam cover.
  6. Remove the outlet resonator/duct assembly.
    7. Fig 2: Exhaust Heat Shield Bolts (2.2L)
    GM951386Courtesy of GENERAL MOTORS CORP.
  7. Remove the exhaust manifold heat shield bolts.
  8. Remove the exhaust manifold heat shield.
  9. Disconnect the front and rear O2 sensor connectors. Remove the sensor if the exhaust manifold is being replaced using J 39194-C  .
  10. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
    11. Fig 3: Exhaust Manifold Gasket
    GM898154Courtesy of GENERAL MOTORS CORP.
  11. Remove the exhaust manifold pipe to manifold nuts.
  12. Remove the exhaust manifold pipe to resonator pipe nuts behind the converter.
  13. Disconnect the rear O2 sensor wire from the heat shield.
  14. Separate the exhaust manifold pipe and resonator pipe. Discard the gaskets.
    15. Fig 4: View Of Exhaust Manifold & Gasket
    GM746061Courtesy of GENERAL MOTORS CORP.
  15. Remove the exhaust manifold nuts.
  16. Remove the exhaust manifold assembly and discard the gasket.
    17. Fig 5: Manifold Gasket
    GM949143Courtesy of GENERAL MOTORS CORP.
  17. Remove the exhaust manifold gasket and discard.
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.