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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 368 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - RIGHT (3.1 L)INSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the heated oxygen sensor (HO2S). Refer to HEATED OXYGEN SENSOR
    Fig 1: Heated Oxygen Sensor (HO2S)
    G01766060Courtesy of GENERAL MOTORS CORP.
  2. Install the exhaust manifold gasket.
  3. Install the exhaust manifold.
  4. Install the exhaust manifold nuts.

    Tighten 

    Tighten the nuts to 16 N.m (12 lb ft).

    Fig 2: Exhaust Manifold Components
    G01766061Courtesy of GENERAL MOTORS CORP.
  5. Install the exhaust manifold lower heat shield.
  6. Install the exhaust manifold lower heat shield bolts.

    Tighten 

    Tighten the bolts to 10 N.m (89 lb in).

    Fig 3: Exhaust Manifold Lower Heat Shield And Bolts
    G01766062Courtesy of GENERAL MOTORS CORP.
  7. Install the exhaust manifold upper heat shield.
  8. Install the exhaust manifold upper heat shield bolts.

    Tighten 

    Tighten the bolts to 10 N.m (89 lb in).

    Fig 4: Exhaust Manifold Upper Heat Shield And Bolts
    G01766063Courtesy of GENERAL MOTORS CORP.
  9. Install the exhaust gas recirculation (EGR) tube to the right exhaust manifold. Refer to EGR VALVE PIPE
  10. Install the 3-way catalytic converter pipe to the right exhaust manifold. Refer to Catalytic Converter Replacement (3.1 L)  or Catalytic Converter Replacement (3.8L) 
  11. Lower the vehicle.
  12. Connect the heated oxygen sensor (HO2S) wiring harness connector.
  13. Install the exhaust crossover pipe nuts to the right exhaust manifold. Refer to Exhaust Crossover Pipe Replacement (3.1L)  or Exhaust Crossover Pipe Replacement (3.8L)  .
  14. Install the exhaust crossover pipe heat shield. Refer to Exhaust Crossover Pipe Replacement (3.1L)  or Exhaust Crossover Pipe Replacement (3.8L) 
  15. Install the air cleaner intake duct.
  16. Connect the negative battery cable.
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.