SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 468 (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 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect negative battery cable.
  2. Remove the throttle body air inlet duct.
  3. Remove the accelerator cable bracket from the throttle body.
  4. Remove the manifold air pressure (MAP) sensor.
  5. Remove the exhaust gas recirculation (EGR) valve.
    Fig 1: Removing Right Upper And Lower Exhaust Manifold Heat Shields
    G01501617Courtesy of GENERAL MOTORS CORP.
  6. Rotate the engine for service access. Refer to ROTATING THE ENGINE FOR SERVICE ACCESS .
  7. Remove the ignition module and the ignition coils with the bracket.
  8. Remove the spark plug wires from the engine right bank spark plugs.
  9. Disconnect the oxygen sensor electrical connector.
  10. Remove the evaporative emissions (EVAP) solenoid bracket.
  11. Remove the exhaust crossover pipe. Refer to EXHAUST CROSSOVER PIPE REPLACEMENT  .
  12. Raise and support the vehicle.
  13. Remove the catalytic converter. Refer to CATALYTIC CONVERTER REPLACEMENT  .
  14. Remove the exhaust manifold heat shield bolts.
  15. Remove the exhaust manifold heat shields.
  16. Remove the exhaust manifold nuts.
  17. Remove the exhaust manifold.
  18. Remove the exhaust manifold gasket.
  19. Lower the vehicle.
  20. Clean the engine right side exhaust manifold sealing surfaces and the cylinder head sealing surfaces. Refer to EXHAUST MANIFOLD CLEANING AND INSPECTION .
  21. If you are REPLACING the engine right side exhaust manifold, remove the exhaust gas recirculation (EGR) valve pipe.
  22. If you are REPLACING the engine right side exhaust manifold, remove the Heated Oxygen Sensor (HO2S).
    Fig 2: Removing Right Exhaust Manifold And Gasket
    G01501618Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.