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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 574 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - RIGHT (LY7)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 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Exhaust Manifold Heat Shield Bolts And The Heat Shield
    GM1395455Courtesy of GENERAL MOTORS CORP.
  1. Install the exhaust manifold heat shield to the exhaust manifold as necessary.
    2. NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the exhaust manifold heat shield bolts.

    Tighten:  Tighten the exhaust manifold heat shield bolts to 10 N.m (89 lb in).

    3. Fig 2: Identifying Exhaust Manifold Bolts
    GM1404032Courtesy of GENERAL MOTORS CORP.
  3. Install the NEW exhaust manifold gasket.
  4. Install the exhaust manifold.
  5. Install the exhaust manifold bolts.

    Tighten:  Tighten the exhaust manifold bolts to 20 N.m (15 lb ft).

    6. Fig 3: Locating Exhaust Crossover Pipe To Left Bank Exhaust Manifold Nuts
    GM1395470Courtesy of GENERAL MOTORS CORP.
  6. Install the exhaust crossover pipe to right bank exhaust manifold nuts (3). Refer to Exhaust Crossover Pipe Replacement (LA1)  or Exhaust Crossover Pipe Replacement (LY7) .
  7. Raise the powertrain and/or lower the vehicle until the frame insulators contact the chassis.
  8. Install the two frame left side bolts. Refer to Frame Replacement - Front (W/AWD) or Frame Replacement - Front (W/FWD) in Frame and Underbody.
  9. Install the left front wheel liner. Refer to Front Fender Liner Replacement in Body Front End.
  10. Remove the utility stand.
  11. Install the catalytic converter. Refer to Catalytic Converter Replacement .
  12. Connect the intermediate steering shaft to the steering gear. Refer to Intermediate Steering Shaft Replacement in Steering Wheel and Column.
  13. Lower the vehicle.
  14. Connect the torque struts to the engine. Refer to and in Engine Mechanical - 3.6L (LY7).
  15. Install the master cylinder fluid level sensor. Refer to Master Cylinder Fluid Level Sensor Replacement in Hydraulic Brakes.
  16. Install the air inlet duct. Refer to Air Cleaner Intake Duct Replacement in Engine Controls - 3.6L (LY7).
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.