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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 574 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - LEFT (LA1)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 & Exhaust Manifold Gasket - Left
    GM54301Courtesy of GENERAL MOTORS CORP.
  1. Install the exhaust manifold gasket.
  2. Install the exhaust manifold.
    3. NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Install the exhaust manifold nuts.

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

    4. Fig 2: View Of Exhaust Manifold Heat Shield & Bolts - Left
    GM60831Courtesy of GENERAL MOTORS CORP.
  4. Install the exhaust manifold heat shield.
  5. Install the exhaust manifold heat shield bolts.

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

  6. Install the exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement (LA1)  or Exhaust Crossover Pipe Replacement (LY7) .
  7. Install the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.
  8. Connect the inlet radiator hose to the engine. Refer to Radiator Hose Replacement - Inlet (LA1) or Radiator Hose Replacement - Inlet (LY7) in Engine Cooling.
  9. Install the right engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement - Right in Engine Mechanical - 3.4 L.
  10. Fill the cooling system with engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
  11. Install the throttle body air inlet duct. Refer to Air Cleaner Intake Duct Replacement in Engine Controls - 3.4L.
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.