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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 574 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST CROSSOVER PIPE REPLACEMENT (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: Identifying Exhaust Crossover Pipe Studs/Nuts
    GM54282Courtesy of GENERAL MOTORS CORP.
  1. Install the exhaust crossover pipe.
    2. NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the exhaust crossover pipe studs/nuts.

    Tighten:  Tighten the exhaust crossover pipe studs/nuts to 25 N.m (18 lb ft).

    3. Fig 2: Locating Exhaust Crossover Heat Shield & Bolts
    GM54366Courtesy of GENERAL MOTORS CORP.
  3. Install the exhaust crossover heat shield.
  4. Install the exhaust crossover heat shield bolts.

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

  5. Install the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.
  6. Install the inlet radiator hose to the engine. Refer to Radiator Hose Replacement - Inlet (LA1) or Radiator Hose Replacement - Inlet (LY7) in Engine Cooling.
  7. Fill the cooling system with engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
  8. Install the throttle body air inlet duct.
  9. Connect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (LA1) or Battery Negative Cable Disconnect/Connect Procedure (LY7) in Engine Electrical.
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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.