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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 802 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - LEFT (3.8L)REMOVAL 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 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Battery.
  2. Remove the fuel injector sight shield. Refer to FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L36) or FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L67) in Engine Mechanical - 3.8L.
  3. Remove the engine mount struts. Refer to ENGINE MOUNT STRUT REPLACEMENT - RIGHT and ENGINE MOUNT STRUT REPLACEMENT - LEFT in Engine Mechanical - 3.8L.
  4. Remove the lower right engine mount strut bracket. Refer to ENGINE MOUNT STRUT BRACKET REPLACEMENT - RIGHT LOWER in Engine Mechanical - 3.8L.
  5. Remove the exhaust crossover pipe bolts from the left exhaust manifold.
    Fig 1: Removing Exhaust Crossover Pipe Bolts
    G01969136Courtesy of GENERAL MOTORS CORP.
  6. Remove the left spark plugs from cylinders 1, 3 and 5. Refer to SPARK PLUGS in Self-Diagnostics - 3.8L.
  7. Remove the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT in Engine Mechanical - 3.8L.
  8. Remove the left engine lift bracket bolt and the nut.
    Fig 2: Removing Left Engine Lift Bracket, Nut & Bolt
    G01969137Courtesy of GENERAL MOTORS CORP.
  9. Remove the left engine lift bracket
  10. Remove the exhaust manifold heat shield nuts.
    Fig 3: Removing Exhaust Manifold Heat Shield & Nuts
    G01969138Courtesy of GENERAL MOTORS CORP.
  11. Remove the exhaust manifold heat shield.
  12. Remove the exhaust manifold bolts and the nuts.
    Fig 4: Removing Exhaust Manifold, Gasket, Bolts & Nuts
    G01969139Courtesy of GENERAL MOTORS CORP.
  13. Remove the exhaust manifold.
  14. Remove the exhaust manifold gasket.
  15. Clean and inspect the left exhaust manifold. Refer to EXHAUST MANIFOLD CLEANING AND INSPECTION in Engine Mechanical - 3.8L.
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.