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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 687 (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 Pontiac Grand Prix. 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 Engine Electrical.
  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.
  6. Remove the left spark plugs from cylinders 1,3 and 5. Refer to SPARK PLUGS in Engine Controls - 3.8L.
  7. Remove the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT in Engine Mechanical - 3.8L.
    Fig 1: Removing Exhaust Crossover Pipe Bolts From Left Exhaust Manifold
    G02080651Courtesy of GENERAL MOTORS CORP.
  8. Remove the left engine lift bracket bolt and the nut.
  9. Remove the left engine lift bracket
    Fig 2: Removing Left Engine Lift Bracket
    G02080652Courtesy of GENERAL MOTORS CORP.
  10. Remove the exhaust manifold heat shield nuts.
  11. Remove the exhaust manifold heat shield.
    Fig 3: Removing Exhaust Manifold Heat Shield
    G02080653Courtesy of GENERAL MOTORS CORP.
  12. Remove the exhaust manifold bolts and the nuts.
  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.
    Fig 4: Removing Exhaust Manifold And Gasket
    G02080654Courtesy of GENERAL MOTORS CORP.
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.