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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISENGINE MECHANICALENGINE EXHAUST SYSTEMREPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - RIGHT SIDE (LS4)INSTALLATION PROCEDURE
2008 Pontiac Grand Prix Base

Installation Procedure

2008 Pontiac Grand Prix BaseSECTION Installation Procedure
IMPORTANT:
  • Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets my affect vehicle emissions and/or On Board Diagnostic (OBD) II system performance.
  • The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.
  • DO NOT apply threadlock to the first three thread of the bolts.
    Fig 1: Exhaust Manifold
    GM1411888Courtesy of GENERAL MOTORS CORP.
  1. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the threads of the exhaust manifold bolts.
    2. NOTE: Refer to Fastener Notice .
  2. Install a NEW exhaust manifold gasket, the exhaust manifold and bolts.

    Tighten: 

    • Tighten the bolts a first pass to 15 N.m (11 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side to side, and work toward the outside.
    • Tighten the bolts a final pass to 20 N.m (15 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side to side, and work toward the outside.

  3. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the right cylinder head.
    4. Fig 2: Heat Shield & Bolts
    GM1411890Courtesy of GENERAL MOTORS CORP.
  4. Install the exhaust manifold heat shield (603).
  5. Install the exhaust manifold heat shield bolts (604).

    Tighten:  Tighten the bolts to 9 N.m (80 lb in).

  6. Install the O2 sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
  7. Raise the vehicle.
  8. Remove the mechanics wire from the exhaust system and connect the catalytic converter. Refer to Catalytic Converter Replacement (L26)  or Catalytic Converter Replacement (LS4) .
    9. Fig 3: Exhaust Crossover Pipe & Nuts
    GM1554543Courtesy of GENERAL MOTORS CORP.
  9. Install the exhaust crossover pipe nuts to the right exhaust manifold.

    Tighten:  Tighten the nuts to 25 N.m (18 lb ft).

  10. Install the ignition coil. Refer to Ignition Coil Replacement .
  11. Install the spark plugs. Refer to Spark Plug Replacement .
  12. Install the fuel injector sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
RENDER: 1.0x

NO RELATED

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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.