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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 249 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT (4.2L ENGINE)INSTALLATION PROCEDURE
2006 Isuzu Ascender S, 5.3 M, 4WD

Installation Procedure

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2007 Isuzu Ascender, 2007 GMC Envoy, 2007 Chevrolet TrailBlazer, and 2007 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Exhaust Manifold Gasket
    GM637622Courtesy of GENERAL MOTORS CORP.
  1. Install a new exhaust manifold gasket.
    2. Fig 2: Identifying Exhaust Manifold Bolt Tightening Sequence
    GM715596Courtesy of GENERAL MOTORS CORP.
  2. Install the exhaust manifold.
    3. NOTE: Refer to Fastener Notice .
  3. With threadlock GM P/N 12345493 (Canadian P/N 10953488) on the manifold bolts, install the bolts onto the manifold.

    Tighten: 

    1. Tighten the exhaust manifold bolts first pass in sequence to 20 N.m (15 lb ft).
    2. Tighten the exhaust manifold bolts second pass in sequence to 20 N.m (15 lb ft).
    3. Tighten the exhaust manifold bolts final pass in sequence to 20 N.m (15 lb ft).

    4. Fig 3: View Of Exhaust Manifold Studs
    GM637627Courtesy of GENERAL MOTORS CORP.
  4. Install the exhaust manifold heat shield studs, if required.

    Tighten:  Tighten the heat shield studs to 10 N.m (89 lb in).

  5. Install the manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement .
  6. Raise the vehicle.
    7. Fig 4: View Of Exhaust Pipe To Manifold With Seal - 4.2L
    GM758044Courtesy of GENERAL MOTORS CORP.
  7. Install the exhaust pipe to the manifold with seal and secure the pipe with the nuts.

    Tighten:  Tighten the exhaust pipe nuts to 50 N.m (37 lb ft).

  8. Lower the vehicle.
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.