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HOMESERVICE MANUALSGMC2011SAVANA SPECIAL 4.8 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 83 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSTHREE-WAY CATALYTIC CONVERTER REPLACEMENTINSTALLATION PROCEDURE
2011 GMC Savana Special 4.8 A

Installation Procedure

2011 GMC Savana Special 4.8 ASECTION Installation Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 GMC Savana Special, 2010 GMC Savana Camper Special, 2010 GMC Savana, 2010 Chevrolet RV Cutaway, and 2010 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: A special anti-seize compound is used on the heated oxygen sensor (HO2S) threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an engine and if for any reason the sensors are to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.
  1. If reusing the old HO2S sensors, coat the threads with anti-seize compound GM P/N 5613695.
    2. Fig 1: View Of HO2S Electrical Connector
    GM313264Courtesy of GENERAL MOTORS CORP.
  2. Install the oxygen sensors to the catalytic converter. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
  3. Install NEW seals to the exhaust manifolds.
  4. Position the catalytic converter to the exhaust manifolds and the muffler.
  5. Install the catalytic converter to muffler nuts, but do not completely tighten.
    6. Fig 2: Identifying Catalytic Converter To Exhaust Manifold Nuts
    GM1954887Courtesy 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.