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Home >> Saturn >> 2010 >> Sky Red Line, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical - 2.4L - Repair Instructions - Off Vehicle (1 Of 2)) >> Exhaust Manifold Cleaning and Inspection (LE5, LE8, LE9)

Exhaust Manifold Cleaning and Inspection (LE5, LE8, LE9)

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying Oxygen Sensor
    GM2148505Courtesy of GENERAL MOTORS CORP.
    NOTE:
    • Do not reuse the exhaust manifold-to-cylinder head gaskets. Upon installation of the exhaust manifold, install a NEW gasket. An improperly installed gasket or leaking exhaust system may effect On-Board Diagnostics (OBD) II system performance.
    • Remove the oxygen sensor prior to cleaning the manifold. Do not submerge the oxygen sensor in cleaning solvent.
  1. Remove the oxygen sensor (1) from the manifold.
  2. Clean the exhaust manifold in solvent.
    3. WARNING: Refer to Safety Glasses Warning .
  3. Dry the exhaust manifold with compressed air.
  4. Inspect the heat shield for damage.
    5. Fig 2: Inspecting Exhaust Manifold For Flatness
    GM2146364Courtesy of GENERAL MOTORS CORP.
  5. Use a straight edge (2) and a feeler gauge (1) and measure the exhaust manifold mounting face for warpage.

    An exhaust manifold face with warpage in excess of 0.25 mm (0.0100 in) may cause an exhaust leak and may effect OBD II system performance. Exhaust manifolds not within specifications must be replaced.

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