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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Mechanical - 4.6L (1 Of 5)) >> Diagnostic Information and Procedures >> Crankcase Ventilation System Inspection/Diagnosis

Crankcase Ventilation System Inspection/Diagnosis

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Crankcase Ventilation System Inspection/Diagnosis

Concern Action
External oil leak Inspect for any of the following conditions:
  • Plugged positive crankcase ventilation (PCV) orifice tube.
  • Plugged or kinked PCV hoses.
  • Damaged or incorrectly installed PCV hoses.
  • Excessive crankcase pressure.
Rough Idle Inspect for any of the following conditions:
  • Plugged PCV orifice tube.
  • Plugged or kinked PCV hoses.
  • Leaking or damaged PCV hoses.
Stalling or slow idle speed Inspect for any of the following conditions:
  • Plugged PCV orifice tube.
  • Plugged or kinked PCV hoses.
  • Leaking or damaged PCV hoses.
High idle speed Inspect for a leaking or damaged PCV hoses.
Sludge in the engine Inspect for any of the following conditions:
  • Plugged PCV orifice tube.
  • Plugged or kinked PCV hoses.
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