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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 422 (Engine Controls - System & Component Testing - 3.8L) >> Emission Systems & Subsystems >> Positive Crankcase Ventilation >> Diagnosis

Positive Crankcase Ventilation: Diagnosis

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. External Oil Leak  - Check for plugged Positive Crankcase Ventilation (PCV) valve, plugged or kinked PCV hoses, damaged or incorrectly installed PCV valve or PCV valve "O" ring, hoses or excessive crankcase pressure.
  2. Rough Idle  - Check for plugged PCV valve, plugged or kinked PCV hoses, leaking or damaged PCV valve or hoses.
  3. Stalling Or Slow Idle Speed  - Check for plugged PCV valve, plugged or kinked PCV hoses, or leaking or damaged PCV valve or hoses.
  4. High Idle Speed  - Check for a leaking or damaged PCV valve or hoses.
  5. Sludge In The Engine  - Check for plugged PCV valve or plugged or kinked PCV hoses.
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