LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 252 (Engine Controls - System & Component Tests - 2.2L) >> Emission Systems & Sub-Systems >> Positive Crankcase Ventilation >> Inspection/Diagnosis

Positive Crankcase Ventilation: Inspection/Diagnosis

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the PCV hose.
  2. Start the engine.
  3. Check for vacuum at the hose. If there is no vacuum, check for a plugged hose or manifold port. Check for a hose that collapses when blocked (vacuum applied). Replace the plugged or the deteriorated hoses.
  4. Allow the engine to idle at normal operating temperature.
  5. Remove the engine oil dipstick and install a vacuum gauge on the dipstick tube.
  6. Block off the PCV system fresh air intake passage.
  7. Run the engine at 1500 RPM for 30 seconds, then read vacuum gauge while engine is running at 1500 RPM.
    • If vacuum is present, this indicates that the crankcase ventilation system is functioning properly.
    • If no vacuum is indicated, the engine may not be sealed and is drawing in outside air. Check the valve covers, the oil pan gasket or other sealing areas for leaks. See appropriate article in ENGINES.
    • If the vacuum gauge registers a pressure, or if a vacuum gauge is pushed out of dipstick tube, check for a plugged PCV port, a plugged hose or an excessive engine blow-by.
scientia non olet · About LEMON Manuals