Crankcase Ventilation (CV) System Inspection
WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
- Test for vacuum at the positive crankcase ventilation (PCV) dirty air hose (2) where it connects to the vacuum orifice tube (5) in the camshaft cover. There should be manifold vacuum present at the hose (2). If there is no vacuum, inspect for a plugged hose, leaking hose or a plugged intake manifold passage.
- If oil has accumulated in the air cleaner resonator (1), inspect for the following conditions:
- Plugged vacuum orifice tube (5) in the camshaft cover
- Plugged, restricted, or leaking PCV dirty air hose (2)
- Plugged or restricted intake manifold passage (3)
- Excessive crankcase pressure or blow-by, refer to Engine Compression Test
- Additional items to inspect:
- Plugged or restricted vacuum tube (4) in the camshaft cover
- Plugged or restricted PCV fresh air hose (6)
- Plugged or restricted passage in the air cleaner resonator (1)
- Inspect the cam cover, the oil pan, engine front cover, and other sealing areas for leaks