LS 400 V8-4.0L (1UZ-FE) (1990)
Positive Crankcase Ventilation Valve: Testing and Inspection
PCV Testing
- Remove PCV valve.
- Blow air into valve from cylinder head side.
- Air should flow freely.
PCV Testing
- Blow air through manifold side of valve.
- Air should flow with high resistance.
- Replace valve if desired results are not achieved, or if there is visible damage.