Checking PCV Valve Function

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The PCV system may require service for obstructions if any of

the following conditions exist:

Rough Idle
Stalling or Slow Idle Speed
Oil Leaks
Oil in Air Cleaner
Sludge in Engine

A PCV leaking valve or hose could cause:

Rough Idle
Stalling
High Idle speed

If engine idles roughly, check for clogged PCV valve, plugged or broken hoses BEFORE adjusting idle. Check correct PCV valve application to ensure the correct valve is fitted. Replace PCV valve if required.