Checking PCV Valve Function
WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1990 Pontiac Sunbird, 1990 Pontiac Grand Prix, 1990 Pontiac Grand Am, 1990 Pontiac Firebird, and 1990 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
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.