A top sign of a bad Mini Cooper PCV valve is rough idle. Your engine may shake, stall, or run shaky at a stop. The valve might stick open or closed. This throws off air flow and pressure balance.
You often see excessive oil consumption with a faulty PCV valve. Oil burns quick, oil levels drop, and top-ups happen a lot. Check for oil leaking near the valve cover. Mini Coopers face this when PCV fails.
A bad PCV valve can light up check engine lights. Codes pop for lean or rich fuel mixes, misfires, or ventilation faults. You feel poor acceleration or lag as air-fuel balance slips.
Swap the PCV valve or full valve cover on Mini Coopers for a fix. Many have PCV built in. Fresh oil changes and checks stop clogs and boost system life.
