The PCV valve is an important part of the crankcase ventilation system. The PCV or Positive Crankcase Valve is a one-way passage for the exhaust gasses coming from the crankcase of the motor. The PCV valve can get clogged or stuck over time and cause a variety of symptoms like oil seal or gasket failure, engine oil leaks, increase in engine internal pressure, black smoke coming from the exhaust, engine surges, and performance issues. Since the system is designed to recycle the gasses and is part of the engine emissions control system, your vehicle might not pass emissions testing if the PCV valve is dirty, broken, or malfunctioning. Sam’s Motorsports is the place to find high-quality replacement PCV valves for any kind of domestic or import vehicle.