During the combustion process, unburned gasses can slip past the piston rings and enter the crankcase where the oil is stored. Over time these gases will cause the oil to gunk up and hamper the engine's lubrication system. To prevent this, the gasses must be removed and sent through the combustion process again. A positive crankcase ventilation valve only allows the gasses to vent into the intake system at low engine speeds. The 2004 Ford Taurus base model came with a two-valve per cylinder, 3.0-liter V-6, and higher trim levels came with a four-valve version of the engine. Both engines have a PCV valve, but the location of the valve is different depending on which engine you have.
Items you will need
- Fresh engine oil
Open the hood and find the PCV valve. On the two-valve engine the PCV valve is on the passenger side of the engine and protrudes from the top of the valve cover, pointing toward the hood. On the four-valve engine the PCV valve is on the same side of the engine, but protrudes from the camshaft cover on the side of the front valve cover, pointing toward the passenger-side fender.
Squeeze the pressure clamp with a pair of pliers and slide the clamp up the vacuum hose. Pull the vacuum hose from the PCV valve. Twist the PCV valve counterclockwise to unlock it, then pull the valve out of the valve cover or camshaft cover.
Coat the O-ring on a new PCV valve with fresh engine oil. Install the PCV valve to the engine and rotate it clockwise to the locked position. Push the vacuum hose onto the valve and slide the pressure clamp down the hose to secure the hose to the valve.
- Prodemand.com: 2004 Ford Taurus; Components; PCV Valve; Removal and Installation (2V and 4V)