How to Change the Tribute PCV Valveby Richard Rowe
The Mazda Tribute is essentially a re-badged Ford Escape, built right alongside the Escape and its Mercury Mariner twin in Ford's Claycomo, Missouri plant. The Tribute comes with one of three Duratec engines: the 2.5- and 2.3-liter inline four-cylinder or the 3.0-liter V6. All three are equipped with positive crankcase ventilation (PCV) systems that use the engine's intake vacuum to create negative pressure inside the engine block. These systems use a valve in the valve cover that allows the engine to pull air out of the crankcase without pulling oil out with it.
Pop the hood and disconnect your Tribute's negative battery cable. This will help keep you from accidentally shorting something with a mis-placed tool.
Locate the positive PCV hose. It's the very thick rubber hose coming out of the engine's plastic intake tube. It connects to the bottom-side of the intake tube and snakes down into the engine. It connects to the PCV valve on the valve cover. The PCV valve is easy to find on four-cylinder models, but you'll need to look beneath the intake manifold on V6-equipped versions.
Disconnect the PCV valve electrical connector; you may need to pop the tab loose with a flat head screwdriver.
Turn the PCV valve one-quarter turn counterclockwise and pull it free. You may find it easier to turn the PCV valve on V6-equipped models with a socket and extension, then pull it out with a pair of needle-nose pliers.
Install the new PCV valve by slipping it into place then turning it a quarter-turn clockwise. Reconnect the electrical connection and plug the PCV hose back in. Reconnect the negative battery cable and start the engine to test the installation. The Tribute will show a "Check Engine" light if you've done anything wrong.