It might be more than two decades old, but the Ford Modular engine remains the subject of intense controversy in some circles. Replacing a much-loved V-8 like the Windsor is never a good way to ingratiate yourself to enthusiasts -- especially when you have to use your DOHC heads to rev higher in order to make up for a lack of displacement and torque. By 2004, though, bigger variants like the 5.4-liter had created a pretty strong following, especially after the introduction of variable camshaft timing and a set of excellent three-valve cylinder heads.
Items you will need
- Socket set
- Heated PCV fitting O-ring seal 9F695
- Torque wrench
Identify the PCV valve. Unlike traditional designs, which place the PCV valve in one valve cover, this one uses a large crossover tube and a single PCV valve in the middle to draw gases from both side of the engine. The PCV crossover tube and valve are almost the first things you see when you pop the hood, as they hover directly over the intake manifold. You can see another tube plugged into the top.
Unplug the wiring harness from the heated PCV valve. Make sure the mating area around the tube quick-disconnect is clear of debris by blowing it off with a blast of compressed air. Release the quick-disconnect fitting on the tube where it meets the PCV valve. Push the fitting toward the tube to relieve pressure, then push the release tab counterclockwise with your thumb. Pull the hose free of the valve.
Remove the two bolts that secure the PCV to the crossover tube, then pull the fitting off. Remove the O-ring if it got stuck in the tube. Install a new O-ring, and then install the new PCV valve fitting. Tighten the bolts to 53 inch-pounds with a torque wrench. Plug the wiring harness back in, and then reinstall the tube and quick-disconnect fitting.
- ProDemand; 2004 Ford Pickup 5.4L Eng F150; Service Manual; Engine -- 5.4L (3V) F150 Pickup; Positive Crankcase Ventilation Valve