The PCV valve is an regularly overlooked maintenance item that deserve to lead to some pretty serious engine related worries if left unchecked. Over time, the PCV valve can end up being contaminated through oil and also moisture the will cause the valve come stick in the opened or close up door position, hence limiting that is function. A timeless PCV valve will frequently last 75,000 miles, but with it being such an cheap part, numerous individuals opt to replace them at 30,000 mile intervals for piece of mind.

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This article uses to the Ford F-150 (1997-2008).

The optimistic Crankcase Ventilation valve, likewise referred to as a PCV valve, was one of the an initial emissions related components to be fitted on vehicles. In short, the PCV system routes vapors from the pressurized crankcase ago into the entry manifold, wherein they room eventually burned during the normal process of combustion. A normal occurrence during the combustion procedure is come have tiny amounts of fuel and also other byproducts do their way into the crankcase by seeping previous the piston rings. To stop these contaminants native condensing in the crankcase and causing sludge, fuel contaminating the engine oil, or extreme crankcase pressures, a PCV valve is in location to allow the vacuum of the engine come siphon vapors from the crankcase and also reduce pressure and also the formation of moisture.

A PCV valve can fail in a selection of ways and cause a number of issues, including extreme oil consumption, engine misfires, too much oil leaks from high crankcase pressure, engine hesitation and also loss of throttle response, and sludge contamination. While it performs critical task, a faulty PCV valve is a component that can be quickly and also easily replaced without the use of any type of special tools. This article will overview the PCV valve instead of procedure for the 1997 to 2008 Ford F-150 models.

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Step 1 – Locate and also remove PCV valve

Despite the miscellaneous changes between each version year, the PCV valve is frequently located in the passenger next valve cover.

As mentioned, numerous PCV valves are located on the passenger next valve cover; however, some later 5.4L Triton V8"s will have them mounted in the driver side valve cover/intake manifold. These later on engines carry out not usage an yes, really PCV valve every se, but instead utilize a hose the incorporates a heated valve the is claimed to have an extended service life contrasted to a traditional valve.

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Figure 1. Passenger side valve cover with PCV valve.

Remove the water tap from the end of the PCV valve. Note that some engines will have actually a water tap clamp securing the water tap to the end of the PCV valve, vice versa, others will certainly not and also can be just slid turn off of the finish of the valve. Also, later year models making use of a heated valve will need the electric harness to be disconnected prior to valve removal.

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Figure 2. Removing breather water tap from PCV valve.

Depending on the engine, part PCV valves can simply be slid out of their rubber grommet in the valve cover, if others might be organized down through two little bolts. In some cases, a wrench or pliers might be compelled for removal, as part valves screw fully into the valve covering or lock into the valve sheathe via a 1/4 turn quick connect.

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Figure 3. Removed 1/4 turn PCV valve with flexible wrench.
Pro Tip

When replacing the PCV valve, that is very recommended the you inspect any hoses and also rubber grommets for splits, cracks, or holes and replace if necessary.


Step 2 – Install new PCV valve

Before attempting to install the new PCV valve, to compare it through the old unit to ensure they room the same. With variations in design, the is typical for individuals to finish up through the not correct valve.

Install the brand-new PCV valve into the valve cover or input manifold (depending top top engine model). For valves using a on slide fit right into the grommet, a irradiate coating the oil or silicone spray can help in installation. If a 1/4 turn architecture is used, on slide the valve right into the valve cover and turn the clockwise until it locks securely in place. Similarly, if you have a threaded valve or a valve that uses hold-down bolts, simply tighten the valve or bolts till they bottom out and the valve is secure.

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Figure 4. Brand-new PCV valve prepared for installation.

Attach the water tap to the PCV valve. Install any kind of hose clamps and the electrical plug if applicable.

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Figure 5. New PCV valve set up (1999 5.4L engine shown).

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Pro Tip

A classic PCV valve can frequently be tested by shaking it. If the inspect ball within is loose and rattles freely, the valve is considered to it is in in an excellent working order.