The PCV valve is an frequently overlooked maintenance item that have the right to lead to part pretty significant engine related issues if left unchecked. Over time, the PCV valve can come to be contaminated with oil and also moisture that will cause the valve to stick in the opened up or closeup of the door position, hence limiting its function. A timeless PCV valve will generally last 75,000 miles, however with that being together an cheap part, countless individuals opt to change them at 30,000 mile intervals for item of mind.

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

The confident Crankcase Ventilation valve, likewise referred to as a PCV valve, was one of the first emissions related contents to be fitted on vehicles. In short, the PCV system routes vapors from the pressurized crankcase back into the entry manifold, whereby they are eventually shed during the normal procedure of combustion. A normal occurrence throughout the combustion process is to have little amounts the fuel and also other byproducts make their method into the crankcase by seeping previous the piston rings. To prevent these contaminants from condensing in the crankcase and causing sludge, fuel contaminating the engine oil, or excessive crankcase pressures, a PCV valve is in ar to allow the vacuum that the engine come siphon vapors from the crankcase and reduce pressure and the development of moisture.

A PCV valve have the right to fail in a selection of ways and also cause a variety of issues, including too much oil consumption, engine misfires, too much oil leaks native high crankcase pressure, engine hesitation and loss of accelerator response, and sludge contamination. While the performs critical task, a faulty PCV valve is a component that deserve to be quickly and easily changed without the usage of any kind of special tools. This article will overview the PCV valve replacement procedure because that the 1997 come 2008 Ford F-150 models.

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Step 1 – Locate and remove PCV valve

Despite the miscellaneous changes in between each design year, the PCV valve is typically located in the passenger side valve cover.

As mentioned, many PCV valves are situated on the passenger next valve cover; however, some later on 5.4L Triton V8"s will have them installed in the driver side valve cover/intake manifold. These later engines perform not use an yes, really PCV valve per se, however instead use a hose that incorporates a boil valve that is an alleged to have an extensive service life compared to a traditional valve.

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Figure 1. Passenger next valve cover v PCV valve.

Remove the water tap from the end of the PCV valve. Keep in mind that part engines will have actually a hose clamp securing the hose to the finish of the PCV valve, whereas others will certainly not and can be just slid off of the end of the valve. Also, later on year models utilizing a boil valve will call for the electrical harness to it is in disconnected before valve removal.

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Figure 2. Removing breather hose from PCV valve.

Depending top top the engine, part PCV valves can simply be slid out of your rubber grommet in the valve cover, when others may be held down through two tiny bolts. In part cases, a wrench or pliers may be forced for removal, as part valves screw completely into the valve covering or lock into the valve covering via a 1/4 turn fast connect.

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

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


Step 2 – Install brand-new PCV valve

Before attempting to download the new PCV valve, to compare it v the old unit come ensure they space the same. V variations in design, the is usual for people to end up through the wrong valve.

Install the brand-new PCV valve right into the valve cover or input manifold (depending ~ above engine model). Because that valves making use of a slip fit into the grommet, a irradiate coating of oil or silicone spray can assist in installation. If a 1/4 turn architecture is used, on slide the valve right into the valve cover and also turn it clockwise until it locks securely in place. Similarly, if you have a threaded valve or a valve that makes use of hold-down bolts, just tighten the valve or bolts till they bottom out and also the valve is secure.

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Figure 4. New PCV valve ready for installation.

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

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

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Pro Tip

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