Repair 7

The PCV valve on the 1988 Ford Mustang engines is responsible for recycling unburned gas from the crankcase back to the combustion chamber. PVC is defined as positive crankcase ventilation. The PVC valve is considered an emissions component because it prevents the unburned gas from blowing out into the air. The valve has a pressure release ball inside that opens and closes due to pressure from the crankcase. Once a high amount of pressure from the unburned gas pushes against the pressure release ball, the ball will open and release the unburned gas into the combustion chamber.

Instructions

1

Park the 1988 Ford Mustang and open the hood. Set the parking brake to prevent the car from rolling away as you repair it.

2

Locate the silver colored L-shaped PCV valve, located on the valve cover closest to the air filter housing. The PCV valve is inserted into a rubber grommet on top of the valve cover. There are two plastic tubes on top of the PCV valve.

3

Pull the plastic tubes off of the PCV valve with your hands. If the tubes are stuck, twist them as you pull them off.

4

Pull the PCV valve straight out of the rubber grommet seated on top of the valve cover. Wipe down the area around PCV valve and the rubber grommet with a clean rag to remove any dirt or grease.

5

Push the new PCV valve into the rubber grommet and reattach the plastic tubes to the top of the PCV valve. Make sure the new PCV valve is completely seated into the rubber grommet. Close the hood.

The Positive Crankcase Ventilation (PCV) valve prevents vapors from leaking from your 2007 Jeep Libertys engine into the atmosphere. The PCV valve forces harmful vapors back into the combustion chambers, so that they burn off during the fuel combustion cycle. When your Libertys "check engine" light comes on, or when your vehicle fails an emissions test, the PCV valve most likely has failed. Buy a replacement valve from an auto parts store.

Instructions

1

Raise the hood of your Liberty and rest it on the prop rod. Locate the PCV valve protruding from the back of the left cylinder head.

2

Pull the rubber hose straight back off the end of the PCV valve. Unscrew the PCV valve from the mounting area, by hand. Discard the old valve. Thread the replacement PCV valve into the mounting area, by hand, until it is secure.

3

Push the rubber hose back onto the end of the new valve. Push the hose back until it stops, making sure it is tight. Close the hood of the Liberty.

There have been many advancements over the years in the effort to reduce automobile emissions. These include removing additives like lead from gasoline, developing engines that get better mileage and installing parts to reduce emissions. One such part is the PCV valve.

Definition

PCV stands for positive crankcase ventilation. The PCV valve is a spring-loaded, one-way valve that ensures continual evacuation of gases from inside the engine.

Function

The PCV valve sends partially burned gases from the engines crankcase (where the power generated from the engine is converted into the energy that drives your car) back into the combustion chamber (where fuel and air are mixed and exploded under pressure), where the gases are re-burned.

Environmental Benefits

The PCV system helps the environment by eliminating crankcase emissions, removing them as a contributing factor to air pollution. It can also help improve fuel mileage by capturing partially-burned gases and returning them to the engine to be re-burned.

Engine Benefits

A PCV valve can help extend the life of your cars engine by preventing the buildup of sludge in the oil and by keeping moisture out of the engine, preventing corrosion from appearing in the engine.

Considerations

According to Yahoo Autos, varnish deposits can clog the PCV valve, so it must be replaced every 50,000 miles or so. Be sure to use a valve specific to your car--the wrong size valve can allow too much or too little airflow.

A PCV valve--sometimes erroneously referred to as a "PVC valve"--is a Positive Crankcase Ventilation valve, and is responsible for the continual expelling of gas from an engines crankcase. This is a one-way valve. If you do not change your oil at regular intervals, the valve can become plugged and fail, so you should perform regular oil changes. If the valve does fail, youll need to know how to remove it in order to replace it.

Instructions

1

Pull the hood release lever to open the hood of your vehicle.

2

Run your fingers along the inside of the hood to locate the hood release latch. Once you have located it, pull up on the latch to open your hood.

3

Locate the PCV valve, which will be on the crankcase. Look on the top of your engine or on the sides. It is a small rubber plug that is stuck directly into the engine. It looks almost like a rubber bottle stopper.

4

Pull off any hoses that are attached to the valve. There are two main designs of PCV valves. One is directly plugged into the crankcase, while the other is inline with two hoses. If your vehicle has an inline PCV valve, youll need to simply pull the hoses off the valve and then remove the valve itself. If the PCV valve is plugged directly into the crankcase, youll need to grab the end of the valve with your pliers and twist the valve. Youll need to give it a good pull, but it will come out.

The positive crankcase ventilation valve, PCV for short, is an "L"-shaped mechanical component found in vehicles that assists in returning gasses from the engines crankcase, where gasoline is used.

Significance

The PCV valve is just one part of the PCV system, which uses both optimal gasoline performance and is better for the environment. Instead of allowing fumes from the gasoline to ventilate into the atmosphere, the PCV valve sends the gasses back into the combustion chamber to be used again as additional fuel.

Location

The location of the PCV valve within a vehicle brand and model varies with each company. For the 1997 Nissan Altima, the PCV valve is under the hood of the vehicle, in the upper engine area, found mounted in the intake manifold. Most vehicles follow the same PCV placement by the engine, but exact specifications can alternate.

Appearance

The PCV valve is most commonly part plastic and part metal. The valve has two parts: a vacuum on one end that suctions gasses back to the intake manifold, and a metal sphere inside the valve corner, aiding in efficient transfer of gasses.