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I noticed a few posts from folks (like myself) asking how to replace the pcv valve on their 4.6 engine. I replaced my pcv, and it improved rough idle by about 50% Ford says replace valve at 30K.. my car had 50K miles, so I thought it was time.
Here is what I did:
1) Locate PCV valve on passenger side valve cover..about half way back.
2) Pry clamp holding the hose on top of the pcv valve. The hose will pop off.
3) Turn pcv valve 1/4 turn counter-clockwise. Note in picture.. valve has threads on bottom.. it won't come out of valve cover unless you unscrew it.
4) check 90 degree plastic fittings on the hose that goes from pcv valve to throttle body. Make sure 90 degree bends are not cracked or leaking. If the are leaking vacuum.. you have to buy the entire hose to replace. The part number is shown above. (Press control and move the scroll wheel on your mouse to zoom in on diagram)
5) Screw in new pcv valve
6) replace hose. It will clip on a lock in automaticall when you press down on it.
New Valve cost $18.00 at Ford
New Hose costs $24.00 if you need to purchase it
I worked at Carquest and the aftermarket one will not work. I had to go to my Ford Dealer and purchase it there. There is a small blue clip that you have to press in before the hose will come off the PCV. Don't just pry it off. You will break the retainer. Replacing my PCV also fixed my rough idle. I had 70,000 on my truck. I cleaned the old one with Brake Clean at 50,000.
Last edited by 2004STX4X4; 08-17-2009 at 01:52 PM.
The PCV valve is a control device which sends partially burned gases that come from the engine's crankcase to the combustion chamber. Its name, PCV means Positive Crankcase Ventilation.
Due to its tasks, the PCV valve is not only very useful but also implies important benefits. It completely eliminates crankcase emissions efficiently, avoiding that it becomes an air pollution factor. Besides, it also keeps the system free of moisture due to the constant air circulation that it implies.
Besides, the PCV valve also helps keeping the oil and the engine in proper shape extending their life as well. Also, its mechanism is very important for preventing the appearance of engine corrosion as well as it helps improving fuel economy. This way, the PCV valve is very important for different aspects and helps car owners maintaining their carís engines in shape as well as providing them with a good administration of the fuel economy
The PCV valve routes crankcase partially burned gases back to the engine. Once these gases go back to the engine, they are re-burned, allowing this way a better use and administration of fuel. The cylinders are an important part in the process since they are who re-burn the gases rerouted from the PVC valve and have a central role in it.
Crankcase emissions can be a great source of air pollution, and therefore the PCV valve is very useful and important not only for the car functioning but also for the environment and health as well. Besides, this valve requires little maintenance and must be replaced at about 40.000 miles. This way, the PCV valve is an easy to maintain piece which implies an important amount of benefits that affect not only the car and its owner but also those who surround him and the environment in general due to the way in which it prevents gases from becoming air pollution factors.