* It should be specified in the owners manual, and if not, they are relatively cheap ($3-$8) so you could do it when you do a tune up. Check it by popping it off with the engine off (it is located on the top of the engine usually and connected by a small hose) and shake it. It should rattle. If not, it is clogged and needs to be replaced. Here are more opinions and answers from FAQ Farmers: * PCV valves are probably the easiest and cheapest part of keeping the engining running smoothly. They should be changed annually or at least every 2 years. * How often? NEVER. Trade secret among mechanics is take it off every 10-15k miles and soak it in gasoline or other solvent to remove all the gummy oil deposits left by venting the crankcase.All it is is a check valve that is activated by the amount of vacuum a motor creates. I've never bought a new PCV valve for any of the cars I've owned since I started driving 35 year ago. Back then of course,you could work on your car unlike today.Lift the hood and you can't even see the road where as before,you could climb inside under the hood and still have enough room to work.Now you HAVE to bring your car back to the dealer to have it worked on because of all the sensors,valves,computer modules etc etc.People...it's a scam! Save your money on a new PCV valve and just use a little gas from your lawn mower to clean the one you have. * The pcv should be replaced every 35,000 miles. Just cleaning the pcv is not enough. The part that fails on the pcv is the spring and cleaning it will do nothing. This part is cheap and can have a significant impact of gas mileage and on how smooth the car runs. Not the place to be cheap.
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