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I just tried to answer this myself earlier today. The service manual shows it just behind the valve cover, but it ain't there. There is a breather hose that goes directly to the air filter housing. The only other place it could be is on the block somewhere in the back, below the intake manifold.

It is in fact below the IM. The best way to get at it is to do it during an oil change. Drain the oil pan, then pull off the oil filter. The PCV Valve is just above the oil filter. A pair of needle nose pliers are needed to pull the clamp off to remove the vacuum line the PCV Valve is in.

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โˆ™ 2010-08-17 19:43:29
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Q: Where is PCV valve on a 98 Honda Civic LX and how do you change it?
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