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Where is the PCV Valve on my EJ18? 1994 impreza


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What does this do exactly? How does it affect the performance?

 

Positive Crankcase Ventilation. It routes unburned gases from the crankcase into the intake manifold to be burned. If it hasn't been changed lately or when you take it out and shake it, it doesn't make noise like something is loose (the valve) then change it. Lose of power, rough running, oil in the airbox are all signs the PCV valve needs changing.

These things are too cheap to keep.

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The "bolt" is the valve itself. You may need to soak the threads with some penetrating oil to loosen it. Then use a little anti-seize on the threads of the new one.

 

The pipe is a rubber hose. Suggest you take it off and clean it out inside with brake or carburetor cleaner.

 

Good luck!

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