Question about 1990 Toyota Pickup

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1990 toyota 22re 4 speed has vacuum pressure in the valve cover

My 1990 toyota with a 22re 4speed has vacuum pressure in the valve cover.While the engine is running and you remove the oilcap, the engine will stumble and almost die.You can feel the cap get suction as you lift it.What could be causing this? Valve adjustment???

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THIS is normal on a lot of import engines. you have a pcv valve that pulls vacuum on engine to **** out gases. when you remove the cap it is like a vacuum leak. if engine runs fine otherwise it is normal.

Posted on Oct 10, 2008

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