I believe it is on the top of the passenger side valve cover.I had a 1991 240SX and I believe that is where it is located.If not then check the drivers side valve cover.It would most likely be silver at the bottom and black plastic at the top with a hose going to it. ..AnswerI had the same problem. It is very hard to reach. It is under the intake manifold. It only looks like a nut with two hoses connected to it. I have not replaced it since it is hard to reach.
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