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Not sure of the differences between 89 and 91 but on a 91 you will find it underneath the intake manifold. On the passenger side of the engine the PCV valve will be attached to a vacuum line and inserted into the top of the valve cover. It is difficult to get to because the space between the intake and valve cover is relatively small. Once you get your hand in there it just pulls out. Pretty simple replacement.

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17y ago

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