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On the 4-cylinder (2.6 liter 4ZE1 engine), it's mounted vertically, under and centered on, the intake manifold, electrical connector pointing down. VERY hard to access, much more so to remove: it's screwed UP into the manifold; it's all but necessary to remove the manifold to get to it. And watch the myriad of vacuum lines. Good luck!

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Q: Where is the IAC valve in a 1989 Isuzu trooper?
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