I have an 89 Nissan Max. Please explain the Idle to me.?

Question:
I took my car to get a smog I believe it needs a new idle sensor but the labor is expensive what does it do and is it really that important or are they just trying to get over on me cause I'm a girl?

Answers:

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Idle air control valve Air conditioning idle air valve all made into one. Manual base idle and computer controled idle speed. You did not state why the car failed smog? Yes the reason seems weard "idle sensor"

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The idle sensor in short reads the amount of air and fuel coming into your cylinders. If it reads incorrectly, it will cause your engine to idle at higher RPMs because it reads that the engine is not receiving enough of either air or fuel. If your car is idling high (I don't know the normal idle for an 89 Maxima, but it shouldn't be more than about 800-1000RPMs) then it could possibly be the issue. Take the car to a different mechanic and get a second opinion also.

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