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Why are there so many control valves on the intake manifold? What do they all do?
I see that the intake manifold has a plethora of different devices - familiar ones like the idle air control valve (IAC), the infamous fast idle thermo valve (FITV), and then some mysterous ones such as the "air boost valve" (P/N 17340-PT2-000, item 9) and the "bypass control solenoid valve assembly" (P/N 36163-PT2-004, item 23).
Re: Why are there so many control valves on the intake manifold? What do they all do?
The air boost valve is just that, it gives the intake a boost of air during startup. The intake air bypass, or IAB system, is a set of secondary throttle plates in the intake. The IAB solenoid is controlled by the ECU and activates these secondary throttles to change the path of intake air. There are 2 sets of intake runners on the bottom half of the intake manifold. The longer runners are used for lower RPM and the shorter runners are for higher RPM.
if you google IAB's or intake air bypass I'm sure you can find a more in depth description.
Why are there so many control valves on the intake manifold? What do they all do?
