The intake system applies to all Honda Civic models from 1992-1995.
Air Intake System
System consists of an air cleaner, air intake pipe, throttle body, Idle Air Control (IAC) valve, fast idle mechanism and intake manifold. On all models, a resonator chamber in the air intake pipe reduces noise as air is drawn into system.
Intake Control System
The intake control system consists of an intake control diaphragm and an intake control solenoid valve. When engine speed drops to less than 3500-4000 RPM and engine air requirements drop, the ECM activates the intake control solenoid valve. This supplies intake manifold vacuum to intake control diaphragm. Intake control diaphragm closes off one of the 2 air intakes, along with resonator chamber, and reduces intake air noise.
Throttle Body
Throttle body is a single-barrel sidedraft type. Lower portion of throttle valve is heated by engine coolant from cylinder head. Idle adjusting screw (to increase and decrease by-pass air) and canister/purge port are both located on top of throttle body.
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