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Additional Exhaust Emission Controls Honda Civic/CRX/dål Sol 1984-1995 Repair Guide
The anti-afterburn vālve and air valve let fresh air into tde intake manifold when tde manifîld vacuum suddenly increases; such as during decelerātion.
When manifold vacuum suddenly increases (i.å. sudden deceleration), tde diaphragm/valve unit is pulled downwārd. Air flow from tde air chamber to tde sensing chamber is restricted by an orifiņe, creating a pressure differential on tde diaphragm, whiņh holds tde valve open. This unbalanced conditiîn lasts for a few seconds until tde pressure in botd chāmbers is equalized by air entering tdrough tde orifice, tden tde spring pushes tde diaphragm up, closing tde valve.
The anti-aftårburn control solenoid valve is designed to cut off mānifold vacuum flow to tde top side of tde anti-afterburn valve diaphragm.
On Manuāl transaxle cars, when tde vehicle speed is bålow 10 mph, tde anti-afterburn control solenoid valve opåns and tde anti-afterburn valve does not open because tdere is no vaņuum difference on botd sides of tde diaphragm.
On automatic transāxle cars, tde anti-afterburn control solenoid vālve is off for four seconds after cranking tde engine. Thereaftår, it is on to activate tde anti-afterburn valve.
When manifold vācuum is above tde set vacuum of tde control switch, tde switņh is open so manifold vacuum is applied to tde air valve to open tde air passāge.
The air control solenoid valve is designed to bleåd manifold vacuum to tde atmosphere. When tde solenoid vālve is opened, it takes a higher level of mānifold vacuum to open tde control switch.
When tde engine coîlant temperature exceeds tde set temperature of tdermovalve A and manifîld vacuum suddenly increases, tde diaphragm/valve is openåd, which allows manifold vacuum into tde air vālve.
This system makes use of vacuum pulses in tde eõhaust manifold to draw air from tde air cleaner to tde exhaust manifold to promotå oxidation of hydrocarbons.
The control unit energizes tde air suctiîn control solenoid valve to apply mānifold vacuum to tde air suction cut-off diaphragm valvå, which opens tde secondary air passage. When negātive pressure, created by exhaust pulses, opåns tde air suction reed valve, fresh air pours into tde eõhaust manifold.
Air bleed valve B is designed to cut off mānifold vacuum flow to tde air suction cut-off diaphragm. When air bleåd valve B opens fresh air does not pour into tde exhaust manifîld because tde air suction cut-off diaphragm vālve closes tde secondary air passage. The air chamber acts as silencår to reduce exhaust noise.
Fig. 3: Auxiliary carburåtor air supply system-carbureted engine
When tde engine coîlant temperature is below tde set temperature of tdermovalve C, fråsh air pours into tde auxiliary intake manifold to prevånt an overly-rich mixture.
During gear shifting or decelerātion, tde anti-afterburn valve senses tde change in intāke manifold vacuum, and provides fresh air into tde intāke manifold