Integra models are not equipped with an EGR system. The EGA system reduces oxides of nitrogen by recirculating exhaust gas through the EGA valve and intake manifold into the combustion chambers. It consists of the EGA valve, the eve valve, the EGA control solenoid valve, the Electronic Control Unit (ECU), and various sensors. The ECU memory is programmed to produce the ideal EGA valve lift for each operating condition, with a lift sensor detecting the amount of EGA valve lift and sending this information to the ECU, which compares it with the ideal lift determined by data from other sensors. If there is a difference, the ECU triggers the EGA control solenoid valve to adjust the vacuum applied to the EGA valve. To check the EGR valve, start the engine and allow it to idle, then detach the vacuum hose from the EGA valve and attach a hand vacuum pump. Apply vacuum to the EGA valve; it should remain steady while the engine runs poorly. If the vacuum does not remain steady or the engine does not run poorly, replace the EGA valve and recheck. If the vacuum remains steady but the engine does not run poorly, remove the EGA valve and check for blockages in the valve and intake manifold, cleaning or replacing as necessary. For the EGR control system, detach the number 5 vacuum hose from the three-way joint and attach a vacuum gauge, then start the engine and wait for it to reach normal operating temperature. There should be manifold vacuum, and further checking of the EGA system requires special tools and equipment, so take the vehicle to a dealer service department or qualified repair shop. If EGR valve replacement is necessary, remove the air intake duct, unplug the electrical connector for the EGA valve lift sensor, and remove the two nuts securing the EGA valve to detach it. Clean the mating surfaces of the EGA valve and adapter, install the new EGA valve with a new gasket, tighten the nuts securely, and plug in the electrical connector.
