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1988 Toyota Celica EXHAUST EMISSION SYSTEMS

September 15th, 2008 · No Comments

The Exhaust Gas Recirculation (EGR) system is used for the reduction of NOx emissions by lowering combustion temperatures. Recycling metered amounts of exhaust gas back into the intake system lowers combustion temperatures. Each system has a vacuum-operated EGR valve and a vacuum modulator. Temperature sensing devices control EGR operation. Temperature sensing device used could be a Vacuum Switching Valve (VSV), a Bi-Metallic Vacuum Switching Valve (BVSV), a Thermostatic Vacuum Switching Valve (TVSV), Vacuum Control Valve (VCV) or a combination of these valves. A check valve, EGR cooler and computer may also be used on some models.

OPERATION
When engine is below operating temperature, no exhaust gas recirculation is obtained. Increase in engine temperature allows control valves to regulate vacuum to EGR valve for gas recirculation. Vacuum modulator is used to regulate exhaust backpressure, balance atmospheric pressure and vacuum to allow EGR operation at heavy throttle. The EGR cooler, used on the Cressida and Supra assists in reducing exhaust gas temperature before entering combustion

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