Genuine Acura Legend EGR Valve

The Acura Legend EGR Valve maintains combustion temperatures within the limits to reduce harmful NOx emissions and to protect against engine knock by recirculating exhaust gases. This EGR Valve is positioned between the exhaust passages and the intake manifold. It only opens when your car is cruising on a steady and low throttle so that the inert exhaust mixture dilutes the fresh air fuel mixture to lower peak heat. Early Legend engines applied a vacuum diaphragm style EGR Valve that was responsive to both ported vacuum and backpressure, while later styles were built based on computer-managed EGR Valve units that use internal motors and feedback sensors for accurate flow. Despite the difference in the method of actuation, each Acura system in the Legend is designed to do the same thing, deliver 5 to 15 percent exhaust into cylinders without upsetting idle or full power. Positive and negative backpressure designs will vary the opening depending on the exhaust pulse strength while linear electronic styles use pulse width signals for smooth, incremental movement. Carbon buildup can cause the EGR Valve to jam and cause warning lights to go on, rough idling or spark knock until cleaned or replaced. This small part is routinely monitored to help keep an Acura running clean so every Legend made by Acura stays within strict smog rules.

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