The Volkswagen Jetta EGR Valve is a low-profile yet effective method of enhancing engine performance and air quality by adding a controlled amount of exhaust to the incoming air charge, reducing combustion temperature and significantly reducing damaging NOx. The small metal gate has served for decades and has fit perfectly between the exhaust manifold and intake of all generations of Jetta, including early carbureted sedans and the recent turbocharged models, making it a plug-in option that still allows retaining factory drivability. When it is in cruise or light throttle, it opens enough to mix about 5 to 15 percent inert gas to fill the vacuum that would otherwise be filled by oxygen, and the burn never gets to the 2,500-degree mark where nitrogen oxides develop, and at idle or full throttle it closes tightly to maintain high power and smoothness. All these, the second-generation vacuum design, later backpressure style, and the modern computer-directed linear motor versions, are based on the same strategy, but the electronic unit has a built-in position sensor that feeds the powertrain control computer with the precise flow information to make instant corrections, providing modern users with a sharp throttle response and cleaner emissions in a single package. This wide fit is why the EGR Valve is a smart-money long-lasting investment. The EGR Valve also prevents spark knock because it lowers peak cylinder pressure and thus protects pistons, and it provides an additional level of protection on the long climbs of the highway. Its long life is important to owners, and alloys of high quality resist corrosion, and the compact housing can be installed without the use of special tools. In case carbon drastically slows down the movement, the control unit will issue a warning long before any damage is done; this is done by flashing a warning, hence it can be addressed easily without expensive repair work. To the shoppers who compare the compact sedans, the smart emission control ensured by this component makes it easy to understand why the Jetta image of a dependable and performance-effective vehicle has never been shaken and why Volkswagen is still leading in its category.
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