This causes nitrogen oxide emissions to rise and the engine might start to knock. Hard starting because, the valve is not closing and is creating a, vacuum leak into the intake manifold.You may also find a, P0300 random misfire code on, OBD-II vehicles. Rough idle or misfiring because, the valve is not closing and is, leaking exhaust into the intake manifold.Consequently, carbon may be plugging up the exhaust port. Pinging (spark knock or detonation) because, the (EGR) system is not working.
Over time, the vehicle will lose acceleration power and certain symptoms will manifest, such as persistent stalling. On the other hand, if the valve becomes stuck in an open position the engine will become saturated at an even faster rate. Consequently, the vehicle will continue to run properly, however it will emit nitrogen oxides at levels, beyond the threshold. Therefore, If it becomes stuck in the closed position, it will lose all function. Fuel Injector Partially CloggedĪs for the valve itself, soot and grime may prevent it from properly, opening and closing. Consequently, fuel injectors, which are delicate and expensive components of the engine, may become partially clogged.
Furthermore, soot forms where the exhaust passes into the intake and even within the valve itself, causing various problems. But, the amount of recirculation has to be controlled otherwise it can have an adverse effect as a, huge vacuum leak. So, intake vacuum in the intake manifold, sucks exhaust back into the engine.
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