An EGR valve that remains open with the engine idling is unlikely to affect engine performance.

Name: An EGR valve that remains open with the engine idling is unlikely to affect engine performance.
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Quizplus · Accepted Answer

An EGR (Exhaust Gas Recirculation) valve that remains open with the engine idling can cause rough idling, stalling, and reduced engine performance because it allows too much exhaust gas to enter the intake manifold, disrupting the air-fuel mixture.

An EGR Valve That Remains Open with the Engine Idling