If the engine stalls at idle when the EGR is fully opened, the EGR system can be assumed to be working at peak efficiency.

Question

Quizplus · Accepted Answer

The EGR (Exhaust Gas Recirculation) system is designed to reduce NOx emissions by recirculating a portion of an engine's exhaust gas back to the engine cylinders. If the engine stalls at idle when the EGR is fully opened, it indicates a problem, such as excessive exhaust gases being recirculated, which can disrupt the air-fuel mixture balance, not peak efficiency.

If the Engine Stalls at Idle When the EGR Is