What are the symptoms of a damaged EGR valve?

1 Answers
SimonLynn
07/29/25 12:53pm
egr valve damage symptoms: extremely unstable idle or even stalling, malfunction indicator light flashing, failing annual emission inspection, burning engine oil, blue smoke from exhaust; when the EGR valve remains open, the car may exhibit black smoke, lack of acceleration power, and increased fuel consumption; when the EGR valve remains closed, it can affect the vehicle's exhaust emissions, potentially causing it to fail the annual inspection. Causes of EGR valve damage: 1. Quality issues with the exhaust gas recirculation system itself; 2. Improper maintenance; 3. Fuel quality problems; 4. Aging of the wastegate valve. The function of the EGR valve is to appropriately reduce fuel consumption, improve engine efficiency, lower exhaust temperature, and reduce the formation of nitrogen oxide compounds and carbon monoxide.
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