What are the consequences of an exhaust bypass valve not closing tightly?
2 Answers
It can cause engine oil leakage and excessive fuel consumption. Below is additional information: The basic principle of exhaust gas recirculation (EGR): The fundamental principle of EGR in purifying NOx is essentially a specific application of the heat capacity theory. Since the exhaust gases from the engine contain triatomic gases such as CO2, H2O, and NO2, which have higher specific heat capacities, when fresh air-fuel mixture is mixed with the exhaust gases, the heat capacity of the mixture increases. Heating this diluted mixture requires more heat to raise the temperature by 1 degree, and with the total heat released from fuel combustion remaining unchanged, the maximum combustion temperature is consequently reduced. Types of EGR systems: Mechanically controlled EGR system, Electronically controlled EGR system, Directly controlled EGR system, Indirectly controlled EGR system, Single-valve controlled EGR system, Closed-loop controlled EGR system, Open-loop controlled EGR system.
I've seen this issue of the wastegate not closing properly many times. It directly causes the turbocharger to malfunction, resulting in insufficient boost pressure in the engine. When driving, you'll feel the car lacks acceleration power, stepping on the gas pedal feels like spinning wheels in mud, and climbing hills becomes particularly difficult. Fuel consumption also rises significantly - what used to be 8 liters per 100 km might increase to over 10 liters, wasting your money on gas. Worse still, prolonged operation in this condition can damage the turbo system, causing turbo blades to overheat and deform, with repair costs potentially reaching thousands. Excessive temperatures in the exhaust system may also trigger the check engine light, affecting vehicle inspections. As a car enthusiast, I recommend checking the valve core and seals immediately when noticing power abnormalities, and paying extra attention to exhaust component cleanliness during regular maintenance.
