What are the symptoms of a faulty exhaust valve in the Audi A6L 2.8?

1 Answers
CarlosFitz
07/30/25 3:04am
Audi A6L 2.8 exhaust valve failure symptoms include unstable idling speed, noticeable body vibration, and in some cases, inability to accelerate. Methods to determine if the exhaust valve is damaged: The simplest and most effective method is to loosen the engine oil cap. When removing the oil cap, check if it feels suctioned. If there is significant suction, it indicates a faulty exhaust valve. Introduction to the exhaust valve: Also known as an oil separator or pressure control valve, it is installed between the compressor outlet and the condenser inlet. Through separation, it improves the heat transfer efficiency in the condenser and evaporator. For systems where lubricating oil and refrigerant have poor miscibility, the oil separator is particularly important.
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