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What is the reason for engine noise disappearing when the oil dipstick is removed?

1 Answers

LaneDella

07/29/25 4:20pm

It may be due to a damaged valve cover. The excessive crankcase exhaust gas caused by the vacuum valve inside the valve cover leads to the noise disappearing when the oil dipstick is removed. Below is a detailed introduction about automobile engines: 1. Automobile engine: The automobile engine is the device that provides power for the car, serving as the heart of the vehicle, determining its power, fuel efficiency, stability, and environmental performance. Depending on the power source, automobile engines can be divided into diesel engines, gasoline engines, electric motors for electric vehicles, and hybrid systems. 2. Advantages: Common gasoline and diesel engines are both reciprocating piston-type internal combustion engines, converting the chemical energy of fuel into the mechanical energy of piston movement and outputting power. Gasoline engines have high rotational speed, light weight, low noise, easy starting, and low manufacturing costs; diesel engines have a high compression ratio, high thermal efficiency, and better fuel economy and emission performance compared to gasoline engines.

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