A boost leak test is a procedure used to identify leaks in the boost system of a turbocharged engine. The boost system is responsible for increasing the pressure of the air entering the engine, which results in increased power. Leaks in the boost system can cause a loss of power, as well as other problems such as engine damage.
There are a number of different ways to perform a boost leak test, but the most common method is to use a boost leak tester. A boost leak tester is a device that pressurizes the boost system and then uses a soapy solution to identify leaks. Any leaks in the system will cause bubbles to form in the soapy solution.