How to perform a Vacuum Leak test

One of the fundamental tests often mentioned in our forums is a vacuum leak test. It’s a diagnostic tool that can be the source of many problems you may be having. Think of your car’s engine as a big vacuum cleaner that sucks in air in measured amounts, mixes it with fuel, and then pushes the dirty air leftover after the explosion out a controlled series of pipes and outside. While we’ve discussed problems with moving the dirty air out (aka exhaust back pressure testing), we have not discussed bringing air into the engine.

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