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AV-SCANNER / Service function guides / Engine and oil
This guide covers the complete process of pressure testing an intake system to locate boost leaks, from understanding the system's operation to performing the test and interpreting results. It is written for working mechanics and serious DIYers who already have basic hand tools and a willingness to work methodically. By the end, you will be able to safely pressurize an intake tract, use soapy water and gauges to find leaks, and decide which repairs are needed. The guide also explains how the procedure changes across vehicle types and how to avoid common mistakes that lead to false results.
Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.
Download all 12 sections as a branded PDF to use in the workshop.
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