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AV-SCANNER / Accessory guides / Diagnostic
This guide covers the complete professional use of a smoke machine for finding vacuum and evaporative emission (EVAP) leaks quickly and accurately. It is written for working mechanics and serious DIYers who already understand basic engine operation and want a structured, repeatable diagnostic method. You will learn how to select the right smoke machine, set it up safely, perform a full vehicle test, interpret the results with worked examples, and avoid common pitfalls. After reading, you will be able to diagnose intake and EVAP leaks with confidence and know when a problem exceeds the capabilities of a smoke test alone.
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 11 sections as a branded PDF to use in the workshop.
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