FAA Powerplant Written Practice Test 2025 – Complete Exam Prep

Question: 1 / 1165

What is the likely outcome of an induction system leak near a cylinder?

A richer mixture

A lean mixture

An induction system leak near a cylinder allows unmetered air to enter the engine, bypassing the carburetor. This results in an increase in the air-to-fuel ratio, which means there is more air relative to the amount of fuel being introduced into the combustion chamber. Consequently, this creates a lean mixture, where the fuel is not sufficient to properly combust with the added air.

A lean mixture can lead to several performance issues such as rough engine operation, overheating, and potential engine damage if not corrected, as the ideal combustion process relies on a balanced mixture of fuel and air. Understanding how induction leaks affect the mixture is crucial for diagnosing engine performance issues and maintaining proper engine operation.

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Higher engine RPM

Lower fuel consumption

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