In which system are leaks likely to cause a whistling sound?

The intake system is associated with whistling sounds due to the nature of air movement and pressure changes. In an intake system, air is drawn into the engine, and if there is a leak, it can cause turbulence as the air flows through the compromised area. This turbulence can result in a whistle or hissing sound as the air is forced through a narrow opening, disrupting the smooth flow of air that is characteristic of a properly functioning intake system.

This phenomenon is particularly noticeable in vehicles with turbochargers or superchargers, where the intake air is under pressure. A leak in these systems can lead to the whistling sound becoming more pronounced. Understanding the characteristics of the intake system helps in diagnosing issues based on sound, which is critical for effective maintenance and repairs.