SOS Mechanic Certificate – Engine Repair Practice Exam

Question: 1 / 400

What adjustment might be needed if an engine is idling too high?

Adjusting the idle speed or checking for vacuum leaks

When an engine is idling too high, adjusting the idle speed is directly relevant to bringing it back to the manufacturer's specified idle RPM. This adjustment can often be made through a simple screw or electronic controls in modern engines. Additionally, checking for vacuum leaks is crucial because leaks can introduce excess air into the intake manifold, which can cause the engine to idle faster than intended.

Addressing these two factors—idle speed and vacuum integrity—ensures that the air-fuel mixture remains balanced, which is essential for stable engine operation. Any imbalance may lead to performance issues or even engine damage over time. Consequently, this answer encompasses the primary and most immediate solutions for correcting a high idle condition.

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Increasing the fuel pressure or replacing the air filter

Changing the spark plugs or adjusting the fuel injectors

Removing the idle air control valve or cleaning the throttle body

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