Rev Up and Soar: ACE the AMP Aviation Maintenance Technician Powerplant Exam 2025!

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Question: 1 / 400

When troubleshooting an engine that will not idle, what would be a probable cause?

Economizer valve is not operating correctly.

When troubleshooting an engine that will not idle, one probable cause could be that the economizer valve is not operating correctly. This valve is responsible for controlling the amount of air and fuel mixture going into the engine, and if it is not functioning properly, it can lead to issues with idling. Option B is incorrect because a mixture that is too rich would actually cause the engine to idle too high rather than not at all. Option C is incorrect because the manifold valve, which controls the air intake into the engine, would not directly affect the idle. Option D is incorrect because clogged fuel lines would likely cause issues while the engine is running, rather than just with idling.

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Mixture setting is too rich.

Manifold valve is not operating properly.

Fuel lines are clogged.

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