Vehicle Questions and Answers
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If your Honda Fit is having a rough idling issue, it may be due to faulty ignition coils/spark plugs or a vacuum leak. A leaking vacuum hose can lead to poor engine performance and rough idling. This hose is a crucial part of a modern vehicle's fuel injection system, assisting the engine's computer in calibrating the fuel injector pressure. When a loose hose causes a vacuum leak, the engine speed can fluctuate because the computer receives inaccurate information. If you have not replaced the vacuum hose in your vehicle recently, it could be contributing to the rough idling problem.
If you notice that your Honda Fit is idling roughly, the issue may stem from malfunctioning ignition coils or spark plugs, or possibly a leak in the vacuum system.