What is the reason for the abnormal noise in the Hyundai Tucson engine that disappears after acceleration?
3 Answers
Hyundai Tucson engine abnormal noise that disappears after acceleration may be caused by cylinder valve failure or insufficient engine oil. The following are related explanations: 1. Engine abnormal noise: When accelerating, the engine may produce a whirring sound, or it may also occur when decelerating. In general, the sound changes with RPM. Possible causes include lack of power steering fluid, damaged generator bearings, issues with the power steering pump or water pump, all of which can cause similar noises. 2. Noise disappears after acceleration: The reason why the Hyundai Tucson engine noise disappears after acceleration may be due to contaminants inside the engine. It is recommended to replace the engine oil and oil filter, and clean the engine.
I often work on Hyundai Tucson vehicles and encounter situations where there's abnormal noise during engine idle, which quiets down after accelerating. This is mostly due to issues with the belt or tensioner pulley—at low speeds, the loose belt jumps and makes a squeaking sound, but when you accelerate, the increased RPM tightens the belt and the noise disappears. It could also be caused by chain or water pump bearing wear, where noise appears during idle when vibrations are stronger. I recommend first checking the belt tension to see if it's aged or cracked; inspect the oil level to ensure sufficient lubrication; if the noise is more noticeable during cold starts, there might be an issue with the valves or hydraulic lifters. Don't delay, as minor issues can escalate into major repairs—a broken chain can be troublesome. Regular maintenance should include checking the belt and tensioner pulley, which should be replaced approximately every 50,000 kilometers to keep the engine running smoothly.
As a Tucson owner, I've also experienced the issue of abnormal noise at idle that disappears after accelerating. This is usually related to the fuel system—carbon buildup or clogging in the fuel injectors at low speeds can cause poor fuel spray and result in a ticking sound. When accelerating, the engine load increases, fuel injection volume rises, and the carbon deposits get flushed away, stopping the noise. After adding some fuel system cleaner myself, the problem improved significantly. It could also be caused by an air leak in the intake system or faulty sensors like the mass airflow sensor, where issues become more noticeable at low RPMs. Regular maintenance is crucial—using high-quality fuel and periodic throttle body cleaning can prevent such issues. If the noise persists, it's best to visit a professional shop to inspect the fuel system to avoid a sudden increase in fuel consumption or starting difficulties. Remember to share your experience with fellow car owners—small issues, if left unresolved, can impact driving safety.
