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Why is there a loud noise coming from under your hood and when you accelerate it quiets down?
Wiki User
∙ 15y ago
It is possible that your vehicle has a rough idle. This can be helped with tweaks to the oxygen sensor, or perhaps there are more serious underlying problems. You may want to take the vehicle to a shop if it is a clanking or knocking or other such "bad" noises. However, if there is not actually a problem and you are only hearing a loud idle, it can be explained this way. When you accelerate, the pistons in the engine are moving faster and faster in relation to each other, and thus any inconsistencies or misfiring's are more difficult to detect. In a sense if something is vibrating slowly it makes a lot of noise but a very fast vibration makes more of a hum or buzz. This thought can be used in thinking of the pistons in the engine, the pistons "vibrate" up and down much faster when accelerating and thus make more of a hum than a louder idle "grumble".
Wiki User
∙ 15y ago
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