Corolla 1.2t is particularly noisy when idling. What is the reason? New car for four months

The loud noise at idle speed may be caused by the following reasons:

The oil pressure is unstable, check the oil pressure;

Engine carbon deposition, cleaning the throttle and cleaning the nozzle can be done. Because the throttle of a cold car is easy to accumulate carbon in summer and autumn, it is easy to produce abnormal noise if the throttle is not washed for a long time.

There is something wrong with the ignition system. Check the ignition coil and spark plug.

The engine is idling loudly (when the hood is open), so listen carefully to the sound source. Check whether the exhaust pipe is broken. You can try to hold it down with a big screwdriver. If the engine sound at the exhaust pipe drops obviously, the exhaust pipe is damaged.

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