- WHISTLING AND HUMMING NOISE
They indicate a failure in the accessory drive, and in the valvetrain. Usually, a whistling sound occurs due to a stretched belt or a broken tensioner. Humming sound is a symptom of a broken bearing. It is very dangerous to ignore these malfunctions.
For example, a jammed bearing of the cooling pump or the alternator may cause belt breakage, which leads to complete inoperability of the ancillary equipment.
It is even worse if unusual sounds are heard from the timing belt: its breakage leads to valve deformation and results in engine overhaul.
- RATTLING SOUND
This sound usually appears when the variable valve timing mechanism fails. Sometimes, it can be heard when the camshaft position sensor is broken. Failure of these elements results in engine malfunctions, thus reducing its power.
Sometimes, a rattling sound may be caused by a stretched timing chain. Like with the belt, this failure should be fixed immediately.
- NOISY VIBRATION
It indicates worn engine mounts or failure of a spark plug.
- KNOCKING SOUND
It is one of the most common symptoms of engine malfunction. It indicates many failures: valve damage, worn camshaft bearings, cylinder and piston failures. The nature of the knocking sound may be used for pinpointing the defect.
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