"Diagnosing" car engines through noise
(Baonghean.vn) - One day when driving to work and you hear loud banging sounds in the engine, knocking sounds when accelerating or sounds like wind whistling... coming from the engine, these are symptoms that show your car needs repair.
Knocking noise in engine
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This is usually bad news, as the loud banging is usually caused by worn or loose connecting rod bearings. Sooner or later the bearings will fail, either the bearings will seize the crankshaft or the connecting rods will fail. In either case, a major overhaul is inevitable.
This damage can be the result of using low viscosity oil, operating the engine under low oil pressure, dirty oil or incorrect engine disassembly, loose engine mounting bolts and nuts.
Knocking sound when accelerating
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This could be a knock phenomenon caused by a malfunctioning EGR valve, a faulty ignition control, engine overheating, carbon build-up in the combustion chamber, or using low octane gasoline.
Noise from the jack
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This is the intermediate power transmission part between the valve and the cam. A worn or rusted lifter causes it to work out of sync with the cam and valve, creating noise. This also causes increased thermal clearance.
Sound like the wind whistling
When you start your car and hear a whistling sound coming from the engine, it is very likely that the engine's cooling system or the engine's vacuum line is leaking. This phenomenon can cause the engine to overheat and make the car consume more fuel.
The sound of metal hitting the bottom of the car
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When you go over rough roads, speed bumps or potholes and hear a metallic noise under the vehicle, you should consider the following parts: tie rods/ball joints, tie rods, stabilizer bars or exhaust system.
Repetitive clicking sound
Does your car have front-wheel drive and make a repetitive clicking noise when driving at low speeds? This is a warning sign of problems with the driveshaft joints. If the noise is coming from the rear of the car, it could be a problem with the rear driveshaft.
"Clacking" or "squeaking" noise in the wheels
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A grinding noise like that of a train wheel, especially when steering at low speeds, can be a sign of a damaged synchronizer joint. This part is the most severe area on a car, transmitting power from the engine to the wheels, resisting resistance from the road surface and allowing the driver to steer as desired, so you should take your car to be repaired as soon as you see "signs of trouble".
