Persistent Tapping Noise - Heavy Knocking Sound from Engine
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Persistent tapping noise from the engine
This noise is a tapping one which speeds up when you speed up and slows down when you slow down. In other words, it taps with the engine, starting the moment you turn the car on.
Thankfully this is usually caused by a stuck hydraulic lifter. Although not to be ignored, it isnt as serious and costly as the tapping noise caused by a damaged engine camshaft. This is a major repair and should also include all of the hydraulic lifters.
Heavy knocking sound from the engine
This is a sound you hope NOT to hear. It is low pitched and banging.
Definitely not a tap sound.
Pull over and check the oil
The moment you are aware of this sound, pull over and check the oil.
This sound often occurs as a result from running the engine without oil. Do not drive the car. Instead bring the oil level up.
Unfortunately though once this sound is heard there is more than likely extensive damage requiring major repair. The noise is caused by worn engine bearings.
Do not ignore!
This must not be ignored but if you drive to a mechanic to repair the problem you run the real risk of engine lock up.
A far more serious problem in that the engine can be damaged beyond repair.
Have your car towed!!