Engine start noise is coming

My car has an annoying sound as if something is warbling, I noticed I drove it without water then I thought that could have caused the sound but it kept on. I was told it's a bearing, we changed that still makes the sound , was told it's the break disc changed them, sound still there. Please advice as to wht could be wrong. Am failing to pick exactly where it's coming from.

After sharing the battery of my vehicle so as to start another car, I've installed it back in mine and the engine did not start. When the ignition key was inserted, all the dashboard lights turned on, but the fuel needle indicates "zero", when it usually indicates its fuel level. Even more, the fuel pump's sound cannot be heard. The car is fuelled up but, just in case, I added some 5 liters more, but it is all the same. The car sounds strongly, but it seems to be simply injecting air. I've measured the battery and it's got 12,7 volts. The ignition engine belt looks alright. I've disconnected the battery the whole night and connected it back today, as I was told that was the way to reset the computer, but the problem remains. What might be happening?

After reaching a 25 mph speed, a buzzing can be heard coming from the front tires, and it gets stronger as you speed the car up. It is really annoying and I would like to know what might be failing. Stop lights do not turn on either. I've already checked fuses, wiring and sensors but nothing, I've even taken the vehicle to an electrician but he was not able to solve my problem.

It start and immediately stops with low idling and i hear click sound from the engine did mjor service and they adjust rev count but still it starts and cuts immediately

The battery and alternator are good it won't turn over at all no click no nothing it started just before but it sounded like it had a dying battery now it won't even turn over at all

I was on a trip about 60 miles and got side tracked slowed down to turn around and heard this rattling noise but when i got up to speed around 40 and above the noise stopped no warning lights came on no smoking oil level is good temperature normal nothing till i slow down then it starts when i start the car cold it is loud till it warms up then it calms down i listened it is coming from the timing belt area but like i said i have been driving it and at low speeds u can hear it 40 and above nothing sounds normal again like i said no warning lights or smoking or loss of power at all, I have had… Read complete