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9

It is the sound of the fuel pump priming and pressurizing the fuel lines, which is absolutely normal. VW likes to use the opening of the driver door to trigger fuel rail pressurization. In fact, one could use the absence of the sound of the fuel pump as a tell-tale sign that the fuel pump relay is not functioning properly. As @Paulster2 points out, either ...


3

tl dr; More pressure = less noise. Here is a pretty good write-up about the affects of tire noise. In the write-up it states the following: Tires running higher inflation pressures generate lower noise levels compared to those with lower inflation levels. This holds true to my line of thought because a flat tire (or very low tire) will make a lot ...


1

Tyres pumped up to 45 bar would probably explode... What car do you have, as even 45psi sounds high for a normal car? You should always inflate your tyres to the manufacturer's recommended pressure. Over-inflating will lead to increased wear (so you'll have to replace them more quickly, negating any fuel saving!), and poorer grip and handling, leading to ...


1

Jack the back of the car up, and spin the wheels by hand - comparing the two sides so you can tell what's different on the bad side. Try to shake the wheel vertically and horizontally - a worn wheel bearing will have more play in it than a good one. When spinning the wheel without load, a worn wheel bearing will make a slight rumbling sound, and might seem ...



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