isn't that sound indicates the mechanism is winding at the throttle body upon key on?

yupe, not the sound from tb.

If u mean once u on your engine the sound appear....havent started yet..

Then the sound is from wira fuel pump..going to kong soon..

me also this sound...aiyoooo

where got...even brand new cars have this sound. Its not the wira fuel pump la

yalor.. when i brand new buy back already can hear the sound d...

Is the fuel pump sound for EFI car. Is just before u start your engine, it pumps up the fuel 1st because it needs pressure to inject the fuel into the combustion chamber. This sound is normal and is depends on the fuel pump. Some car is louder some is not.

When rev can hear the sound from speaker is from the high tension (HT) for our spark plug. There should be a capacitor connected somewhere from the distributer there and ground to the car body.

GKWong to the rescue!!

U know what, i dont understand it at all
Which one, plug, plug cable or fuel pump?

if u mean the aeroplane sound from speaker den is not related to plug n fuel pump 1... changing performance plug cable is 1 of the caused got the aeroplane sound...

So means the sound comes from various source?

really? what specific filter is that? im gona add it soon

i not sure how many source la.. i know changing plug cable is 1 of the source...

u go ask at the ICE specialist shop.... it put at ur HU output there 1..

is the noise really bad? Its only during startup isn't it? While running still got the sound?

nope, not the startup sound. when u press the gas to rev will hear the aeroplane sound d...

All of those "aeroplane sound" is caused by bad grounding. Normally when we rev the engine up and down, the whining sound follows as well because is our alternator generating voltage.
So to prevent this from happen, we can do our own grounding for the alternator with wire to the body. Although the alternator is already mounted to the body, but sometimes the manufacturer bolts that hold the alternator is not that good at grounding.
For some car audio that installed additional amplifier or equalizer, all these component should have a common wire that ground all of them to a same point at the body to prevent "ground looping" that may also causes whining sound.

good explanation. conclusion, the only solution is adding grounding kit.

ohh...this one. Sometimes I have them...but sometimes don't have. No idea why. But I actually like the sound lah...kinda like a jet engine when I step on the pedal

but mine already grounded but still got sound?

You grounded your alternator, and player? Are you having any amplifier?
Maybe can try to change your RCA cable to a unshieled twisted pair type if you are connecting your audio device with that.
A noise supressor capacitor also can be installed and ground it to the body.