Helloo!

Owner of "Lagi Best" MyVi eZi.

I discover one sound coming out from some where but I can't be sure where. It is a very consistent sound and it can be reproduce in the following scenario:

1 Turned off the engine and let it be for around 2 to 3 minutes or more..
2 Ignite. Then drive it and speed up.
3 Once it hit 20kmph, I will hear one distinct sound like "tark...".
4 Stop at red light, drive up to 20kmph the sound is not there.

For the rest of the journey the sound won't come. It will only come if I turned off the engine. Regardless how long I turned it off, and whether I will get down from my car or not, the noise will come once it hit 20kmph the first time...

I sent to Perodua to inspect, and they told me they don't know anything about it and don't know where it comes from...nor can they solve my problem.

What to do? Please help me!