I can hear some whislting sound from the engine at 2-3K RPM after the car drive for a while and heat up. Suspected problem would be vaccum hose leak, do you guys agree with me or is it something else?



I am planning to do Silicon Vaccum Hose soon.

 

Sounds a lot like what happens when you take off the ACV, and don't line up the little check valve in the LIM properly when you put it back in. I can't remember the exact name, port air control, or something of the like. Is it a really high pitched whistle? Has anyone taken apart your intake before you noticed the noise?

 

Car is full stock. Haven't take off anything. There is no whistle sound when idle, but when I step on the gas, whistle sound can be heard from around 2000 RPM and above