What causes a cars engine to whistle as rpms go up?

Question

well it could be the iac since my rpms stay around 2000rpm until engine heats up

Answer 1

Probably a vacuum leak. Likely caused by a bad gasket.

Answer 2

It depends of the brand and year of the car. It may be the belt, sometimes the carburator adjuster and sometimes the probles is the calister.

good luck!

Answer 3

....idle air control leaking...or some other form of vacuum leak, check all your vacuum hoses and iac motor

Answer 4

could be your belts are too loose. or not properly lubricated.

Answer 5

if your car is turbocharged, it sounds as if you have a charge air leak.  when the turbo builds boost pressure, it is leaking.  check hoses and clamps from turbo to intake manifold.

Answer 6

heck, maybe it's just happy.

Answer 7

I have a turbo charged car, and the turbo or the super charger spooling makes a whistle sound. Depends on your car...

Answer 8

Lots of different things, you need to tell us what type of car you have and somewhat where the whistling is coming from for us to even diagnose anything...