idle air control valve when it's cold

[coffee-3000]

I noticed that my car idles around 1500 rpm's when I first start it on an extremely cold day. It eventually drops down to normal (i.e. 750 rpm's).
But I thought that the idle air control valve ( i.e. IAC) is always suppose to keep the rpm's at 750 when idling. Or is this wrong ?

[pmesfun]

It's normal.

[LynchburgCSI]

Cold temps + cold engine = higher idle RPMs. It's normal.

[JohnGD]

The IAC includes a bi-metal thermostat that forces the IAC to open wider when cold. It's the way it was design. Kinda dumb I know. No other manufacturer needs to idle that fast to meet emissions.

Once the engine warms up, the bi-metal will shift into a region where it doesn't affect the ECU in controlling the IAC. Then you should see the idle stick around spec.

Originally Posted by coffee-3000

I noticed that my car idles around 1500 rpm's when I first start it on an extremely cold day. It eventually drops down to normal (i.e. 750 rpm's).
But I thought that the idle air control valve ( i.e. IAC) is always suppose to keep the rpm's at 750 when idling. Or is this wrong ?

[coffee-3000]

Thanks everyone.