Could it be?

[scupking]

Ok so I posted about a strange sound I was having when I started my car and that it only happens on cold days. So I have been trying to figure out what it is. I’m going to try to give a better explanation of when it makes the sound. I start the car and it idles at 1,000, then it will kick down to around 750 after about 10 seconds or so and this is when the sound starts. It doesn’t make it at 1,000 but right when it changes and goes down to 750, the whistle/whine sound starts. Also if I rev it I will hear it just for a second when I let of the gas. When the car warms up the sound is gone. I’m now thinking it could be my idle pulley, what do you guys think?

 

[Kilgore Trout]

Remove belt and inspect idler pullies, they should spin freely and easily. They are $14 at AutoZone and incredibly easy to replace.

 

[tomustang]

that is the gerbil on the wheel, there's just a little ice that has to be warmed off till his tiny legs can heat up

 

[timeless2]

Do you have any erratic idling at normal operating temp? Just wondering if the IAC is good/bad. I have heard a few whistle on their way out.

 

[OleYellarGT]

my IAC use to make a humming type noise at idle, took it out and cleaned it, the sound went away for awhile then came back. I changed it and now all is good

 

[tomustang]

that is the gerbil on the wheel, there's just a little ice that has to be warmed off till his tiny legs can heat up

 

[scupking]

Do you have any erratic idling at normal operating temp? Just wondering if the IAC is good/bad. I have heard a few whistle on their way out.

Seems to idle good at normal operating temps.