EaZy DuZ iT

2004 mustang gt , 149k miles automatic.

Took the car in the past to mechanics for this sound. Either the sound didnt occur while I was there(always happens when you try to show someone a problem) or they just couldnt tell the problem.

The best way to describe the sound coming from the engine is a type of humming. It sounds like a low version of Chewbaca's famous growl (star wars lol).

It either lasts for a short time or sometimes can last up to 8-10 seconds. It always goes away. Usually when the sound starts, I give the car a little gas and it will go away.

This usual happens in the first minute of driving my car and I come to a stop or in general when I come to stops. (If I remember right its done it while crusing with my foot off the gas, low mph).

Is it possible this is a bad idle air control valve? It has been doing it for a while now.

All inputs are appreciated. Thanks !

tadpole1969

yup its possibley the iac or Chewbaca crawled in there makes sence he is in there! havent seen him since 1977 lol

VTX1800N1

These type of noises are almost always something in the air intake tract. IAC valve is not a bad place to start. Does it still have the stock intake ducting?

DeathRattle

No it can't be Chewbacca, he's dead...poor guy.

EaZy DuZ iT

The air intake tract is referring to the IAC, Plenum/TB, and intake setup right?

I put the stock intake back so yes.

I notice that on idle, if my air conditiong is on, it does it a lot. Every other 30-45 seconds. (I changed my waterbump around 12,000 miles ago).