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2004 Trailblazer where is the IAC located - 2004 Chevrolet TrailBlazer

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Doesn't have one. We have an Electronic Throttle Control or ECT. The idle air control is controlled by your PCM and throttle body, so there isn't a valve. What's the problem or what problems are you experiencing? Chances are it's a dirty throttle body.

Posted on Mar 25, 2011

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Sounds like a dirty throttlebody plate or your electric accelerater assembly is going bad. Clean plate a retest, if it happens more ofter you should replace the gas pedal assembley and the throttlebody assembly.

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I need to know were the IAC valve is

For a new Body style 2004 ( not a Heritage or Lightning ) there is not an IAC.

The IAC functions are now part of the throttle by wire operation in the 2004-08 MY F-150s.
The Throttle Plate Position Controller is part opened by the PCM ( actually a chip embedded in the PCM specific to this function ) when the engine is at idle and the throttle is off ( i.e. not be pressed down ).

If you are talking about a 2004 Heritage or Lightning ( the same body style as the 99-03 MY ), the IAC is on the back of the throttle body, under the plastic throttle body cover.


Not too sure which 2004 version you are talking about, just wanted to cover both 2004 options for the location on the IAC.

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This sounds like an IAC idle the iac controls the air flow through the throttle body.try a good throttle body cleaning and dont forget to clean the iac too.

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