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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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Posted on Jan 02, 2017

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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.

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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 problem.at 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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