Question about 2004 Chevrolet TrailBlazer
On start up, there is a high pitched winding noise for about 30 seconds and then the winding sound startes coming back down as if it was a turbo. If you turn the engine off before the 30 seconds is up the high pitched winding noise continues to come back down even after the engine is turned off. It sounds like something up then back down after 30 seconds it is gone. After the engine is warmed up the noise can't be heard anymore even if you shut the engine off and start it back up.
Sounds like a constricted IAC Idle air control valve passsage. Fairly simple to fix. Remove air filter trunking all the way to the throttle body to allow access. The IAC allows air passed the throttle when closed at idle. Just on the inside of the throttle body in front of the throttle flap there is an opening in the throttle wall. This is the air inlet to the IAC; there is an outlet similar on the other side of the throttle. Use carb cleaner and cloth to shift the grime from this tubing and get it like new. Hold the throttle flap open to get at both ends of the IAC tubing. The IAC can be detached and cleaned to a shine. Reinstall the IAC and replace all air pipe ducting. Leave for about 20 minutes to allow any cleaner residue to dry out. When you restart you might experience a bit of uneven running but this will disappear very quickly as the last of the cleaner dries out
Posted on May 04, 2010
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Posted on Jan 02, 2017
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