Idle high/ Cleaning throttle body - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 10-13-2008, 03:47 PM
Tims SS Tims SS is offline
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2003 Chevy TrailBlazer LT
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Idle high/ Cleaning throttle body

My 03 Trailblazer I6 seems to hang the idle up about 1500 rpms then comes down. I've cleaned the throttle body. Is there an IAC motor that controls the idle. I can feel it hang up with my foot off the gas and it seems to be going by itself while in drive. I shift into neutral and the idle hangs up at 1500 then takes its time coming back down. Any suggestions?
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  #2  
Old 10-13-2008, 08:40 PM
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wardak33 wardak33 is offline
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did you disconnect the battery while you were cleaning it?
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  #3  
Old 10-13-2008, 09:39 PM
Elevatorguy Elevatorguy is offline
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There is a stepper motor.
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  #4  
Old 10-14-2008, 02:23 AM
Tims SS Tims SS is offline
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No, I did not disconnect the battery while cleaning it. The idle problem existed before I cleaned it.
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  #5  
Old 10-14-2008, 07:02 AM
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Blazernut Blazernut is offline
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The battery must be disconnected in order to reset the PCM.

Hopefully you removed the throttle body for the cleaning process in order to get the backside of the throttle plate 100% clean.
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  #6  
Old 10-14-2008, 01:36 PM
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hopefully you also cleaned the throttle body with the KEYS OFF (ignition not on).
these stepper motors do not like to be moved when power is applied-
you can damage it.
the stepper motors circuit senses the movement youre giving it- and tries to counteract it--- if you force it-- damage can occur.

So thats why its recommended that you leave the keys out of the ignition- (since many people want to turn on their radio)...
and so disconnecting the battery for 30+ minutes also clears memory and throttle body can relearn new parameters with clean throttle body.
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Old 10-14-2008, 05:10 PM
stanley2 stanley2 is offline
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I was told by a member that to reset the idle you should disconnect the battery for 30 min, reconnect and start the engine with out touching the accelerator until it idle at around 600rpms, then turn it off, for the next start is should be working Ok.

Hope it works for you!
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Old 10-14-2008, 05:49 PM
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wardak33 wardak33 is offline
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disconnect the battery for about 30 minutes to an hour and see if it helps. it should.
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  #9  
Old 10-14-2008, 10:03 PM
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Disconnect the battery, THEN REMOVE the throttle body, THEN clean it. I started by just cleaning the throttle body with it on the truck, then I decided to just remove it and clean everything. I MISSED SOOO MUCH when cleaning it on the truck, plus I noticed that I pushed a lot of dirt thru the throttle body into intake manifold. I'm so glade I caught that!!! I almost maid things so much worse.
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  #10  
Old 10-15-2008, 11:59 AM
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Disconnect the battery, mine did the exact same thing when I removed the TB to clean. I disconnected the battery for a bit, reconnected and blango all better.
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