| OEM Issues Original Equipment Repairs and/or Problems |
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10-13-2008, 03:47 PM
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Junior Member
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2003 Chevy TrailBlazer LT
Pewter Metallic 4.2L I6 4X4
Join Date: Dec 2007
Location: Bethlehem,PA
Posts: 6
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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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10-13-2008, 08:40 PM
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TrailVoy Alumni
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2002 Olds Bravada
Pewter Metallic 4.2L I6 AWD
Join Date: Nov 2007
Location: Schaumburg, IL
Posts: 2,369
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did you disconnect the battery while you were cleaning it?
__________________
2002 Oldsmobile Bravada: 4.2L I6 w/ G80 Locker, AWD, TBSS springs, HD bilsteins, 6000k HIDs, Mobil1, Iridium Plugs
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10-13-2008, 09:39 PM
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Member
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2005 Chevy TrailBlazer LT
Dark Gray Metallic 4.2L I6 4X4
Join Date: Dec 2005
Location: Boston, MA Area
Posts: 354
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There is a stepper motor.
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10-14-2008, 02:23 AM
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Junior Member
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2003 Chevy TrailBlazer LT
Pewter Metallic 4.2L I6 4X4
Join Date: Dec 2007
Location: Bethlehem,PA
Posts: 6
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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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10-14-2008, 07:02 AM
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Western Canada Chapter
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2003 TrailBlazer and '09 Kadillak Eskalade __
sExY Dark Gray Metalic 4.2L I6 4X4
Join Date: May 2006
Location: Vancouver BC
Posts: 6,407
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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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 Bill
trailvoy.com
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10-14-2008, 01:36 PM
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TrailVoy Guru
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2003 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Sep 2004
Location: west covina
Posts: 5,267
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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.
__________________
2013 Equinox-3.6L DI- Best MPG 35
2010 Traverse-3.6L DI Best MPG 31.3
2003 Trailblazer LS 165,000 miles- Best MPG 24
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10-14-2008, 05:10 PM
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Member
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2003 Chevy TrailBlazer LT
Emerald Jewel Metallic 4.2L I6 2WD
Join Date: Sep 2007
Location: Mexico City
Posts: 232
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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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Bilstein HD, K&N CAI 57 with gutted air box, Alpine IVA-W205 HU GT5-4.10 gears G80, 6000°K HID Lows and Fog, PCMForLess,
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10-14-2008, 05:49 PM
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TrailVoy Alumni
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2002 Olds Bravada
Pewter Metallic 4.2L I6 AWD
Join Date: Nov 2007
Location: Schaumburg, IL
Posts: 2,369
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 disconnect the battery for about 30 minutes to an hour and see if it helps. it should.
__________________
2002 Oldsmobile Bravada: 4.2L I6 w/ G80 Locker, AWD, TBSS springs, HD bilsteins, 6000k HIDs, Mobil1, Iridium Plugs
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10-14-2008, 10:03 PM
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Member
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2004 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
Join Date: Aug 2008
Location: Texas
Posts: 142
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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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10-15-2008, 11:59 AM
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Junior Member
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2008 Chevy TrailBlazer LT
Dk Brahma Jewel Metallic 4.2L I6 2WD
Join Date: Sep 2008
Location: Lawrenceville, GA
Posts: 69
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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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