Throttle Body/ Throttle Position Sensor Problem - 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 5.3L V8 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 08-30-2011, 06:09 PM
doctorlingling doctorlingling is offline
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2002 Chevy TrailBlazer LTZ
Cranberry Red Metallic 4.2L I6 4X4
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Location: Syracuse, NY
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Throttle Body/ Throttle Position Sensor Problem

Hello, I have a 2002 trailblazer LTZ, I just cleaned the throttle body on it, and when I had it off, while rotating it to clean various places, there was a rattling noise comming from the inside. I put installed it back in the TB, and it worked for a few days, But now I have the Reduced Engine power light, and SES light, and when I put the key to the on position, there is a nasty rattling noise comming from the Throttle Body itself. As far as I can tell, the Throttlebody and Throttle position sensor are one sealed unit and must be replaced as a whole, is this correct? And lastly I called around and the nearest Chevy dealership told me that the PCM needs to be reset or the idle will be off. Any truth to this? Any information is of great help, as I trust your responses way more than the stealership. Thank you for the help in advance! - Jim
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  #2  
Old 08-30-2011, 06:14 PM
the roadie's Avatar
the roadie the roadie is offline
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You need a new one, but you can get it cheaper from Rockauto or parts4chevys.com or Ebay or Amazon.

The dealer lies. The PCM will figure out how to deal with the new one within a half hour of starting to drive around, as long as you disconnect the PCM fuse or the battery altogether while you swap the throttle body. Same way it relearns the behavior of a clean throttle body after cleaning it.
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  #3  
Old 08-30-2011, 06:31 PM
doctorlingling doctorlingling is offline
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2002 Chevy TrailBlazer LTZ
Cranberry Red Metallic 4.2L I6 4X4
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Hey thanks for the reply- This site is my Trailblazer bible- one last question regarding my TCCM- Mine is in sleep mode- but my question is will ANY year from 2003 and up be swappable and not need reprogramming?
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  #4  
Old 08-30-2011, 06:43 PM
the roadie's Avatar
the roadie the roadie is offline
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Quote:
Originally Posted by doctorlingling View Post
... regarding my TCCM- Mine is in sleep mode- but my question is will ANY year from 2003 and up be swappable and not need reprogramming?
Yes, as long as it's from a 4WD model (trailblazer, envoy, or one of the other "odd" ones I always forget) and not an AWD model.

For the best performance in A4WD mode, you should have one with the same differential gear ratio as yours, but since I recommend almost NEVER using A4WD mode on pre-2005 transfer cases, unless you're in very specific changing traction conditions where it may be better than 4HI mode, the gear ratio programming is irrelevant. Many drivers use A4WD mode in rain where it's not necessary unless they're punching it and generating lots of wheel spin which is insane.

Quote:
...This site is my Trailblazer bible...
I've actually heard that before, and photoshopped this up as the source of most of MY knowledge.

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