Question about 2006 Chevrolet Trailblazer

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Throttle relearn video you tube - 2006 Chevrolet Trailblazer

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Simply disconnect both battery terminals after installation of the replacement Throttle body. Hold the two battery terminals together for 1 minute, then reconnect the battery terminals to the battery. Be advised that use of aftermarket throttle body parts may cause the fault code to stay in memory, due to non standard electronics in them. If the throttle position sensors fail [part of the throttle pedal assembly] the fault code may still stay in memory. I've had a number of GM trucks which required replacement of both the throttle pedal assembly & throttle body assembly to correct the fault. The vast majority of aftermarket parts are now made in China or the third world. Quality control on these items is almost non-existent. It is very hard to find top quality aftermarket parts now. Engine sensors, electronic controls and engine mounts are three areas where I now use only dealer supplied parts. I've had to many headaches and wasted time dealing with defective aftermarket parts.

Posted on Sep 07, 2014


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How do I do a throttle body replacement relearn on a 04 isuzu ascender

The relearn is done by unhooking the battery for 30-60 minutes. With all HVAC OFF, hook the battery back up and drive your Ascender around for about 40 min or so, at this time, it will relearn. To test it, stop the vehicle put it in park and turn your AC on, if your car doesn't show signs of boggin down or trying to die on you, your relearn was done correctly. This is all assuming that your throttle body is CLEAN!!! If it's not clean, your idle will be bad and engine will try and die on you at idle when your AC or Defroster are on. Relearn should of already been done---> you always disconnect the battery when cleaning the throttle body, as to not to damage the stepper motor that moves the butterfly. To properly clean the throttle body and for best results, always remove the entire throttle body and clean BOTH sides with a sensor safe spray like Seafoam and a rag or nylon brush, you can reuse the hard plastic gasket. Hope this helps!

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I just finished fixing my 2005 Envoy with the same problem. Your problem is most likely a dirty throttle body. If you take it to a shop they are going to want to replace it for about $500. If you clean it, you can usually fix it for less than 10. There are a couple of good videos on youtube about removing and cleaning the throttle body. Some say not to touch the butterfly inside, but you can also pull the fuses for the fuel system, or do an idle relearn procedure after you clean the throttle body so the vehicle will run properly. Basically, you can clean the throttle body with throttle body cleaner after removing the unit from the intake manifold. You will need a flat-head screw driver, a 10 mm socket with an extension to remove the vortec cover/box that covers most of the engine. There is a wire attached to the left rear corner of the box and an evap hose attached to the front left corner of the box. Then you remove the plug on the throttle body, the fuel line and four mounting bolts and the throttle body comes off. Don't use anything abrasive to clean the part--just throttle body cleaner. Also Don't drop the part. These seem to be rather delicate and using abrasives or dropping the unit will damage the coating on the inside of the throttle body. I do recommend watching the videos.

After cleaning the unit, you may need to do a throttle relearn procedure for the system to reset. look these instructions up online or call a GM dealer. You may also need to clear fault codes while driving the vehicle for the relearn procedure. It took about 20-25 minutes to remove and clean the throttle body, about 15 to reinstall it, and then 200 miles to reset the OBDII codes on the computer. My vehicle also has a faulty fuel guage wich made completing the OBD tests take longer than usual. The repair is pretty straight forward--by no means worth over $500 at a garage!!

Good luck, I hope this helps

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