[SOLVED] Trailblazer stalls at idle when defrost or A/C turns on

[jdinjersey]

I read many threads related to the stalling and mostly all replies focused on a dirty throttle body. My 04 Envoy started stalling when defrost was turned on a week ago. Pretty dangerous condition when stopped at a light.

Given the how to instructions on this site, it seemed like a job I could handle myself. Figuiring that I have to take most of the breathers and other apparatus off already to get to the throttle body, I thought it was time to do the plugs also.

OK, after 100K miles, and never had the throttle body cleaned with original plugs I found perfectly laid out instructions on this site. Easy to read, great pictures, and good examples of the typical issues that you need to be aware of when taking the apparatus off.

The throttle body was like it had baked on carbon. It was a shocker. Plugs still had the tips. Everything I read on Trailvoy talked about AC/Delco Iridiums, as the other plug manufacturers seemed to have problems a few thousand miles later.

Yep, back plug was a b*tch to get out, and I placed a 1/4" hose to get the plug out after loosing it up first with the wratchet. Same hose used to install the plug without damaging the threads too. Anti-seeze was used as instucted.

The Envoy darn near purs like new and no cut out when defroster is turned on.

I am one happy camper and glad to have found this site. Saved me a bundle also by doing the job myself.

[ables]

mine was doing the same thing and cleaned the tb and she runs like a champ, thanks for all the info

[screener]

Originally Posted by bvad02

it is most likely just a dirty throttle body. follow this how to and should clear up your problem.
http://forums.trailvoy.com/articles....ticle&artid=91

tried this yesterday and the results were excellent. thanks for the tip, the wife is going to have to find something else to nag about now that the a/c is working again. thanks, glennnnn

[thekriegers]

Thank you for the excellent description and step by step photos. They all worked like a charm and more importantly my Trailblazer does not stall with the ac on and all for only $4.19

Thanks again!!

[SSoltesz]

I just wanted to thank this website and the responses that everyone writes. I have trying to figure out why my 2004 GMC Envoy was bogging down and stalling. A mechanic at Meinike said it may be the throttle body and stated that it would 300.00 to replace it. Another mechanic said it was the ac compressor that was bad and that I needed a new one at the cost of 500 to 600 dollars to replace with a new one. Another mechanic had no idea what was going on. After reading these threads, I took it upon myself to get a can of throttle body cleaner on my way to my family reunion and see if I could clean it out. I had the TB taken out, cleaned, and put back in within an hour. Completely fixed the problem! Thanks a million (or at least 300). I will definitely check this site out before taking it to a mechanic.

[Voytrail]

I have a 2002 TB LTZ in which for the past six months was dropping RPM and stalling once a day-- from a cold start. After a quick search on the Internet I did the followings:
1- Cleaned the Throttle
2- Had the throttle body under vacuum test over night
3- Changed the gas filter
4- Changed the air intake sensor

Guess what , I did all of the above to no avail.
For the past two weeks, the RPM drops and stalls were occurring every five minutes at all times. I was freaking out and fuming. After taking it to a garage the guy visually found the culprit. It was the exhaust cam shaft solenoid, which was leaking oil. I hope you learn from my experience.

[soric23]

I just had this problem,,, NOTICE HAD!!

This site is awesome thanks for all the info you guys provide, I was able to remove,clean and reinstall the throttle body in about 45 mins...

[04ChevyTbLs]

Had the same issue awhile back during august 2012. Cleaned out the carb/build up inside the throttle body. Found a video on youtube on how to clean the throttle body! Save me money on DIY! So far no problem and driving strong 8,000+ miles with no issue!

[cjmartinusn79]

Had the Same issue after disconnecting the battery cleaned the gunk out of the throttle body and is running awesome. Thanks this forum is the best.