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  1. OEM Issues
    I have an '02 Envoy, run into a stream of issues back to back ended up fixing it all. Then much to my dismay I got a throttle issue where it doesn't idle anymore. The engine also refuses to open the throttle at all, even when flooring it. Takes a solid 40 seconds to get to 30 mph. Replaced the...
  2. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    2004 Trailblazer LS EXT with 4.2L Ok, went to Walmart and noticed the Trailblazer is idling high. Show's about 1K on dash, but Torque Pro say it's about 900. Also, it seems like the gas mileage was noticeably less. For better or worse when the original Throttle Body gave out recently I...
  3. OEM Issues
    A couple days ago I got off work and went to start my 2005 Envoy, it fired once then shut off. After this the reduced power mode light came on and it would crank but wouldn't fire. After putting it on a trailer and bringing it back home I put a scan tool on it and came up with a couple codes...
  4. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    2004 Envoy, 4.2, 205k miles, rust belt yummies. My AC compressor bearing has been making noise for over a year and finally seized up. Luckily it's not my daily driver and this happened while it sat for about a week in the driveway. Went to start it and the belt snapped. It was overdue for...
  5. 2013+ Chevrolet Trailblazer Forum
    Got in my 2003 Envoy XL yesterday and when I started it the ABS light and the Parking brake light both came on (not sure it has anything to do with the other issue, but it may). I put it into drive and pulled out of the driveway. As I went to accelerate the RPMs went up to 4000 but the truck...
  6. OEM Issues
    2005 GMC Envoy 4.2 I6 Codes: P0526/P0410/P0442/P0014 Having issue where at 50-60 mph range and trying to maintain speed in that range (holding accelerator steady) the engine seems to buck or jerk. Uphill, down, flat road doesn't matter. Let off gas goes away, give it more gas, goes away...
  7. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    I got the code P1221 a while back. I cleaned the TB and reset the PCM. I drove maybe 30 minutes. I rarely drive this more than 15 minutes at a time as it is not my daily driver. Things were good for a out 4 or 5 months. Then same code. I bought a new TB and replaced the old. Reset everything...
  8. Air Induction
    Hello, I'm a new owner of a 2005 Trailblazer 4.2L. Shortly after purchasing the vehicle I had trouble with the throttle body. Replaced it and it's running pretty good now. I do notice a bit of a rough idle here and there but generally pretty good. Which makes me want to buy the best throttle...
  9. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Few days ago I got the P0510 code “closed throttle position switch” on my 03 TB 4.2 with 102K km (63K miles) I already had plans to clean the throttle body before summer so I’m going to do that now and hope it will solve the problem and I wont have to buy a new throttle body. In the last few...
  10. OEM Issues
    I have a 2002 Chevy Trailblazer. I have been having problems with losing power (reduce engine power light). Most the time I can Just pull over kill it and it will go away and then go on. Sometimes if I leave the A/C off when I stop at a stop sign or red light it will not do it but sometimes it...
  11. General
    Hi! My trailblazer has codes P0506, P0128, P0014. Main issues with it are it idles a bit rough/low. Sometimes I have to pump the gas to get the vehicle to start up. while I was driving the other day it all of a sudden just turned off? Hasn’t done it since. So far we’ve replaced the battery...
  12. Air Induction
    Hello, new to this forum but it looks fairly active and maybe someone can help. I recently decided to spend money upgrading my 2008 Trailblazer LT, and I bought a K and N air intake and throttle body spacer. I put both in with some help from a friend, but now my check engine light won’t go away...
  13. OEM Issues
    Howdy y'all! I had posted a question a while back and never got a reply. However, I remember looking through quite a few threads with similar issues without any solutions either. I just figured mine out. This was one of the dumber reasons for a problem. Basically, after swapping in a new motor...
  14. General
    I recently have been having the high idle issue. Come to find out, the FPR hose was not connected to the resonator. I connected the FPR hose to the resonator and disconnected/connected the throttle body plug. The high idle issue was solved and the check engine light disappeared. I decided to...
  15. Introductions
    Hi, I have used the site in the past and it helped out a lot. I drive a 2004 Envoy 4.2L. Located in Westchester County NY. Having an issue with code P2138 and want to make sure if it is the pedal or the throttle body or what. Reduce Power light on after I start the car. Gas pedal works for one...
  16. General
    Hey there new to the site. If anyone could give me some input I'd greatly appreciate it. I've had some problems lately I believe can be attributed to a dirty throttle body. Poor gas mileage, poor idle when engine is cold. Even had a few codes a while back (they disappeared later that day) that...
  17. OEM Issues
    OK, so I've been dealing with this for quite some time now. Unfortunately, now I need to have my TB inspected and the check engine light won't go away. I've cleaned the MAF and the throttle body and still need to clean out the air filter, which is K&N. The P0506 code has been on here and...
  18. Air Induction
    Hey guys, I have been scouring this site for a couple weeks now trying to find a solution. First off, I have 99k miles on my 05 TB. Let me give you a walk through with my issue: Vehicle was running great, but I was approaching 100k miles so I decided to swap the spark plugs with the AC-Delco...
  19. General
    Please Help! 03 Trailblazer with 112,000 miles shutting off when coming to a stop and check engine light is on. Over the past few years I noticed my car would shut off when coming to a stop but it was only happened maybe 3 times a year. Just last week it started doing it about once a day and my...
  20. Audio and Electronics
    I have an 02 Trailblazer and about 3-4 weeks ago I installed a brand new Pioneer FH-X700BT head unit with a GMOS-1 wiring harness. Everything was in working order and sounding great. I was recently having some fluctuation in my RPMs from a cold start so I thought it would be helpful to clean...
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