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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. OEM Issues
    Hey guys I have an 06 ls 4.2l v6 that just passed 100k. I have my smog check coming up so I decided to give it a simple tune up. Car has been running fine so today I cleaned the TB entirely, swapped out all new spark plugs (disconnected battery throughout all this), cleaned and oiled K&N filter...
  17. Engine Tunes/Mods
    Have thoroughly cleaned the throttle body and replaced the camshaft sensor, yet it still wants to stall out when braking to a stop or sitting at idle. Also wants to choke off on acceleration. It's not throwing off any code. Need help! This site has been great in the past, hope you can help again!
  18. General
    Need suggestions! I have cleaned throttle body and replaced camshaft sensor (it was throwing out code p0340) but it still shudders and stalls out, especially when braking or accelerating from a dead stop. Is the throttle body bad? Suggestions needed. I also reset the computer after cleaning the...
  19. OEM Issues
    I have seen a lot of post about my problem but not sure how to pin point problem. I get the reduced engine power light. The engine seems to only go into reduced engine power when the gas is feathered. If I floor it and let off complety the light/engine runs normally, if I am use my cruse...
  20. General
    I can't find this particular problem anywhere. So here it is, (not that this is related but) I just replaced my water pump. Just before I replaced it I started hearing a ticking noise coming from around the throttle body. After changing the water pump,(again, I can't figure how it could be...
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