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  1. General
    Hello everyone. Im gonna try to be concise here, but I have a tendency to ramble so bear with me. I am rebuilding my truck. 2002 TB LTZ. I wanted to upgrade to an 07+ tahoe, but I have no interest in paying over 10k for a car from 2010 right now. So my trailblazer with 220k on it is going to...
  2. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    I’ve seen a few threads but can’t find a solid answer. My 2005 trailblazer engine is bad, no compression after over heating the crap out of it on the way to Las Vegas in 117 degree heat. Now I’m looking to swap it out but the only engine I can find locally is a 2004. Will that work? Anything I...
  3. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Hi everyone I had recently found out someone took my oil pan off my trailblazer so the old lady drove it and it blew up. I am wondering what engines I can put in it and what else I will be needing for the swap. 2005 trailblazer ext 4.2 straight six
  4. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
  5. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Hi everyone! This is my first post here, so forgive me if this the wrong section. I have a somewhat bizarre issue and thought I would see if anyone has any ideas. I have a 06' LS 4wd with the 4.2. A few months back, I replaced the fuel pump as the sender unit went out, and after about a week...
  6. 02-09 General Tech Q&A
    My trailblazer makes a loud rattling noise that sounds like a dancing gear or a dancing belt hitting something/rubbing on something. It's coming from the very front of the valve cover, the truck runs fine and doesn't have any issues, it just makes a concerning noise. Note: I'm running it with...
  7. General
    I've been jumping around this forum for a bit, so I figured I should share my story and why I ended up seeking out a Trailblazer. Basically, I spent two years working as a mechanic in a shop and fell in love with the profession. I ended up going back to school, but I wanted to continue learning...
  8. General
    Hello all, New to this site and to say it has been super helpful is quite an understatement. I did some work on my TB (new valves, timing chain, water pump, etc.) and had to unplug most of the wiring harness in order to get this done. I have put it back together and I am stuck on this plug (see...
  9. Engine Tunes/Mods
    I am new to posting on this forum, but I was looking to see if anyone else has ever swapped a 2006 4.2 Trailblazer motor with a 2007 4.2 Trailblazer motor? I have seen throughout the internet, where other people have swapped them without any difficulties. I just wanted to make sure that I...
  10. Engine Tunes/Mods
    Hey lads, just recently got my first trailblazer I plan on turning into an offroad God. Want to know if it's possible to slap a Silverado 1500 or similar engine cover, seeing as it looks sort of bland when you open the hood. A mundane thing I know, but, I'm one that likes to take pride in the...
  11. OEM Issues
    I recently expietenced a cooling system failure on my way back to work on lunch break. My engine temp spiked and my engine alarms started going off. Luckily I was really close to my work. I was able to get it to the parking lot, opened up the hood and coolant was spraying/leaking everywhere. It...
  12. OEM Issues
    Got car used from Jake Sweeney back in July. Car makes whining noise maybe belt issue. 182,500 miles on car. 4.2 v6. 27 percent oil life. Just got a Hum from Verizon (kinda like onstar) put reader in the OD spot. Popped up code P0014. And for first time SERVICE ENGINE LIGHT CAME ON. Car...
  13. General
    Engine rocking (literally) more than usual. Just started during bad weather. The movement of the engine actually makes the vehicle rock back and forth. Especially noticeable in gear at idle (low) speed. Less noticeable at higher speeds. Also, engine seems to be low powered, not as much pick up...
  14. General
    I have an '06 Envoy Denali with the 5.3L Vortec V8 and about 6 months ago the engine seized up and I had a rebuilt one put in. There is a 100k warranty on it but now it shifts into 2nd weird.. Almost like it hesitates. The truck has around 140,000 on it and I was wondering what you all think I...
  15. Engine Tunes/Mods
    Hi everyone, Before you get offended from what I am going to say, I'm not trying to put out a bad review to PCM4LESS, and there are many threads on here praising them, in which people have LOVED their tuned PCM's. I just recently installed my tuned PCM from them and wasn't too impressed...
  16. The "How-To" and DIY Section
    I have researched it up, and I've found several accounts of what it could be. The most common that seems to be popping up is the throttle body is dirty needs to be cleaned. But there is another one with a coil? I have attempted to research how to fix that, but I cannot find anything about it...
  17. General
    I need some help. I thought I fixed the knocking issue but it has come back. I was towing our travel trailer back to the storage unit with the gas light on. Just before I got to the gas station the engine started knocking. I filled up and the knocking continued. I got home and checked all...
  18. Engine Tunes/Mods
    I am currently in the process of doing a rebuild on my 02 4200. This is the first overhaul i have done on this engine family, but definitely not my first engine build. Are there any tips or tricks to look out for? Any info on setting the timing back up, setting up the valve train, or a page...
  19. OEM Issues
    Hello all im kind of new to the forum so sorry if i do something wrong. But i have done countless research on this and cant seem to find an answer :worried: I have a 2004 chevy trailblazer lt 6 cyl So when i start the truck it seems to rev up to around 1300 rpm and as i let it warmup it idles...
  20. OEM Issues
    I recently bought a 2006 Envoy Denali. Love the car, and everything is great, except... When in drive at a stop, or in park, there are these occasional (very) minor jolts, nothing heavy, but enough that it annoys me and something is just not quite right. It feels almost as if the gears are...
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