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  1. Rattling noise (not piston slap)

    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...
  2. The stupid reason why the Trailblazer was perfect for me

    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...
  3. Engine harness plug

    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...
  4. 2006 Chevy Trailblazer engine swap

    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...
  5. Possible to put Silverado 5300 Vortec Cover in Trailblazer?

    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...
  6. Large/Fast Coolant Leak - after replacing thermostat and water pump

    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...
  7. 2002 TB EXT LTZ 182,500miles 277oil life CODE P0014

    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...
  8. '03 Trailblazer Shaking Engine !?!

    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...
  9. Need advice please! Any opinion will help

    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...
  10. Pcm4less tune - worth it? Imho

    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...
  11. [SOLVED] 03 Trailblazer Engine Light Flash

    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...
  12. Engine knocking fixed with SeaFoam then came back

    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...
  13. 4.2 engine rebuild

    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...
  14. Rpm is weird maybe the engine?

    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...
  15. Automechanic couldn't figure this out. Maybe you can. Tranny issue?

    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...
  16. [SOLVED] JET Engine Noise

    General
    My 2007 SS Trailblazer started making a jet engine noise that gets louder as you accelerate, I had the front brakes changed so it's not the brakes :confused:
  17. Shaking horribly

    OEM Issues
    [SOLVED] Shaking horribly Hey guys, I have an 04' TB with 165,000 miles on it. I tuned it up this weekend, spark plugs, boots, cleaned camshaft actuator solenoid and all that. it was running like a new one for about a week. I went to the store yesterday, got back into my car put it in reverse...
  18. Engine replacement for '05 Envoy XL SLT V8

    OEM Issues
    I have a '05 Envoy XL SLT V8 5.3l and now I am getting a clunking sound when the engine revs up as well as can stall while ideling. My oil pressure is also low and rises when engine is engaged. From what I gather it is most likely the rod / bearing? My mechanic said all new engine and would be...
  19. Trouble Starting after fill-up

    OEM Issues
    Hi Guys, I've been having some trouble for a while now. Each time I fill my tank, i hop in the car and turn the key to start it. The engine starts, but it sounds like the system chokes on the fuel and there a sounds almost like the starter out of sync. Each time after that it starts perfectly...
  20. Oil on plug thread?

    OEM Issues
    Hey everyone! I've been stalking this forum for about a month now since buying a 2004 Trailblazer LS. There is a TON of awesome info on just about anything I need, and even a bunch of videos. I used several of these resources to change my spark plugs and clean the throttle body at about 91,500...
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