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4.2

  1. Constant velocity axle reccomendations

    Transmission Mods
    I bought a 2003 Envoy with the 4.2 I6, with only 100k on it (score!) But as is expected with any 20 year old vehicle, some parts are worse for wear, namely the front end transmission. The first thing I'd like to do is replace the entire constant velocity axle assembly, and a stock part is fairly...
  2. 2007 Chevy Trailblazer 9.8MPG

    OEM Issues
    I got a trailblazer for my Son paid 4K total it had low mileage and looked fairly clean inside. There were a few things I knew about like New shocks, rear trailing arms i had to fix then found it needed valve cover gaskets because there was oil on the spark plug boots, then new front hubs and...
  3. 2004 4.2 Envoy Random misfire and no power

    Engine Tunes/Mods
    I have a 2004 envoy with the 4.2 I replaced the plugs and coil packs 6 months ago and it has run perfect. I went to start it up las week and it ran like crap. I put my code reader on it and got codes for the cam position sensor and the vvt actuator solenoid. I replaced both. Now I onlt get the...
  4. How to/What will I need?

    The 06-09 SS "How-To" and DIY Section
    Hey everyone! I have a 2006 Envoy, 4.2l, looking to lift. What would I need and how would I do it? Thank you! :x
  5. No crank No start

    OEM Issues
    This is the craziest issue....No crank, no start. I rebuilt the engine, re-installed. No Crank and no start. I have tested all I have thought possible. Any new suggestions would be great. Here is what was tested: - New battery - Manually triggered stater via ground signal on relay - Cranks -...
  6. 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...
  7. Where did my oil go in my 4.2?

    Engine Tunes/Mods
    I know, weird question huh? OK, here's the deal. I have a 2006 Trailblazer EXT/LT with the 4.2 engine....it's been solid for the entire 235,000 miles with not many issues at all. Since it has high miles, I frequently check the oil at least once every two weeks if not more and have the oil...
  8. [SOLVED] Towing with a 4.2i AWD Saab 9-7x

    Towing
    I have a 2006 Saab 9-7x 4.2i AWD with about 70k miles. I will be moving from Idaho to Texas in August. I am considering renting a 6x12' Uhaul trailer. The combined weight of the trailer/cargo will be right about 4,000 lbs. The Saab has a towing capacity of 4,000 lbs with 400 lbs of tongue...
  9. [SOLVED] Broken Head Bolts Solution

    The "How-To" and DIY Section
    So I have seen several posts all over about GM broken TTY bolts. I have been an auto mechanic for 20 years, most as private fleet mechanic. This is the first time I have encountered this problem with head bolts. I took the head off of a 2006 4.2 L6 because of bad valves. I tried the hammer and...
  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. 4.2 to 5.3 Swap In Progress

    Engine Tunes/Mods
    Well my 4.2 liter inline 6 threw a rod this morning and i lucked out finding a 2004 5.3 liter for 400$ with PCM and complete harness, so now its time to start the swap, I've already got a pretty good idea of everything I may need Only deal is the 5.3 came out of a pick up so I have to check my...
  12. 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...
  13. Code P0171

    OEM Issues
    Hello all. First time poster here, located in Ontario. I am no auto mechanic, but I am somewhat familiar with electrical & mechanical. I have come seeking help on a 2007 TrailBlazer LS 4.2L 4x4. 135000km. It is showing code P0171 (Lean Bank 1). Long Term Fuel Trim running 10%-28%. Also...
  14. Can you put an 04 i6 TB 4.2 in an 06?

    Engine Tunes/Mods
    New guy here. I have an 06 Trailblazer 4.2 i6 with a fried engine. I've been calling around to see who has motors at what prices so on and so forth...what I'm coming to the conclusion of is it "seems" it's all the same motor (minus some horsepower) so ultimately my question is can I put an 04 TB...
  15. Finally ordered my Gibson

    Exhaust Mods
    I've been lurking the exhaust forum for the last 2 weeks trying to decide on an exhaust for my truck. I liked the magnaflow but couldn't bring myself to spend the extra 200 (i got the stainless gibson) because I've got some work to do on the GTO. All the vids up here made the gibson seem like it...
  16. New york o2 problem

    OEM Issues
    Alright, I own a 2004 Chevy trailblazer 4x4 4200 I6. I had a clogged cat and instead of dropping the 600+ on replacing it I straight piped it. Now that dang CEL keeps coming on :hissy: Now i replaced the O2 sensor as a precautionary for further problems and used the nonfouler set up to keep the...
  17. how many miles will the 4.2 go

    OEM Issues
    Hi all, New to the group and glad I found it! I have a chance to purchase a 2002 Bravada with 140k on it. It is in really nice shape. My question is, if it has been generally cared for, how long do these engines run? Will I hit 200K, 250K? I always use synthetic, but I don't what it has...
  18. Trailvoy 4.2 injector upgrades!

    Engine Tunes/Mods
    Ok so this is for all you f/i trailvoy guys please chime in..... I was wondering what kind of injectors you guys are running? It seems that my 04 bravada uses a standard bosch style injector..... I was wondering if any one knows what kind of vehicle I can swap my puny injectors with? Iirc...
  19. Turbocharged 4.2 Project almost completed!

    Engine Tunes/Mods
    It's been a while since I've posted on here.. I figured I'd give you guys a good update.. We're almost done with the project.. just waiting on my MSD DIS-4 ignition system, and Kenne Bell Boost-a-pump. We're also going to try a JET Performance 4L60E controller. Basically, the DIS-4 will allow...
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