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  1. #21
    Jr. Mechanic djthumper's Avatar
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    Thanks Steve.

    Here is a pic of a bumper that I am looking at buying. He basically custom builds them in his shop at home. He does them for a 3" body lift also. Here is his facebook page for the fabrication http://www.facebook.com/MDBFAB
    2006 Trailblazer 4X4, 2.5" lift, Z71 rear springs, Skyjacker rear shocks
    Larry- KC7QJO

  2. #22

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    I would like to know if anyone has any experience changing spark plugs on the Trailblazer Vortec I-6? I have 122K miles on my '05. It still runs like new, i.e., perfect. I have replaced the air filter regularly, changed oil/filter regularly, and pulled the belt off it once to replace a whining idler pulley that cost $17. This is ALL I have done to it since it was brand new. It still has the original battery. I'm a little scared of changing the plugs or even working on it. I don't even like to let mechanics near it if possible. I don't want them messing it up. Once already, one of these hammer mechanics left a screw loose on the air filter holder. There's only 3 and one is kind of hard to get to. Just to change tires nowadays they want to sell you an air filter or ??? so it's hard to keep these people away from it so they don't do damage. I'm not at all familiar with a spark plug/coil set-up. I think it's a great idea but I don't want to F it up and I know these platinum plugs don't last forever. I'm thinking of running to 150K if it makes it without starting to miss or run poorly, then I will either change them myself or maybe allow the dealer to do it. Any thoughts? On how to do this?

  3. #23
    Jr. Mechanic djthumper's Avatar
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    Quote Originally Posted by trailblazer58 View Post
    I would like to know if anyone has any experience changing spark plugs on the Trailblazer Vortec I-6? I have 122K miles on my '05. It still runs like new, i.e., perfect. I have replaced the air filter regularly, changed oil/filter regularly, and pulled the belt off it once to replace a whining idler pulley that cost $17. This is ALL I have done to it since it was brand new. It still has the original battery. I'm a little scared of changing the plugs or even working on it. I don't even like to let mechanics near it if possible. I don't want them messing it up. Once already, one of these hammer mechanics left a screw loose on the air filter holder. There's only 3 and one is kind of hard to get to. Just to change tires nowadays they want to sell you an air filter or ??? so it's hard to keep these people away from it so they don't do damage. I'm not at all familiar with a spark plug/coil set-up. I think it's a great idea but I don't want to F it up and I know these platinum plugs don't last forever. I'm thinking of running to 150K if it makes it without starting to miss or run poorly, then I will either change them myself or maybe allow the dealer to do it. Any thoughts? On how to do this?
    It is recommended to replace the plugs at 100K. Here is a video on how to replace them

  4. #24

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    More information - In doing some on-line research I found this photo of the Atlas LL8 (Vortec I-6)




    I still can't tell where the spark plugs are. Obviously they must be up on the "top" of the engine somewhere.

    Too bad this engine has been discontinued. It was a big reason I decided to buy my Trailblazer and I've never regretted it. The engine is really so much more high tech compared to anything else I've ever owned. Here's some interesting stuff from Wikipedia:


    Atlas is a name for a family of modern inline piston engines for trucks from General Motors. The series debuted in 2002 with the Oldsmobile Bravada, and is also used in the Chevrolet TrailBlazer and Colorado and their GMC twins, the Envoy and Canyon. In production, the engines use GM's Vortec name, and I4, I5, and I6 engines are all part of the same family, sharing the same manufacturing equipment, rods, pistons, valves, and other parts. They feature variable valve timing on the exhaust side, electronic throttle control, and a special oil pan with a pass-through for the half shafts in four-wheel drive vehicles. The inclusion of VVT on the exhaust camshaft side allows the Atlas series to meet emissions standards without the use of EGR, simplifying the engine design and increasing power for a broad power curve.

    The Atlas program began in 1995 along with the planning for GM's next-generation mid-size SUVs and pickup trucks. These vehicles were designed around the I6 engine. The I6 version was used in a Baja 2000 racing truck, winning its first race in a class that also included V8 engines. Another I6-powered truck won the truck class at the Pikes Peak International Hillclimb.

    The I6 Atlas engines were produced at the Flint Engine South plant in Flint, Michigan, while the I4 and I5 versions are currently produced at the Tonawanda Engine plant in Tonawanda, New York.

    The LL8 (or Vortec 4200), is a straight-6 truck engine. It was the first Atlas engine, and was designed for GM's new SUV line. It displaces 4.2 L (4160 cc, 254 cu in),[1] with a 93 mm (3.7 in) bore and 102 mm (4.0 in) stroke. When introduced, this engine's power was 270 hp (205 kW) at 6000 rpm and torque was 275 ftlbf (373 Nm) at 3600 RPM. 2003 saw a slight bump in power to 275 hp (205 kW), while torque was unchanged. For 2006, power was increased to 291 hp (217 kW) at 6000 rpm and torque to 277 ftlbf (376 Nm) at 4800 rpm with the addition of a MAF and a complete internal redesign of the engine. The Atlas LL8 was on the Ward's 10 Best Engines list for 2002 through 2005. Engine redline is 6300 rpm.
    LL8 Applications:
    With the closing of the Moraine, OH plant and the termination of the GMT-360 platform (Chevrolet TrailBlazer, GMC Envoy, etc) the Atlas LL8 (Vortec 4200) has also been terminated. The smaller I4 and I5 variants are still produced.

    No question that the constant lies told by the US Lame stream media about what "junk" American cars are, and how imports are "fantastic" had a lot of influence on the future of this engine.

    Remember this one? "American Car companies just aren't producing the kind of cars Americans want to buy." Well, yeah I guess they must not be because you keep telling us this contantly every other sentence that dribbles from your mouth. We get brain washed after a while. I started thinking "How in the world can someone not find a vehicle they like out of thousands of models to choose from, with every option conceivable one could think of?" Then I realized it's just an unwarranted attack by jealous individuals in our media who are against those "evil rich corporations" especially the American ones. A lot of the left over 60s anti-establishment hippies who did not become college professors must have ended up in journalism where they could vent their anger against American capitalism in support of their favorite communism agenda. Now that GM has been transformed into a socialist entity suddenly the Lame Stream media is acting like they are "making good cars again" I notice. It's such BS.

  5. #25

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    Thanks a lot for that. That was a great video. Now I will know how.

    Previously, All I found was some lame 6 step process that started with "remove spark plug wires". Just what I needed - generic spark plug removal instructions, not...

    I have another reason I think maybe I can go to 150K. My first reason is plugs I've seen at 100K which were not "worn out" when I pulled them. Today I read on some sight that some plugs can go as much as 200K, but they could have been iridium - it was not clear, but they were saying "100 - 200K miles". I'm thinking I will wait until spring since it's running so nice right now.

  6. #26
    Jr. Mechanic djthumper's Avatar
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    I would wait for it to warm up definitely. Also it is highly recommended to use the AC Delco iridium plugs to replace them as well. Other brands are not lasting as long. That video was done by a mechanic that owns a TB with the I6 and an SS.

  7. #27
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    DJ!! Whats up?? Happy Holidays! So, I picked my tires.. sexy.. but I dont know if I should do 18, 19, 20.. I just emailed Mark and we are discussing size, width etc.. I want to show you my tires and rims, but I dont want everyone else to copy me..haha!! Hope that your truck is running great! LIFT KIT SOON!! Woot!! take care, talk to you soon



    2008 GMC ENVOY SLT
    GT RACERS Black Diamond Grille
    | PIAA Headlights| BEAMERS Pro HID Kit 6,000K Diamond White |
    3" LiftMeister Body Lift Kit
    |Skyjacker Suspension| MagnaFlow Exhaust w/tip |Hella Supertone Horns| Blacked out Body


    "Silly Boys! Lifted Trucks are for Girls"
    "If you can't beat 'em, then your going to slow" :sign0081:

  8. #28
    Jr. Mechanic djthumper's Avatar
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    Quote Originally Posted by GMCErica View Post
    DJ!! Whats up?? Happy Holidays! So, I picked my tires.. sexy.. but I dont know if I should do 18, 19, 20.. I just emailed Mark and we are discussing size, width etc.. I want to show you my tires and rims, but I dont want everyone else to copy me..haha!! Hope that your truck is running great! LIFT KIT SOON!! Woot!! take care, talk to you soon
    Happy Holidays! Personally I would probably stick with 17s if I could. I stuck with 16s on mine to give me more flex in the sidewalls. You can always send me a PM. Did you see that I got some new rims for mine? Here is the link http://www.gmtruckclub.com/forum/sho...828-New-Wheels

  9. #29

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    I'm assuming the 2005 model I have came with the platinum AC plugs(?) I will get the iridium as long as it matches the OEM version, which I'm sure it does if it's made by AC Delco.

    As far as warming it up, I think that's a good idea. In the video he basically has the whole thing back together when he started it, except for the plastic throttle body shroud piece, so I'm thinking that I'll just finish the job and test it all together - a "road test". I mean, if it is missing or something, it's not that big a deal to loosen those few hoses and get to the plugs again if I really needed to.

    I'll have a lot more time than this guy took. He's probably a pro. He mentioned cleaning the throttle body but he did not show that in the video. I think I should probably do that. I had to do that constantly with my old Toyota pickup because the throttle body (gas pedal) would constantly stick in the "closed" position (better than open I guess!). Funny thing is that I didn't need to do this after a few years which had me wondering if it was something to do with the fuel I was using in California. Maybe just the dirtier air, who knows....

    I've gotta buy some of that anti-seize stuff he was using too. Seems like a good idea.

  10. #30
    Jr. Mechanic djthumper's Avatar
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    Here are the plugs ACDelco Iridium - Spark Plug Part # 41-103


    It is a good idea to use anti-seize with the aluminum block to keep from tearing up the threads.

    Here is the throttle body cleaning video


    If you want to read it here is an article of how-to for the throttle body. http://gmtnation.com/content/how-cle...ttle-body-120/

    I hope this helps, here is a link to a play list that I have of all of the helpful Trailblazer videos I have found. http://www.youtube.com/playlist?list=PL60140F623AD704DA
    Last edited by djthumper; 01-03-2012 at 08:22 PM. Reason: added a link

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