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  1. #11

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    If we're talking about a TB there on top of the motor under the air box and they have coils over them with one bolt and fins on the coils.
    I thought there were two bolts on each coil pack? Anyway the box that says "Vortec 4200" is called the resonator box and covers the coils. It is important to remember that there is a fuel pressure vacuum hose attached near the front drivers side of it and the PCV valve hose connects on the bottom.



    Jamie

    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  2. #12

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    Quote Originally Posted by Cableguy View Post
    If we're talking about a TB there on top of the motor under the air box and they have coils over them with one bolt and fins on the coils.
    I thought there were two bolts on each coil pack? Anyway the box that says "Vortec 4200" is called the resonator box and covers the coils. It is important to remember that there is a fuel pressure vacuum hose attached near the front drivers side of it and the PCV valve hose connects on the bottom.
    HUH what is a TB I just want to change plugs out and what is a coil pack??

  3. #13

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    okay called chevrolet and they told me to pull the metal boot surounding the plugs and wires should just come of and they did what a relief!!!

  4. #14
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    I will wait as long as possible; it's not easy to replace those things on a GMC Savana did it last year there was no skin left on my hands
    Peter Smet
    Haasdonk, Belgium

  5. #15

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    Quote Originally Posted by gbal4 View Post
    okay called chevrolet and they told me to pull the metal boot surounding the plugs and wires should just come of and they did what a relief!!!
    Oh Ok sorry, this was a Chevrolet Trailblazer or Envoy right? But it sounds like ya got it.



    Jamie

    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  6. #16

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    well after changing plugs I still have the miss problem sounds like something is stuck in the engine it threw a code and said that the # 7 was miss firing so I assume it is a coil plug they are on top of the valve covers is there a way to test the coil packs?? does autozone sell them?? got to get this problem fixed does anyone know what side and were is the # 7 cyllinder located at
    Last edited by gbal4; 05-11-2007 at 11:00 PM.

  7. #17

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    okay I need help I have changed out the plugs wires and I also replaced the coil pack. The computer is throwing a code that the # 7 cylinder has a miss fire WTF when I pulled # 7 spark plug it has some gas on it??? What could cause this?? please help!!! my truck has a rough idle and when given gas it`s like it sputters I give up!!

  8. #18

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    problem solved it was a clogged fuel injector dealer fixed it what a relief

  9. #19

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    Quote Originally Posted by gbal4 View Post
    problem solved it was a clogged fuel injector dealer fixed it what a relief
    Glad you got it fixed.

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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  10. #20

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    Great Chevy Trailblazer thread, this is epic and needs to not die down!

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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