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2004 GMC Envoy 4.2l 275hp CNG Conversion

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  • 2004 GMC Envoy 4.2l 275hp CNG Conversion

    Before posting I swear I called and / or e-mailed every aftermarket CNG Conversion place listed in the file of companies on this forum and I can not find anyone that supports my 2004 GMC Envoy 4.2l GM Engine for conversion. Can anyone point me in the right direction here or at least tell me to give up because it is not supported by anyone? I was really hoping that a CNG conversion would be the ticket for me since I love my car but hate the mileage. I've checked out the water for fuel, electric, additives, engine mods, spark plug upgrades - you name it - and CNG seems to be the only legitimate thing out there but I'm starting to think I got my hopes up for nothing

  • #2
    Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

    Check out John's new posting:

    In the General section.

    "Can I convert my ____ to run on natural gas?"
    Please read this before posting questions on converting vehicles.
    CH

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    • #3
      Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

      Originally posted by emhudson View Post
      Before posting I swear I called and / or e-mailed every aftermarket CNG Conversion place listed in the file of companies on this forum
      I reviewed all of the information on this site, as I said, and called all of the companies listed in the documentation, as requested by the site administrators, and I am looking for someone that may have hear something that is not posted in that sticky link. So thanks for your suggestion and direction to check that before posting, but I said in my post that I checked it so you;re really not helping me that much

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      • #4
        Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

        Email [email protected]

        They're close to having EPA certification for two Impala engines. He **might** know of someone who has worked with an Envoy conversion or retrofit.

        (My sister has an Envoy...it's awesome to drive. Most comfortable vehicle I've ever driven.)

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        • #5
          Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

          It basically comes down to numbers. There are not a lot of those 4.2l engines on the road (relatively speaking, of course). Even less in use by any sort of commercial/government fleet. Therefore, there really hasn't been any sort of demand for a kit for that engine. Certainly not enough to warrant the time/effort/cash required to get something certified.
          1997 Factory Crown Victoria w/ extended tanks ~~ Clunkerized!
          2000 Bi-Fuel Expedition --> ~~ Sold ~~ <--

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          • #6
            Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

            does that happen to be the same motor in the new gm Acadias or chev Taverse? We've been looking at those and I would be interested in a conversion.

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            • #7
              Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

              Acadia and Traverse use a V-6 3.6l. I think that the 4.2 in line 6 is/was used only in the "Trailblazer class" suvs (Chevy Trailblazer, GMC Envoy, Olds Bravada, Isuzu Ascender, Buick Rainier, Saab 9-7X). Most of these are no longer made.

              Maybe that is why GM is struggling. They had to make 6 different grills for the same suv.
              Last edited by karlhafen; 04-02-2009, 08:06 PM. Reason: typo

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              • #8
                Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

                What a shame . . . GM brought back an I-6 engine with great horsepower AND great fuel economy (25+ mpg for Trailblazer), and what did they do . . . kill it!! Sounds familiar to EV-1 or other good things.

                The I-6 engine would be easy to add cng conversion, would have broad range of vehicles it would work in (cars to trucks, etc.), and yet GM in their "infinite wisdom" falls back to age old gas gusslers V-6 and V-8. I say good riddance to former CEO to GM . . . . and for all I care, let the old GM dog go bankrupt!! If I didn't see it happen EVERY day for the last 10 to 20 years, the goal of US automakers (and the good ole Big Oil sub-department of EPA) just keep cranking out same old junk that only gets 15 to 25 mpg - - - can you say Engineered Ineptitude, or Pre-Determined Petrol Consumption!!!

                My guess is I-6 engine will be back within 2 model years at most, if not sooner!! And only super duty trucks will have V-8's and electric cars will become reality.

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                • #9
                  Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

                  Originally posted by cngacrossusa View Post
                  What a shame . . . GM brought back an I-6 engine with great horsepower AND great fuel economy (25+ mpg for Trailblazer), and what did they do . . . kill it!! Sounds familiar to EV-1 or other good things.

                  .
                  I agree. Seems like a real waste to not let the 4.2 live up to it's potential. My opinion of the "high feature" 3.6 v-6 is that it is underpowered in many of the vehicles GM is using it in. It is great in cars however.
                  Last edited by karlhafen; 04-02-2009, 10:08 PM. Reason: typo

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                  • #10
                    Re: 2004 GMC Envoy 4.2l 275hp CNG Conversion

                    I seriously doubt anyone produces a kit for this vehicle. The problem isn't so much the engine but tank mounting. There isn't really any place to put a tank without some major mod's and since the vehicle is so narrow, you'd only have some tiny tanks to boot.

                    Kyle

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