340 thermoquad hard starting

Fuel and Air Systems

  1. dancinwulf

    dancinwulf Well-Known Member

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    My 340 starts immediately once running but is hard to start when cold, is there a choke that can be fitted or is there any tricks I can try.
     
  2. toolmanmike

    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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    It should have a choke that closes when you push the gas pedal to set it when you start it cold.
     
  3. dancinwulf

    dancinwulf Well-Known Member

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    It does but I don't think it stays closed long enough is there an adjustment
     
  4. missing linc

    missing linc Loose nut behind the wheel

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    Pics would help, need to determine the existing setup, whether your carb is oe or aftermarket
     
  5. dancinwulf

    dancinwulf Well-Known Member

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    Here are the views from both sides
     

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  6. toolmanmike

    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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    It has a choke butterfly and some linkage but no chole coil in the intake to close it when cold. You may need to get a Factory service manual to find all the needed parts and adjustments. PS, loading photos directly to the site is quite easy and much more convenient for us.
     
  7. dancinwulf

    dancinwulf Well-Known Member

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    Not sure how to accomplish that I thought that was what I was doing
     
  8. toolmanmike

    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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    Just a couple keystrokes and I found this. You can see what you are missing. It would be smart for you to check the number on the intake and carb to make sure they are compatible with the choke pieces you will need. If you have a mish mash of parts it will be a lot tougher to come up with the right combination.

    thermoquad.jpg
     
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    • 70 DUSTER CRATE

      70 DUSTER CRATE Well-Known Member

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      I like a hand choke cable.
       
    • lemondana

      lemondana BlackDart

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      I think Quadrajet Parts has an electric choke conversion that bolts onto the manifold like the original one does.
       
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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      • 66fs

        66fs FABO Gold Member FABO Gold Member

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        That should do it. A TQ needs to have the choke close to start cold.
         
      • toolmanmike

        toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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        Yep, it's not like a Holley that squirts a couple shot glasses of gas with every stomp on the loud pedal. :lol:
         
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        • lemondana

          lemondana BlackDart

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          I've been using them for a long time. They haven't worked well, take forever to heat up. You need to use that little resistor thing called the choke control. The power wire plugs into the choke control and the choke control plugs into the choke wire. I'm sure it will work like Chrysler intended then. That Tomco one doesn't have the wire but the factory ones and the Carter ones do. The part number for the choke control is 3755770. The early mechanical TQ chokes that used a gasket below the well cup always seemed to work better for me.
           
        • lemondana

          lemondana BlackDart

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          Sorry" I meant to quote Rustys post for the above.
           
        • RustyRatRod

          RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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          You are correct in that they don't heat up quickly, but not all of them were electric, either. The elarly TQ cars didn't have the electric assist. I was trying to choose the most economic option. Those electric ones are pricey.
           
        • RustyRatRod

          RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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          Especially the ones whose choke well is actually open to the exhaust cross over. Those really work well.
           
        • 66fs

          66fs FABO Gold Member FABO Gold Member

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          That one is perfect. There was a truck choke that is not electric, I always used the truck one myself. I'll try and look the Chrysler number up later.
           
        • missing linc

          missing linc Loose nut behind the wheel

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          I ran a TQ for years without the choke, from -40 to 90* above, had to pump the thing about 40 times on cold days and feather it for few minutes once she did fire.
           
        • 66fs

          66fs FABO Gold Member FABO Gold Member

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          I also ran a TQ for years. Set it up right, it ran like fuel injection from -20 to 100+. Do it right and forget about it.
           
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          • missing linc

            missing linc Loose nut behind the wheel

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            I ran an open element air cleaner year round, only had a problem once. Froze up on a really cold night on the highway
             
          • 66fs

            66fs FABO Gold Member FABO Gold Member

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            Wow. I ran an original 68 unsilenced air cleaner without problems.
             
          • 66fs

            66fs FABO Gold Member FABO Gold Member

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            Look for these on 73 up TQ manifolds. Relatively cheap, works great.

            P1010003.JPG
             
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