1. Ahatchett

    Ahatchett Well-Known Member

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    Screenshot_20170831-235034.png I just rebuilt the 318la in my 1974 Duster and it wont stay running. I honestly dove in deep over my head before this I'd never taken off a valve cover.
    So here's the issue, the car kinda starts with the choke on but only with the throttle all the way open. With the choke open the car runs okay but i can't get it to idle for the life of me.
    Ive got 120psi+ on all of the cylinders. My floats arent sticking. All the jets and passages are clear. Vacuum hoses are hooked up correctly i think? It's timed to 8 degrees. All the spark plugs are black and soaked in gas. What should i do?

    View attachment 1715088084
     
    Last edited by a moderator: Sep 1, 2017
  2. 73Swinger18

    73Swinger18 ✱ⓈⓌⒾⓃⒼⒺⓇ

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    What kind of carb? Maybe your idle mixture screws are open too far. Try lightly seating them, then back them out 1.5 turns.
     
  3. Ahatchett

    Ahatchett Well-Known Member

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    Its the stock carter 2bbl and i tried the seating the idle screws then backing them out .5 turns at a time it still wont run.
     
  4. 73Swinger18

    73Swinger18 ✱ⓈⓌⒾⓃⒼⒺⓇ

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    Did you verify TDC and get the distributor lined up right? Plug wires in the right order?
     
  5. Ahatchett

    Ahatchett Well-Known Member

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    I was 180 off the first time i tried to fire it but that and tdc. Were fixed and double checked.
     
  6. harrisonm

    harrisonm Well-Known Member

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    I think I see the problem. The car is lying on its side and the fuel is flooding into the carburetor. LOL
     
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    • Ahatchett

      Ahatchett Well-Known Member

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      Now that i think about it, that very well could be the problem:rofl:
       
      Last edited: Sep 1, 2017
    • 73Swinger18

      73Swinger18 ✱ⓈⓌⒾⓃⒼⒺⓇ

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      Maybe your fuel delivery is fine and you're not getting ignition. Your coil, ECU, or ballast resistor could be failing. Have you tested the spark?
       
    • Ahatchett

      Ahatchett Well-Known Member

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      I have strong spark, new coil, wires, plugs, cap and rotor. Along with a new control module.
       
    • 73Swinger18

      73Swinger18 ✱ⓈⓌⒾⓃⒼⒺⓇ

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      When you say it's timed to 8 degs, do you mean 8 degs BTDC? I'd increase it to 12-14 degs BTDC and make sure your idle in gear is between 700-800 RPM.
       
    • Ahatchett

      Ahatchett Well-Known Member

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      Yeah i meant before top dead center ill try adding some more.
      I also forgot to mention i put a bigger cam in it.
       
    • Ahatchett

      Ahatchett Well-Known Member

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      Cam specs are as follows
      Valve lift .477intake/.480exhaust
      Lobe separation 110°
      Duration at .05 lift 268
      Valve timing 0.006

      I also ported the heads a bit.
       
    • mullinax95

      mullinax95 Well-Known Member

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      Sounds like your plugs are fouled. Clean them and try that.
      Add timing.
      Did you degree the cam upon installation?
       
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      • d55dave

        d55dave Well-Known Member

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        If you cant get it to run how do you know it is timed right? It sure sounds like it needs more advance. Try twisting the distributor ccw in small increments and try starting it. Do the final timing once it is running well.

        Two other thoughts, are you 100% certain that the cam is properly installed and degreed?

        When it is running, if you look down the carb throat do you see fuel dribbling out the venturis? You should not see any.

        Good luck!
         
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        • Faster74

          Faster74 Banned

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          is it that it wont start, or wont idle after start
           
        • toolmanmike

          toolmanmike FABO Staff Staff Member FABO Gold Member

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          Fixed!
           
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          • toolmanmike

            toolmanmike FABO Staff Staff Member FABO Gold Member

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            If your timing is even close, the firing order is correct and you have spark at the spark plugs, it almost has to be too much fuel. Can you look down the carb and see fuel dribbling? I see you have a new fuel pump? It may have too much pressure. 5# is fine, 10# will cause what you are experiencing. My friends Super Bee went through 2 mechanical pumps before we put a fuel pressure regulator on it. That fixed the rich running problem. Something to look at.
             
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            • fatoldguy

              fatoldguy Well-Known Member

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              You didn't mention what plugs your running , are they old or new? Are they all fouling ?
               
            • diymirage

              diymirage HP@idle > hondaHP@redline

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              have you verified timing and top dead center?
              (what i mean is, when the number one piston is at top dead center, of the compression stroke, is the timing mark at 0 degrees? they slip some times)

              you mentioned you never did this before, please tell us exactly how you lined up the timing marks on the cam

              you did not by any chance swap out the timing covers, did you ?
               
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              • Ahatchett

                Ahatchett Well-Known Member

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                I didn't degree my cam
                 
              • Ahatchett

                Ahatchett Well-Known Member

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                [/QUOTE]

                I havent been able to look in the carb yet but ill see if i can today, it does occasionally shoot fire back out of the carb though so im not sure if i want to try that.
                 
              • 73Swinger18

                73Swinger18 ✱ⓈⓌⒾⓃⒼⒺⓇ

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                Triple check your firing order...
                Firing Order.jpg
                 
              • Ahatchett

                Ahatchett Well-Known Member

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                Really hard to start, choke cant be closed and then it wont stay running below 1000rpm
                 
              • Ahatchett

                Ahatchett Well-Known Member

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                Im running e3 plugs, they arent fouled they're just black and soaked in gas. And they are new
                 
              • 73Swinger18

                73Swinger18 ✱ⓈⓌⒾⓃⒼⒺⓇ

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                Sounds like you have the XE268H Comp cam. With the low compression, it won't run at lower RPM without a lot more timing. Crank it up.
                 
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