1. Mike1972

    Mike1972 Well-Known Member

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    My nephew has a very nice looking valiant with a mild built 318. It starts easily and sounds really good. Problem is when you put it into drive or reverse it dies. Sometimes even if you 2 pedal it. We installed a new carb but still the same problem. Any ideas?

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  2. Demonic

    Demonic Well-Known Member

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    Nice looking car. Do you have a vacuum gauge? What is the idle speed in park? Two feet on the pedals might be asking for trouble. I would get a kit and the specs for the old carb and rebuild it myself.
     
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    • Mike1972

      Mike1972 Well-Known Member

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      It happens even with just foot on the brake. It adles about 1000 to 1200 rpm. No vacuums on the engine.
       
    • Mikes270dart

      Mikes270dart Well-Known Member

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      2 carbs same problem, probably not the carb. Did it ever run, is this a new build? That idle is way to high. No vacuum, you got a huge vacuum leak
       
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      • Mikes270dart

        Mikes270dart Well-Known Member

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        Does it have power brakes? Could be in the booster. isolate the booster and then apply brakes. see if it still stalls
         
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        • Mike1972

          Mike1972 Well-Known Member

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          Its isles great and drives great. Just really tough to get it into drive or reverse without it dying.
           
        • Mike1972

          Mike1972 Well-Known Member

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          Where would you suggest hooking up to check the vacuum?
           
        • Mikes270dart

          Mikes270dart Well-Known Member

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          Check all hoses from the carb and the manifold for cracks. If the hoses are fine disconnect each hose and check for a change in engine sound. Make sure that all ports on the carb are being used or properly sealed. Can you get it to idle lower than 1200. It should be around 800, depending on how much cam is in the engine.
           
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          • Dave 74 Dart

            Dave 74 Dart Well-Known Member

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            My son's 360 4 barrel dart had the exact same issue. Starts, idles, but put it in drive or reverse and it would die unless you feathered the pedal upto a decent speed. Reverse was much worse than drive. Ended up being the thin carb gasket, installed the thick one and all was great. Had to re-adjust the idle ect.
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

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            What are the camshaft spec's.
            Probably not enough initial timing at idle without having too much at full advance.
            You more than likely need to re curve the distributor and shorten the centrifical advance. It should be idling around 800 and 650-720 in gear, roughly speaking of course.
             
          • Garrett Ellison

            Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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            Nice looking car, care to post an under hood pic?
             
          • AJ/FormS

            AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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            I'd say the transfer slot is too lean, but you'd have to have waaaaaaaaaay too much idle timing to get the idle that high with the throttle closed that far ........... unless the secondaries are not closing all the way.
             
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            • krazykuda

              krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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              Find a low open port near the base of the carburetor... The high port on the pass side of the carb (about halfway up) is ported vacuum for the vacuum advance on the distributor...
               
            • krazykuda

              krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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              Have you adjusted the choke???
               
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