318 will not start

Small Block Mopar Engine

  1. Magnum87

    Magnum87 Well-Known Member

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    Have a 73 Coronet with a stock 318 2 barrel. Just got it. The previous owner said car was running fine until about 2 weeks ago and wouldn’t start- just would crank nothing. Seemed to think it was the fuel pump. Have the car home. And it hit and soon as I cranked it. That’s all I can get it to do is hit. Hits better when holding the gas pedal to the floor. I verified I’m getting spark. I changed the ballast and ECU just to be safe. Also it’s getting fuel u can see it in the carb when working the throttle. U can smell gas also and it’s bad out the exhaust after it hits several times.
    Is the car just flooded? I tried starting it with the pedal to the floor and never let up and like I said it hits better but that’s it. Any ideas??
     
  2. Magnum87

    Magnum87 Well-Known Member

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    Also choke is closed.
     
  3. j par

    j par Well-hung Member

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  4. MOPAROFFICIAL

    MOPAROFFICIAL FABO Gold Member FABO Gold Member

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    Two things I would do I would have a can starting fluid and try that then I would grab the crankshaft and see if I could turn it back and forth without the cam turning=timing chain worn/chain slack/jumped teeth.

    If it fires and runs a few seconds on the starting fluid....the carb has a major vacuum leak, simply even the base plate gasket could be the cuprit.
    Overall it sounds like you covered the ballast/ignition box and verified spark...
    You can also just spray a lil wd40 on the carb and base gasket and try to start it...and or get it running with the starter fluid then put your hand over the carb and if it all the sudden idles fine.. carb gasket time.
     
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    • MOPAROFFICIAL

      MOPAROFFICIAL FABO Gold Member FABO Gold Member

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      Pin the choke open for now if you want... but its supposed to be closed when engine is cold
       
    • Magnum87

      Magnum87 Well-Known Member

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      I know it’s supposed to be closed when it’s closed. Was just saying. Also no backfires.
       
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      • MOPAROFFICIAL

        MOPAROFFICIAL FABO Gold Member FABO Gold Member

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        I hear ya.
         
      • AJ/FormS

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

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        Spark test.
        If it's flooded, you will have to unflood it. and by this time,you will likely have to squirt some oil on the cylinder walls.
         
      • MOPAROFFICIAL

        MOPAROFFICIAL FABO Gold Member FABO Gold Member

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        Im wondering where op is, maybe op is trying the advice .
         
      • 67Dart273

        67Dart273 FABO Gold Member FABO Gold Member

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        Random thoughts
        Compression
        Fuel
        Spark

        Compression.......any idea how much? Might want to run a compression / leak down test. Might want to ponder "is the timing chain slipped" Has the thing been sitting a lot? Maybe the rings have lost compression, and over-priming with fuel has 'washed the cylinders' lowering compression

        Fuel......make sure it's fresh, make sure the plugs are decent and not fuel fouled. Don't be afraid to dump some down the throat....known fresh, that is

        Spark.....good spark and at the right time. Just how good IS the spark? Rig a gap/ tester out of the coil, using a solid core wire. Rig it so you can see the gap through the hood gap, and crank it using the key, not by jumpering the start relay. Also does it crank good and "zippy?" How is battery condition? You should get nice snappy blue spark at least 3/8" and typically 1/2"

        Might check the timing. You can do that on the starter as well.
         
      • 318willrun

        318willrun Utube channel 318willrun

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        So much it could be, and very little to go on....
        • Verify you have valve timing... nylon cam gear are always suspect
        • Verify you have spark at the Spark Plug
        • Verify gas is coming out of the carb into the intake (accelerator pump)
        Even if you have a major vacuum leak, such as the PVC hose isn't plugged in, it will still start and run but not want to idle.
         
      • pishta

        pishta I know I'm right....

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        friend had a brand new Edelbrock on a 390 Galaxy. Thing would not start, he called me and I went over, stuck my finger in the open power brake fitting on the back and said "You got a leak". The threaded allen plug was rolling around the bottom of the carb box. hand threaded it and it started right up. I bet you got a large leak, like your power brake hose is unplugged?
         
      • Magnum87

        Magnum87 Well-Known Member

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        Ok thanks everyone for the advice. I will follow up and let u know more tomorrow. Just got the car in the garage and I gotta get a few hours sleep for work. I will go with your suggestions and report back starting tomorrow. Thanks again
         
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        • RustyRatRod

          RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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          What in the world does "hit" mean?
           
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          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

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            Go pull your pcv hose on your stock 318 and tell me it doesnt still run. More bs

            It will still idle in park with the pcv pulled and open on a stock 318.
            Fin
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

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            They just forgot the 'S' lol
             
          • RustyRatRod

            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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            lol
             
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            • 318willrun

              318willrun Utube channel 318willrun

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              I'm not on ignore still?? boy is that disappointing :(
               
            • Magnum87

              Magnum87 Well-Known Member

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              Sorry about the hit part.... means it runs for 2-5 seconds or whatever just a term I have heard other people use over the years
               
            • 67Dart273

              67Dart273 FABO Gold Member FABO Gold Member

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              Well I knew what ya meant, but I'm from Idaho LOL
               
            • MOPAROFFICIAL

              MOPAROFFICIAL FABO Gold Member FABO Gold Member

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              I bet. Now you get the whistle every time you fk up. You're in my world now ...
              :mob: :mob::mob::mob: :welcome:Haha :mob:
               
            • Bodyperson

              Bodyperson Pedal to the metal

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              Does it "hit" while cranking or does it "hit" a bit with the key in the run position? Not cranking.
               
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              • Car Nut

                Car Nut Mopar Master

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                I had a 318 in a 70 Challenger that had a broken distributor pin/gear. The shop that sold me the car said they tried everything to get it to run. This was 30 years ago.

                Does the distributor turn with the cap off?
                 
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                • Mopar Sam

                  Mopar Sam Well Fed Member

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                  If it "Hits" while cranking, but won't keep running when you release the key, the first thing I would check would be the Ballast resistor.
                   
                  Last edited: Dec 23, 2020
                • flyfish

                  flyfish C8H18+N2O = :-D

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                  Had a similar issue years back with my 87 D150...after replacing everything, and I do mean EVERYTHING (fuel pump, fuel filter, orange box, ballast, plugs, wires, cap, rotor, distributer, coil, and carb) it still didn't work....then I found 1 small vacuum leak at the brake booster, fix it and it started right up and ran like a champ.....I felt like a serious idiot after that, lol.
                   
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