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Car running rough.. where to start?

Discussion in 'Engine / Swaps etc.' started by dave_s1987, Aug 23, 2017.

  1. dave_s1987

    dave_s1987 Greasemonkey

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    Hey guys, Im having some issues getting my car going. I just got the cam shaft broken in and changed the oil. I started it back up and she idles really good so I got it up to temp and then put my air filter on and decided to go for the maiden voyage.

    It did not run good for very long.. after driving for about 3 minutes I came to stop and it started to stall.. I kept trying to give it some gas but it eventually did stall out and I was not able to get it started again.

    I waited about 25 min and then finally got it start again but only if I'm holding the gas petal down. As soon as I slow down or stop it just stalls again and won't start for a bit.

    Not sure if it's a carb adjustment or what? Just figured I would see if anyone had any ideas off the top of their head while I'm sitting at the side of road lol

    Oh and it's a Holley 750 do carb and 355 sbc motor. Both fresh off rebuild

    Dave
     
  2. pontiacgp

    pontiacgp Rocket Powered Basset Hound

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    did you checked the fuel levels in the bowls? That carb is too big for a 355, a 600 would work much better or even better put a Quadrajet back on your engine
     
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  3. dave_s1987

    dave_s1987 Greasemonkey

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    Thanks a Lot for the tip! I'll try it in a couple min and let you know how I make out
     
  4. pontiacgp

    pontiacgp Rocket Powered Basset Hound

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    if you have to hold the pedal to the floor to start the carb is flooding.
     
  5. dave_s1987

    dave_s1987 Greasemonkey

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    Right now I'm just working with what I have unfortunately so I don't have the option to buy a new carb at the moment. I already plan to replace it with a Holley 650 dp instead and add a 2 inch air gap. That's what the engine builder recommended I put on it so figured I would go to that eventually.

    So I ended up plugging the fuel lines and starting car and running it dry like you said. Then of course I got to start it back up and the damn key snaps off in the ignition! It's always seems to be one thing after another for me these days.

    Unfortunately I have to head off to work soon so looks like I am going to have to push it back into my garage and try to tackle these issues another day.

    Thanks for the help though.

    Dave
     
  6. fleming442

    fleming442 Master Mechanic

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    Filthy!
    I hate it when crap like that happens.
     
  7. axisg

    axisg Royal Smart Person

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    x2 if you can get it to run and checking the floats ( real easy on a holley ) by unscrewing the sight plugs. If anything dribbles out they are either too high or stuck open. If there is more than a dribble give it a couple raps with the plastic end of a screwdriver to see if they come unstuck. If its an older Holley check the power valve which if it were bad would seep raw fuel into the intake as well.

    Or I have a great little holley carb here with vacuum secondaries you can have for not much money.
     
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  8. pontiacgp

    pontiacgp Rocket Powered Basset Hound

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    I posted that before I noticed you have a Holley, that trick works on a Quadrajet but I don't think it would work on a Holley so I changed my post. If that does work on a Holley please let us know.
     
  9. dave_s1987

    dave_s1987 Greasemonkey

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    thanks for the advise. I am going to get the key out on my lunch break (luckily I live 5 min from work) and try and fire it up to have a look at those sight plugs.

    If I don't seem to be getting anywhere I may actually be interested in that carb you have. What kind of shape is it in? is it ready to bolt on or would it need a rebuild first?

    thanks again!
     
  10. dave_s1987

    dave_s1987 Greasemonkey

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    if for some reason that ended up working you will be the first to know lol
     
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