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cold and hot start problems sbc

Discussion in 'The Hokey Ass Message Board' started by MarkKoch, Nov 24, 2010.

  1. MarkKoch
    Joined: Jan 16, 2010
    Posts: 294

    MarkKoch
    Member
    from Maryland

    I'm having cold and hot start problems w/ my 350.It has a mild cam,edelbrock performer intake and carb,Gear drive.Headers.The motor stumbles, cuts out and after a few more tries it will start but only if I blip the throttle just a bit for half a minute.There is not a heat riser from the headers into the intake.Manual choke.It does this same thing when the motor is cold and when its hot on a restart
     
  2. MarkKoch
    Joined: Jan 16, 2010
    Posts: 294

    MarkKoch
    Member
    from Maryland

    Once motor starts and gets to temp it runs great
     
  3. Splinter
    Joined: May 14, 2005
    Posts: 1,112

    Splinter
    Member

    Sounds like your idle mixture might be too lean. But the cold start thing sounds normal-what CFM carb? Mechanical or elctric fuel pump? Sitting how long when this happens?
     
  4. Splinter
    Joined: May 14, 2005
    Posts: 1,112

    Splinter
    Member

    and what ignition? If you have the stock points, you need the "Chevy start bypass" wire to give a hotter spark during cranking....
     

  5. MarkKoch
    Joined: Jan 16, 2010
    Posts: 294

    MarkKoch
    Member
    from Maryland

    Cold start is when its been sitting a few days.I believe its the 600 cfm carb.Electric fuel pump at 9psi
     
  6. MarkKoch
    Joined: Jan 16, 2010
    Posts: 294

    MarkKoch
    Member
    from Maryland

    When its cold I give the fuel pump about 20 sec to get fuel to the carb.Close choke all the way.Push gas pedal in once and attempt to start.If it seems like its close to actually starting I will then close choke half way....is this the correct way?
     
  7. Lobucrod
    Joined: Mar 22, 2006
    Posts: 4,122

    Lobucrod
    Alliance Vendor
    from Texas

    All carbureted engines have their own combination when it comes to starting them. In cold weather you well normally pull the choke all the way out (closing the choke butterfly) Pump the accelerator once and hold it down about half way, crank on the starter and if it starts push the choke in about half way or to a point where the engine idles smooth. Sometimes it may take a pump or two on the accelerator pedal and sometimes not.
    In warm weather or with a warm or hot engine maybe no choke is needed just a pump or two on the pedal. Just have to get a feel for what yours likes. No EFI to do the thinking here.
     

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