Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Carb problems

Discussion in 'The Garage' started by jaredmajor, Jan 25, 2006.

  1. jaredmajor

    jaredmajor Registered Member

    Joined:
    Mar 2, 2005
    Posts:
    96
    Likes Received:
    0
    Location:
    Anchorage, AK
    i have a 650cfm mechanical secondaries holly carb. Off idle, cruising or anything if i step on it hard it cuts out for a second, but once i get past that point and floor it, no problems. Is it loading up or what? any ideas? :dunno:
     
  2. eagle mark

    eagle mark 1/2 ton status

    Joined:
    Nov 18, 2004
    Posts:
    3,289
    Likes Received:
    1
    Location:
    North Idaho!
    Accelerator pump adjustment or replacement.
     
  3. jaredmajor

    jaredmajor Registered Member

    Joined:
    Mar 2, 2005
    Posts:
    96
    Likes Received:
    0
    Location:
    Anchorage, AK
    Cool, should i replace it, i think i have it adjusted right, according to a holley tuning book. What about replacing it, i noticed there are 30cc and 50cc, which would be better for gas millage, or does it matter?
     
  4. theperfectgarage

    theperfectgarage 1/2 ton status

    Joined:
    Oct 5, 2005
    Posts:
    988
    Likes Received:
    0
    Location:
    tucson arizona
    Could be the pump shot, the 50cc will use a bit more fuel, but I would'nt sweat that.
    Could also be your secondarys opening to fast.
     
  5. jaredmajor

    jaredmajor Registered Member

    Joined:
    Mar 2, 2005
    Posts:
    96
    Likes Received:
    0
    Location:
    Anchorage, AK
    I'm pretty shure it's not the secondaries, it's right off idle, i don't know.
     
  6. theperfectgarage

    theperfectgarage 1/2 ton status

    Joined:
    Oct 5, 2005
    Posts:
    988
    Likes Received:
    0
    Location:
    tucson arizona
    I agree, I must have missed the part of " just Off idle ".
    Then i'ts back to the pump shot. Does your model carb use the different colored nylon pump cams on the throttle shaft ? How about your idle air fuel mixture screws ? Maybe too lean there ? How about vacuum leaks, have you checked for that?
     
  7. jaredmajor

    jaredmajor Registered Member

    Joined:
    Mar 2, 2005
    Posts:
    96
    Likes Received:
    0
    Location:
    Anchorage, AK
    it's a 4150, i dont know about the colored cams. I set the idle air mixture in colorado(elevation) and it acted the same there. I am in anchorage AK now and at see level. I don't think the idle air mixture is it. It's acted the same at both low and high elevations and i had it dialed right it. As for vacuum leaks, none, i only have two vacuum lines. I am almost positive now it's the pump. I will check with napa and see if they have a little kit, then see what happens.
     

Share This Page