No Acceleration!!

Discussion in 'Technical' started by dschrodt, Mar 23, 2008.

  1. dschrodt

    dschrodt Member

    Joined:
    Feb 14, 2007
    Messages:
    61
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Ellijay, Georgia
    Vehicle:
    1969.5 Maverick
    Help!!

    Our 69.5 with the 170 and a single bbl Carter YF is losing acceleration on the slightest of hills. It starts to flood out, as we push the pedal to the floor to get up any hill, and the car starts to die. It starts and idles great, we think we have the mixtures right, as we don't get much in the way of black smoke out the pipe. When you rev the engine sitting, it roars just fine. Under load (drive or reverse)though, it want's to cut out with the pedal about halfway to the floor....It appears that the curb idle and fast idle are about right. It's when we head up the hill, that it just dies, and floods out..

    Any ideas or suggestions????
     
  2. 71gold

    71gold Frank Cooper Supporting Member

    Joined:
    Apr 9, 2002
    Messages:
    26,590
    Likes Received:
    2,935
    Trophy Points:
    978
    Garage:
    1
    Location:
    MACON,GA.
    Vehicle:
    '73 Grabber
    ...no help...but can see why you would need it fixed. where you live...it's uphill both ways...:D

    ...Frank...:drive:
     
  3. Jamie Miles

    Jamie Miles the road warrior

    Joined:
    Feb 8, 2005
    Messages:
    12,098
    Likes Received:
    29
    Trophy Points:
    383
    Location:
    Lawrenceville, GA
    Vehicle:
    13 Mavericks
    Is it really flooding out or going lean? Is this going up those huge hills by your house? I'd wonder if the float level is set too high and the fuel is spilling over into the carb through the vent tube. If you get it out on the highway, does it run alright? It's definitely not going to have the same acceleration as it did with that 4.10 gear, but it shouldn't be too bad, and it shouldn't be bogging. Is the kick down on the transmission working right?


    You been there? He definitely lives up some BIG hills!
     
    Last edited: Mar 23, 2008
  4. Dave B

    Dave B I like Mavericks!

    Joined:
    Mar 9, 2002
    Messages:
    16,931
    Likes Received:
    215
    Trophy Points:
    347
    Location:
    Parts Unknown......
    Vehicle:
    3 Grabbers
    Is the choke operating properly? Opening the way it should be?
     
  5. dschrodt

    dschrodt Member

    Joined:
    Feb 14, 2007
    Messages:
    61
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Ellijay, Georgia
    Vehicle:
    1969.5 Maverick
    Hey Jamie,

    Yeah, we can't even get around the bend from the house. I took the carb apart, and made sure the float wasn't set to high. It's set at the spec for the YF, but it does want to flood completely when we step on it going up the hill. The choke appears to be working right. I might try setting the float real shallow and see what happens.......we haven't had a chance to get the car up to speed with the 8" rear yet, so I don't know if it's cool or what yet. We spent the last few days putting new brakes and replacing that emergency cable stuff......speaking of which, it appears we have a missing hook guide. Do you know if there are actually supposed to be two hooks on the underside to guide the emergency cable?
     
  6. 71gold

    71gold Frank Cooper Supporting Member

    Joined:
    Apr 9, 2002
    Messages:
    26,590
    Likes Received:
    2,935
    Trophy Points:
    978
    Garage:
    1
    Location:
    MACON,GA.
    Vehicle:
    '73 Grabber
    been there...went to the Apple Fest. :thumbs2:

    ...Frank...
     
  7. Bluegrass

    Bluegrass Jr. mbr. not really,

    Joined:
    Nov 26, 2003
    Messages:
    515
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Easton, Pa
    Vehicle:
    73 Comet GT, EFI, C4, Posi
    Typical of an old fuel pump that can't keep up feeding the carb bowl with enough gas.
     
  8. tim keck

    tim keck truckdrivintrailertrash

    Joined:
    Jul 4, 2004
    Messages:
    1,991
    Likes Received:
    7
    Trophy Points:
    111
    Location:
    sharps chapel,Tn
    Vehicle:
    '72 Comet, '75 Maverick, '85 F150 4x4 ,'93 F150,'75 F100,'77 Jeep Wagoneer,'91 Dodge D250 Cummins,'90 F150 xtra cab 4x4, '93 F150 4x4
    My '70 had that problem,it was a bad "sock" in the gas tank.Ran good on flat ground/down hill,acted like it ran out of gas going uphill.
     
  9. Earl Branham

    Earl Branham Certified Old Fart

    Joined:
    Mar 9, 2002
    Messages:
    6,367
    Likes Received:
    201
    Trophy Points:
    218
    Garage:
    1
    Location:
    Lugoff, SC
    Vehicle:
    '69.5 Maverick 302, T-5, Grabber Green
    Check the needle and seat, and see if it is in good shape, and has no trash in the bowl, to block the jet. The viton seal on the seat can fall apart and cause the car to flood out, or stick and run the car out of gas.
     
  10. spork1o1

    spork1o1 Member

    Joined:
    Jun 6, 2006
    Messages:
    626
    Likes Received:
    15
    Trophy Points:
    128
    Location:
    Michigan
    Vehicle:
    1972 Maverick
    did you work on the points. sounds like the dwell time might be off.
     
  11. PaulS

    PaulS Member extrordiare

    Joined:
    May 3, 2004
    Messages:
    4,858
    Likes Received:
    12
    Trophy Points:
    0
    Location:
    Seattle area
    Vehicle:
    1966 Mustang, 1972, 73, 73 and 73 Mavericks
    If it only dies under load then check the fuel pump pressure (especially when going up a hill). It should be between 4 and 8 psi. If the pressure is fine but it dies anyway then you probably have a plugged filter sock in the tank. You can fix this by blowing compressed air in the hose going to the fuel pump from the frame with the gas cap off. If you have more than 1/2 tank you are likely to spill some gas so it is best to do this when your tank is almost empty.
     
  12. 71gold

    71gold Frank Cooper Supporting Member

    Joined:
    Apr 9, 2002
    Messages:
    26,590
    Likes Received:
    2,935
    Trophy Points:
    978
    Garage:
    1
    Location:
    MACON,GA.
    Vehicle:
    '73 Grabber
    :hmmm:..i don't understand the...
    ...fuel pump...being a problem...uphill only...:huh:

    (EFI motor, yes/maybe)

    in the past i have driven cars with the
    ...fuel pump hose...dissconnected...:yup:
    poured gas in the carb. vent tube to fill the bowl and fired it up...:thumbs2:

    Frank...:cool:
     
  13. dschrodt

    dschrodt Member

    Joined:
    Feb 14, 2007
    Messages:
    61
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Ellijay, Georgia
    Vehicle:
    1969.5 Maverick
    Checked the float....no acceleration

    We pulled the carb apart again. It is getting way too much fuel in the bowl when you step on the gas going under load. It is leaking like crazy out of the carb down the shaft........Not sure what's causing it. It'd be nice if the thing was "see through", so I could see what that float is doing.........I would think the fuel pump would cut out just sitting there stepping on the gas, but it revs up just fine without cutting out. The thing idles fine and doesn't fill up the carb bowl when not in gear under load....I am at a loss other than maybe it's just time for a new carb. This one was rebuilt, but is apparently hosed up........we have not done the timing or tach and dwell as of yet....looks like I have fuel in the tube to the pvs from the carb......:(
     
  14. 71gold

    71gold Frank Cooper Supporting Member

    Joined:
    Apr 9, 2002
    Messages:
    26,590
    Likes Received:
    2,935
    Trophy Points:
    978
    Garage:
    1
    Location:
    MACON,GA.
    Vehicle:
    '73 Grabber
    if you mean...PCV....

    that's not good...that's a vac. port... if you have gas there you will have gas in the crankcase...


    ...Frank...
     
  15. Jamie Miles

    Jamie Miles the road warrior

    Joined:
    Feb 8, 2005
    Messages:
    12,098
    Likes Received:
    29
    Trophy Points:
    383
    Location:
    Lawrenceville, GA
    Vehicle:
    13 Mavericks
    I'm going to stop by there Saturday. We're going to try a spare known good carb I have and get the timing dialed in.
     

Share This Page