1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

He-si-ta-tion

Discussion in '40- & 55-Series Tech' started by rgentry, Mar 29, 2004.

  1. rgentry

    rgentry

    Messages:
    693
    Likes Received:
    3
    Joined:
    Jan 19, 2003
    My engine has just started hesitating and stuttering. Hard to get
    up to speed. Here at the details:

    '68 F engine
    great compression, just checked, plugs look good
    new non-USA distributor w/ points and condensor
    new fuel filter, just re-checked to see that it's clean
    new fuel pump, healthy flow at carb

    and ...

    I just replaced the carb with my spare carb to see if it would
    make the stuttering go away. It did not!

    So, what's left? All I can think of is the coil or the condensor.
    Would a bad coil or condensor cause the engine to stutter at
    higher speeds? Note that the engine idles just fine, purrs like a kitten.

    I'm stumped.
     
  2. Elk Hunter

    Elk Hunter

    Messages:
    65
    Likes Received:
    0
    Joined:
    Mar 24, 2004
    Replace the coil (it's cheap). You may want to taka a closer look at your plug wires. When were they last checked? I recently tuned up my 68' FJ40 (stock setup). When I started, I had all kinds of symptoms....I replaced all of the normal stuff (points, plugs, wires, dist. cap, rotor button, ignition coil) and she is running like new. Keep us posted.
     
  3. Jukelemon

    Jukelemon

    Messages:
    2,396
    Likes Received:
    2
    Joined:
    Dec 29, 2003
    Location:
    Louisville, KY
    I did not see timing as a variable checked off. As well, you mentioned high speeds AND getting up to speed. Both or just one?
     
  4. CruisinGA

    CruisinGA

    Messages:
    6,163
    Likes Received:
    12
    Joined:
    Mar 27, 2003
    Location:
    Georgia Tech
    I had high speed stuttering (70<), it was from a worn out distributor that had an oscillating shaft and no vacuum advance.
    Replaced with a late 2F (81-87) electronic, ball-bearing vac advance distributor and now I can run all the way to the top of the RPM range with no stuttering at all.
    Sounds like your problem is more serious though, if it actually gives you trouble just getting up to speed.
     
  5. rgentry

    rgentry

    Messages:
    693
    Likes Received:
    3
    Joined:
    Jan 19, 2003
    Hmm. Some good suggestions here. The distributor is
    brand new so I can't imagine that it won't hold timing.
    The timing was dead on two months ago when I installed
    the new distributor, but I will check it again.

    I think that the plug wires idea is a good one. I did put an
    aftermarket set of wires on last year but they don't look
    that great (and it's hard to tell whether they are "snapping"
    onto the end of the plugs).

    I have a spare condensor so I will try to fix it in this order:
    condensor, coil, wires. I'll let you know what happens.
     
  6. Romer

    Romer fatherofdaughterofromer Moderator

    Messages:
    10,630
    Likes Received:
    1,565
    Joined:
    Sep 14, 2003
    Location:
    Centennial, Colorado
    How old is your fuel filter, if its old and partially clogged it could delay the fuel to the carb. Cheap thing to replace and if you haven't done it in a few years, time you did anyways.
     
  7. rgentry

    rgentry

    Messages:
    693
    Likes Received:
    3
    Joined:
    Jan 19, 2003
    Fuel filter is AOK. I can blow right through it.
     
  8. IDave

    IDave

    Messages:
    7,168
    Media:
    1
    Albums:
    1
    Likes Received:
    21
    Joined:
    Jan 3, 2003
    Location:
    McCall, ID
    I like the checking timing and replacing plug wires suggestions. I agree that a new dizzy is unlikely to wobble.

    You might try setting the timing using the max vacuum method, rather than the timing ball. I find my NonUSA dizzy likes a fair amount of advance to run well. Also, what is your dwell angle?
     
  9. Jukelemon

    Jukelemon

    Messages:
    2,396
    Likes Received:
    2
    Joined:
    Dec 29, 2003
    Location:
    Louisville, KY
    What type of carb? What type of air intake system? Perhaps your choke cable is not not shutting the choke all of the way i.e. fuel system is starving for air. It sounds like you have ruled our fule delivery and ruled out spark. All that is left is air or lack off.
     
  10. Jukelemon

    Jukelemon

    Messages:
    2,396
    Likes Received:
    2
    Joined:
    Dec 29, 2003
    Location:
    Louisville, KY
    I really need a spell check or typing lessons.
     
  11. rgentry

    rgentry

    Messages:
    693
    Likes Received:
    3
    Joined:
    Jan 19, 2003
    FIXED.

    Points in the new distributor were almost completely
    closed. Had they completely closed, the engine
    would not have run at all, and I would have found
    the problem quickly. As it was, the stumble really
    had me thinking it was a fuel problem, but of course
    it was not.

    Thanks everyone, and remember, don't overlook the
    obvious stuff.
     
  12. CruisinGA

    CruisinGA

    Messages:
    6,163
    Likes Received:
    12
    Joined:
    Mar 27, 2003
    Location:
    Georgia Tech
    Never forget:
    If you think its a fuel problem, check the ignition.
    If you think its an ignition problem, check the fuel system.