I have a '69 Galaxie with a 390-2V that hesitates when you first press
the accelerator pedal. After the stumble, it catches on a runs very
strong and smooth, so something is just wrong in the initial tip-in of
I have a nearly new Pony Carbs rebuilt Autolite 2100 in there . . have
carfefully timed the car for a smooth fast idle and high vaccum. It
doesn't seem like a mixture or choke problem, and since the idle is
smooth I don't think it's a vaccum leak.
Does anyone have any ideas/experience in solving this?
The method you describe will usually lead to excessive advance.
Use the timing marks on the harmonic balancer, get a strobe and
do it right. Once you have it timed, then you could think about
fiddling with the carb, but you apparently already have, so I don't
know where that leaves you.
fine adjustment. The accelerator pump arm on some was slotted for more coarse
adjustment. Smallblocks were pretty easy to adjust the pump stroke on because
just rev so quickly. FE motors were touchy about accelerator pump, vacuum
initial timing settings because they reved up slower. Those engines would
acceleration if the moon wasn't in the right phase or the temperature wasn't
right ;) This was a Ford thing on many engines through the 70s, but was most
on the FEs. It can be fixed with some diligent tuning, at least for a little
As a rule GM cars didn't suffer from this problem, but I remember some of the
60s and early 70s HP and PI Ford motors that used the Rochester Quadrajet that
had stumbling problems.
If you drive an old Ford with an FE motor, you learn how to wiggle your foot
takeoff :) How much depends on your tuning ability.
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