Projects Hesitation off idle

I have a 60 olds with 371 and 2gc carb that I cannot get all the hesitation out of. Carb was rebuilt but still has a problem. can anyone help??

 

first, is your vacuum advance hooked up? is it working?
second, is your accelerator pump squirting gas when you work the throttle?

 

Vacuum leak?
how does she idle?
is it hesitation off idle only under load?
do you have backfire with the hesitation?

 

I' m with Guns wanted here . Generally, I have found this to be within the accererator pump . Rochesters were bad about this . I guess the next thing would be to see how much vacum is pulling too. If you don't have a good pull,, check the fittings and see if the vacum port on the distributor will pull with a hand held vacum pump. scrubba

 

Is it a points and condensor distributor? If it is throw in a new set of points and condensor. check the dwell angle(point gap). Carbs can get blamed when they are not the guilty party. I'm not too familiar with the olds manifold( or plain dont remember) but does it have a heat passage across the dome like the small block chev and is that choked with carbon? ,,worth checking. Ya can't beat having a vacuum guage on a running engine for verifying or eliminating problems.

 

Ditto on the vacuum gauge!!

 

Along with checking for vac leaks look for stuck accel pump check ball (if no spray) peace

 

If pump is working OK try bumping up the timing from the std 5 degree mark to 8-10 degrees
Youll still only have around 36 total
Ive seen this fix many an Olds stumble when engine vacum is on the lower side,or vac advance is lazy
Or some times they just like it that way!!

Tony

 

I have replaced vacuum advance but may need to check again to see if it still works. The accelerator pump squirts but it seems to do it a little late.

 

It idles smooth and the only time it really hesitates is when I stop at a stop sign or light and sometimes when I turn a corner in town. I have had the carb apart and it looks like the accelerator pump housing has some wear on one side. Can you put a sleeve in it for an even wear surface ??

 

If this happens when on the brakes or around corners, I would check the float level.
Too low= starvation Too high gives fuel slosh and flooding with G forces

 

too lean