when going from an idle and punching the gas my engine hesitates for just a second and then continues to rev up. it only does it when it sits at an idle for a little bit. its annoying and its always done it. ive had my carb rebuilt twice since it has started. the 20 year toyota certified master technician who rebuilt my carb said it is the little teflon balls in my carb that are unreplaceable. they are basically there because toyota says they're there. and they are getting stuck causing my engine hesitation. now it would seem my only options are a brand new carb, rebuilding a junk yard carb and praying that ones not junk too, or a magical fuel or carburetor treatment the clean and un-stick the balls or valves forever. ive heard that the 'Seafoam' stuff works miracles. but something that can be an additive in just about every spot to put it seems kind of shady.

any ideas?

 

seafoam actually does work pretty well, you could try lucas additive or something else if you want to try a cheap fix. i honestly have no idea if it would help or not but anyhting is better then going with a new carb. but if you do decide to go new go with a weber and not another aisen

 

My '84 22R does this too, but only if I am driving at little throttle, and punch it to the floor. it hesitates before it kicks in. if I go smooth and easy to the floor , no hesitation, but if I floor it, it hesitates. I deal with it, just dont punch it. lol.

 

Try checking the AAP system. There is a valve that shuts it off when the motor is warm. If the valve is not sealing completely, then it will build up vacuum at idle and then dump in the extra fuel when you step on the gas, causing a rich mixture and possibly a slight hesitation.

The quickest way to see if that is the problem is to just pull the vacuum line, plug it, and see if the problem goes away. If the problem goes away then you know where the problem is. Do not leave it plugged because it will cause a slight hesitation when the motor is cold.

 

rocko taco it looks like we're cursed with the same disease. i'll try checking the AAP system. the hesistation seems like the carb could be flooding for a second. it does it wayyy worse when the motor is cold. if that makes any difference.

 

The AAP is suppose to give it extra gas when the motor is cold, meaning that it should run normal when cold if the AAP is always on. If it is already running rich, plug the AAP and it should run better cold.

My old Subaru had a hesitation like the one you are describing and it turned out to be a worn distributor bushing. When the motor is cold, take off the distributor cap and see if the shaft wiggles. If it wiggles, the bushing is bad. I doubt that is your problem, but it is easy to check.

Also check that the acceleration pump is working. I would assume it is if the carburetor was rebuilt correctly. With the motor off, look into the carburetor and open the throttle. Gas should squirt into the primary throat while the throttle is opening.

Another thing to check is the timing. Adjust it with both vacuum advance lines disconnected and plugged.

 

my 84 22r has the same hesitation. I increase the idle to about 950 -1000 and the hesitation is gone.