Stumped and Frustrated with a Holley 670 Hesitation
So I slowly opened the throttle and the gas trickled out of the squirters. Then I gave it a quick bump to say half throttle and gas did squirt, and appeared like it was instant. So at half throttle still, I bumped it again to 3/4 throttle, appeared to be about the same. I noticed from about 3/4 throttle to WOT the pump lever didnt move at all. It was riding on the flats of the pump cam and no longer pushing down. I repeated this a few times and it all seems to be about the same each time I did it. So I need to ask a few questions to make sure Im doing it correctly. When you guys say to do this do I do it fast or slow, like if Im going to WOT or just easing into WOT? Do you have one that you recommend? I've seen these mentioned in other posts and have looked at them but there are so many I wouldnt have a clue on what I would need.
Would you think the very first shot was as strong and immediate as the following strokes?
Try and imagine your foot motions on the gas pedal when it hesitates,, and try to reproduce that motion at the carb,.. You can try this with the car running,, but keep your face to the side,, and not over the carb,, where a backfire may singe your eyebrows, pls br real careful here,, safety glasses a must,., a mirror is helpful here..(if the car never backfires, you're relatively safe..)
I have 2 thoughts,,
As mentioned previously ,, there's a small needle underneath the squirter,, if it's not seating,, the fuel will drain back outta the squirter creating a void/hesitation, that the pump has to fill before it can squirt.. To try and remedy that,, take the squirter out, and you shoud see the needle sitting in the squirter hole,, if you have a small punch, you need to give the needle a
light tap a coupla times to re-seat the needle..
Also if the squirter gskt leaks, same deal,, drains squirter..
2nd, and drove me nuts half a day,, is in the accelerator pump cavity, (take the diaphram off) and there's a small shiny ball captured by a metal strap,, make sure that there no crap stuck in there,, and more importantly, is that the strap holds the ball almost snug,, if the ball appears to have quite a bit of motion off the seat,, tighten it up by adjusting/tapping the strap.. That ball,, if left really loose,, will cause a healthy hesitation,,, Readjust the linkages to no slack,, and cross your fingers,, .lol
as always... hope it helps
