Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
17056228 First Test
blazer74:
Try the punch trick and reduce hole size, try different pump? Seems to be what I'm finding in search.
Craig
Cliff Ruggles:
I would lean it up some in lieu of trying to reduce accl pump shot......Cliff
blazer74:
Ok, Will try smaller jets. Off subject question, what would cause one carb to produce 14 hg at idle and another to cause 15 hg at idle same engine and idle rpm? Craig
Cliff Ruggles:
Idle bypass air, amount of fuel available to the engine via the mixture screws, etc.....Cliff
blazer74:
Ok, Finally got back to carb. dropped down to 70 jets with all else remaining the same. This took care of too much pump shot. apt at 5 turns out with tip in. noticed that any less than that also lowers rpm speed during tip in and at idle speed. Mix is 5.5 turns out, less than 5 idle drops, more than 6 no change. Have slightly unstable and rough idle which I didnt have before I bushed the main air bleeds, acts like it has more camshaft in it than it does. lightly black tailpipes after driving a few times. Cant get as much idle vacuum or smooth idle with this carb vs my other carb 17057204 (large Mains) 77/52k other wise set up the same (stage 1). Did not check for nozzle drip. otherwise runs good. Idle will smooth some when closing choke to about 1/4 open. I have no vacuum leaks, ported dist vacuum. Pulling vacuum line of makes no noticeable change.
70/ Cliffs 44 rods
80 bypass air
036 tubes
047 channels
800 carb
main air bleeds 070
lower air bleeds 076 upper idle bleeds 069
base plate re-bushed. 089 mix holes
What do you think? Thanks Craig.
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