Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

301t Won't idle

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canadian nascar:
Hi Cliff,

with the APT screw in is rich out is lean. I would like to know is for every full turn in how much of a jet size might i be increasing? or is it not known?

thanks kevin

canadian nascar:
Hi Cliff,

read abit closer and understand the apt raises the rods not creating larger jets.

i was talking to a fellow 301t and he has 110 needle and seat are these avalible? and also you made a pair of secondary rods last year for me like dx rods but he is running ay rods which are richer?

removed my idle tubes and drilled them, the recipe you offered was #2 i didnt find .038 drill bit but found a .042 and tried it and it seems fine. it idles now in park and almost in gear, i just have to adjust the idle speed and screws abit more.

Cliff Ruggles:
We have .110" seats, .125's, .130's, .135's, .145's and .149's.

We also sell new idle tubes in any size you would want....Cliff

canadian nascar:
Hi Cliff,
if the local boys can get me .145 needle seat will this give me any problems or should it be more application specific?

i am trying to learn how to make sure the secondaries are opening all the way. i have read from your book that emisson carbs like like mine are restrictive. so i might have some questions on that one.

thankyou kevin

canadian nascar:
hi Cliff,

i am looking to open up the secondaries as i have some pinging and want to make sure i am getting all the fuel i can.
could you lead me the right way,

k hanger, custom dx and 77 in the primaries.

can run 5-6 lbs with gas only, did a test with water meth off, normally run 12lbs with water meth injection

thanks kevin

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