Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Poor idle
Cliff Ruggles:
Take a look inside the carb at idle speed and see if fuel is dribbling in off the boosters.
Gently place your hand over the carb or "tip-in" the choke flap to see if it idles any better?...
Guadzilla:
Choking it doesn't help. It isn't running rich. Plugs are on the white side.
Cliff Ruggles:
I didn't say to "choke it", just tip in the choke flap or gently place your hand over the primary side of the carb to richen it up just a tad and see if it helps?
If it's lean at idle adding a little fuel shown show some improvement....
Guadzilla:
Ok I'll try that to get it to run richer. I also have a 7028266 carb with rebuilt by Holley sticker on it. I may put it on and see if it idles better with it.
Kenth:
Save yourself lots of headaces, new gray hair and vocabulary NOT using the Holley "Frankencarb", they usually are a pile of mismatching and hacked up parts.
It may idle due to the stupid drilled out idle circuit and plugged idle bypass air but it will never run right at speed with decent fuel usage.
I repeat, the RAIV cam in a 400 will need 15° initial timing.
And your RamAir III, IV, 455 RamAir carb #7040570 will need at least .037" idle tubes and .055"-.059" idle down channel restrictions.
Also, #73 jets with #43 rods will make your car fly.
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