Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Poor idle

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Guadzilla:
Working on a 70 trans am q-jet 7040270.  Poor idle and lots of movement on vacuum guages.  While running if I close off the bowl vent for an instant the engine shuts down like I tuned off the key.  Should there be that much vacuum in the bowl.

Cliff Ruggles:
Which "bowl vent".  The bowl on that carb vents in at least 4 places.......

Guadzilla:

--- Quote from: Guadzilla on January 30, 2021, 02:18:06 PM ---Working on a 70 trans am q-jet 7040270.  Poor idle and lots of movement on vacuum guages.  While running if I close off the bowl vent for an instant the engine shuts down like I tuned off the key.  Should there be that much vacuum in the bowl.

--- End quote ---

Guadzilla:
The 3/4" vent on the front that pokes through a hole on the lower air cleaner plate.  Plug it and it kills the engine instantly

Kenth:
Is this a 7040570 carb?
No such vent on a 7040270 unit.
Either way, no vacuum in float bowl, only atmospheric pressure.
Pictures?

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