Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

lean spot when coming into the secondaries

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Cliff Ruggles:
Secondary POE is the system that feeds fuel to the top of the airhorn and delivers it to the engine thru the holes just above the flaps.  Some models have the holes in line with the flaps, others have them under the flaps, but they all do the same thing.

The restriction to the wells control the fill time.  When the secondaries first come on line the quick vacuum differential above/below the flaps pull fuel from the POE system and help to eliminate a momentary lean condition.  The engine also gets some POE fuel from the main nozzles from what fuel is in the passages just under them......Cliff

Marx3:
When you say "opening up the poe holes", which holes of the holes in the poe circuit are you referring to?
The one up by the flaps or the ones down in the bottom of the poe tubes?

Cliff Ruggles:
The fill holes are for the wells, the discharge holes are in the airhorn.

The fills holes determine fill rate, discharge holes determine how quickly the fuel in the wells is delivered to the engine.....Cliff

Marx3:
Gotcha. So in order to address a lean secondary spot, I make sure the fill-rate is proper (holes at .040 ) and then try and up the size of the discharge holes. ?

Cliff Ruggles:
I would only open up the feed holes.  One change at a time is always best with these things......Cliff

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