Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

an unexpected case of nozzle-drip

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Marx3:
I can cover the secondary air flaps with a rag and it doesn't affect the idle. This leads me to believe the secondary plates are fully closed. Besides, I centered all four plates 2-3 times and the linkage is adjusted too.
Everything seems to be in order.

omaha:
at what rpm does it idle at. Just wondering. PCV? Bad brake booster? Does it have bypass air?

Marx3:
idles at 1000-1100.
Put it in gear and do some lively driving, rpm seems to drop to about 7-800. still with the plates fully closed.
The owner took the car for a nice long cruise yesterday and now it idles up around 1000 rpm again, but erratically.
I had a similar problem with a Qjet on a different cadillac 500 engine. also stock everything.
the secondaries would come off center, once the throttle had been stabbed, causing an erratical idle. I discovered it doing a last ditch attempt to cure the problem.

77cruiser:
Is the throttle arm tight on the shaft?

Marx3:
you mean the arm that the cable is attached to?
Yes sir. Nothing seems out of the ordinary...
I am getting the carb tommorow. Ill try a known working baseplate and see if that cures the problem.
Apart from this idle-problem, the carb performs perfectly.

We have had the engine idling with every vacum-appliance unplugged. PCV, brake booster, EGR, VA, transmission, heatriser, cruisecontrol, levelride, A/C, you name it.
Baseplate has .045" bypass

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