Qjet idle rich.
 

GM 1980 305 w/ stocker cam, 2-3 inch vac.
I cant get a good idle, it loads up and it falling over about 90 ft. out then pickup a sec. later.
The carb was built by a local SS racer a few years ago. It has the pri. rods removed.
I have to have the throttle open a lot of turns to keep it running.
The fuel is being pulled from the mains and the idle screws have little affect.
I have tried other Q jet carbs, even a new Jet stage 3.
I guess the question is, how do I get this to run right.

Re: Qjet idle rich.
 

Fuel pressure?

Re: Qjet idle rich.
 

Fuel pressure
Started at 7psi I how have it set at 3.5psi.
Float is at 1/4 " , have changed float and needle & seat.

Re: Qjet idle rich.
 

Did this carb ever idle on your car? When you tried the other carbs did they work properly?

Re: Qjet idle rich.
 

Did any carb ever idle on this engine??

Are the primary blades drilled??

2 or 3 inches of vacuum is nothing??

You might have engine problems and not carb problems..

Such as vacuum leaks, cam timing, damaged valves or too many to list..

Just sayin'

Re: Qjet idle rich.
 

Carb worked on bracket 350. but w/ south a year later. Have rebuilt ,cleaned and blow it out. but has no
I have tried 3 other carbs on the 305.
problem on 3 different motors, all low vac motors.
smoked all the motors, no leaks, leak down good. plates drilled.
the motor will run with a Holley.
put a Jet 3 on this motor and still the same.

Re: Qjet idle rich.
 

Are you sure you have the right gasket between the carburetor and intake manifold?

Re: Qjet idle rich.
 

I have looked at the gaskets but, I maybe should look at that . thanks

Re: Qjet idle rich.
 

Yes to this...there is a base gasket out there that is the mirror opposite of what is needed. Will cause a huge vacuum leak for sure.

Re: Qjet idle rich.
 

a huge vacum leak will cause it to be rich? I thought I would make it lean...