Help requested from quadrajet Gods

[brianangus]

Roadster pickup with stock 85 small block 305 and quadrajet has been fired for first time since massive clean-up and installation from donor car.---All vacuum ports plugged on q-jet except one at rear side which went to power brakes originally-(now is plumbed to pcv valve). starts good, runs well in mid range , but will only run with choke 3/4 on at idle---stupid carburator either doesn't have idle screws, or has them sealed from factory. What do I do now ?  Don't suggest get new carburator---no money for that luxury. There must be something I can do , I just have no idea what.---on an older 4-barrel, I would have monkeyed with the idle screws untill the thing would idle without choke, but on this carb that don't appear possible.--I can put a new needle and seat in, and set the float height, but that appears to be the limit of what I can do----HELP!!!!!

[Fat Cat]

Roadster pickup with stock 85 small block 305 and quadrajet has been fired for first time since massive clean-up and installation from donor car.---All vacuum ports plugged on q-jet except one at rear side which went to power brakes originally-(now is plumbed to pcv valve). starts good, runs well in mid range , but will only run with choke 3/4 on at idle---stupid carburator either doesn't have idle screws, or has them sealed from factory. What do I do now ?  Don't suggest get new carburator---no money for that luxury. There must be something I can do , I just have no idea what.---on an older 4-barrel, I would have monkeyed with the idle screws untill the thing would idle without choke, but on this carb that don't appear possible.--I can put a new needle and seat in, and set the float height, but that appears to be the limit of what I can do----HELP!!!!!

Is this a 85 Model Quadra-Jet? If so does if have an electrical connector on the top? If so it will not work for your application. I do believe that you have a computer controlled carb. They will go full rich with no electrical hookups. We use them on Demo cars for that reason.

[brianangus]

There is no electrical connection on this carb---I took it out of the donor 1985 Pontiac, and there was no electrical connection .

[enjenjo]

Did you try plugging the PCV line to see if that helps?

[brianangus]

Success!!!!!  It seems that the gentleman on another forum who said not to use the power brake vacuum port to my pcv set-up knew what he was talking about.  Today, without changing anything else, I put a pair of vice-grips on the hose and clamped it shut. The car fired right up, and after about 5 minutes warm up, seems to idle much better on its own, without me having to blip the throttle at all. Denny is definately right, in that it needs a gasket and float kit, but it appears that is all it may need.  This is something brand new to me---I never heard of this before, but hey----it worked.  Now all I have to do is figure out what port to use for the pcv. There is a large vacuum port on the front of the carb that used to go to the charcoal canister---I have it plugged right now, but it can easily be unplugged and used----any opinions?

[Crosley.In.AZ]

----any opinions?

I have 2 ,

I wished I would have bought MicroSoft stock 20+ years ago.

Try the port hook up as you post... see what happens.

If you have a leaky vacuum booster , that will cause problems too.

[brianangus]

There is no vacuum booster---that was in the donor car. I just used that vac port on the carb to power my pcv, which apparently was the wrong thing to do.