65 289 carb question Please

Woody3882 · Oct 24, 2018

I have a 1965 Mustang with a stock 289. I just installed a new Holley 2 barrel model 350. I went with a manual choke. My problem is that the idle is running at 1200-1500 rmp. I turned the curb idle screw completely out and it makes no difference still 1200-1500 rpm. I have tried different scenarios, warm motor, cold motor, and with the throttle plate in various and in its appropriate position. So my question is what would cause the idle to rev so high with the adjusting screw turned completely out.
I appreciate any input anyone can give, I am at a standstill....
Thanks
Woody3882@aol.com

rbohm · Oct 24, 2018

make sure the fast idle cam is in its lowest position when the choke is open. also make sure the speed screw for the fast idle is set properly as well and isnt affecting the idle speed when the choke is open.

Woody3882 · Oct 24, 2018

correct me if I am wrong, but with a manual choke there is no fast idle cam, or is this where my problem is. I have never used a manual choke .

The Shemdogg · Oct 24, 2018

If u have a vacuum leak itll idle high too

shem

rbohm · Oct 25, 2018

Woody3882 said:
correct me if I am wrong, but with a manual choke there is no fast idle cam, or is this where my problem is. I have never used a manual choke .

even a manual choke has a fast idle cam.

WORTH · Oct 25, 2018

Ditto ;Could be the high idle step or a vacuum leak.

Woody3882 · Oct 25, 2018

Update: I got an electric choke and have the car running,
Last Question: The high idle screw on the holley 350 is to the rear pass side of the carb. Does turning the adjusting screw clockwise or counter clockwise decrease the high idle speed. Another way to put it, is it set up the same as the curb idle screw. c/w to increase & ccw lower.
Everyone has been very helpful and I do appreciate it
Thanks
Woody

Woody3882 · Oct 25, 2018

I just found out what the problem was. I pulled the carb again and found that the tab that rests against the idle cam was bent and not making contact with the cam, thus not releasing from high idle. Problems seem so simple once you find the answer.
Thanks to all for your reply's
Woody

65 289 carb question Please

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