idle speed screww
 

Hi everyone
The idle speed screw on my 52 v8 has no effect on the idle speed. My thought would be the linkage to the carb. Ive adjusted the threaded linkage closest to the carb but it seems I'm too close to the end of the threaded rod. Is there an adjustment at the other end of the rod? Otherwise what do you suggest I try?

Re: idle speed screww
 

If the rod adjustment doesn't get it, try taking the linkage off at the carb and see if the arm on the throttle shaft can move any futher closed. If that is not it might have to check that the throttle plates are centered correctly and closing all the way. If the throttle plates are open very far the idle would be high. If everything with the throttles is ok I would suspect an internal fuel leak.

Re: idle speed screww
 

Likely as not, the idle fuel passages are partially blocked up. The idle screws only adjust the mixture but the rpm does increase as it gets closer to the correct mixture. If you close them both off and it's still running, you may have an internal leak due to a blown or leaking power valve. You should be able to kill the engine if you close them off too much.

Re: idle speed screww
 

Hi! Gents
I took everything apart. There is without a doubt, some slop where the plate with the seasonal holes is pressed into the throttle shaft ,which I will address once the driving season comes to a slow halt. I readjusted the threaded shaft to the carb and adjusted the anti stall dashpot which had a bearing on my problem. So right now, everything seems to be working correctly. All of these movable parts interact with each other and have to be in sync. That was my learning point for the day. Thank you all for your valuable input!

Re: idle speed screww
 

My reading comprehension was not so good yesterday. Too much sun on the tractor I guess. Yours must have an automatic if it has a dashpot. It's further complicated by the TV operating mechanism when you have an automatic transmission.

Re: idle speed screww
 

Rotorwrench , you lost me! What is a TV operating system?

Re: idle speed screww
 

Geez. I thought everybody into old Ford carbs knew that all digital TVs must have an operating system or they won't boot. Jack E/NJ

Re: idle speed screww
 

Hey JACK E, I like your humor! Now that I fixed my problem I can laugh out loud!

Re: idle speed screww
 

Check the idle screws for damage from over tightening. The point of the screws should be free from the "rings" made by clinching them down into the seats. Idle screws should always turn down easily by hand before final adjustment to confirm the threads are clear.

Re: idle speed screww
 

TV is a throttle control valve. It controls the transmission pressures and the governor controls the the shift speed. All the old Ford-O & Merc-O-matics were set up this way. It's not just a kick down set up even though it will make it kick down when it goes to full throttle.

It's just part of the throttle linkage on old ford automatics.

Re: idle speed screww
 

Thanks Supereal and Rotorwrench. For a minute there I thought Verizon was offering a free upgrade! Im ok for now! The adjustments I made seem to have solved my problem!

Re: idle speed screww
 

The later mustang (and other Fords) AODs use a similar setup, just a cable vs a rod.

Re: idle speed screww
 

I would take the throttle linkage right off the carb. Then you can tell if it's a carburetor issue or a linkage issue.