Fast idle choke adjustment
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Senior User
Joined: Feb 2013
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Fast idle choke adjustment
I just put a new carb on my 360fe (Autoline= 2100 motorcraft) and can't figure out the fast idle setting on the choke. I know, how sad is that, such a simple design but its kicking my butt 
Even though its summer out right now with the cold spell its getting down in the low 60's at night. I've always wanted to get the truck set where I could push the gas pedal down once and have the truck start and warm up for me so I wouldn't have to sit in a cold truck and jack with the throttle for 5 minutes just to get it to idle in the winter.
This is how I've try to adjust the fast idle so far. With a cold engine off turn the choke thermostat back until the choke is almost closed just enough space to let some air get threw. Then try to turn the screw on the back of choke to set the throttle to a fast idle about 1200 rpm when engine starts. The problem is the truck wont start unless I pump the gas a couple times and give it a few blips of throttle after start to get it going. By that time the fast idle has already released itself and I'm back on normal hot idle. What am I over looking guys? Truck seems to be alittle cold natured and acts like it needs alittle choke for the first few minutes of start up.
Even though its summer out right now with the cold spell its getting down in the low 60's at night. I've always wanted to get the truck set where I could push the gas pedal down once and have the truck start and warm up for me so I wouldn't have to sit in a cold truck and jack with the throttle for 5 minutes just to get it to idle in the winter.This is how I've try to adjust the fast idle so far. With a cold engine off turn the choke thermostat back until the choke is almost closed just enough space to let some air get threw. Then try to turn the screw on the back of choke to set the throttle to a fast idle about 1200 rpm when engine starts. The problem is the truck wont start unless I pump the gas a couple times and give it a few blips of throttle after start to get it going. By that time the fast idle has already released itself and I'm back on normal hot idle. What am I over looking guys? Truck seems to be alittle cold natured and acts like it needs alittle choke for the first few minutes of start up.
Laughing Gas
Joined: May 2006
Posts: 1,140
Likes: 13
From: Port Orchard Wa
The fast idle adjustment screw rides on a cam. When you push throttle to floor choke closes and the cam rotates and engages the fast idle. The cam should stay rotated until the engine heats and the choke opens. Then when you punch it the cam drops and you go back to normal idle. As long as you're still choked you should be able to pump the peddal and not affect the fast idle.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
march's description is 100% accurate. Please read the following description with regard to setting up the fast idle linkage:
https://www.ford-trucks.com/forums/7...ml#post6422219
https://www.ford-trucks.com/forums/7...ml#post6422219
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Senior User
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Thanks for posting. I read it over a couple times and prolly will reread again before I tune on it again. My choke is a hot air choke. Would there be any different steps I need to know or over look?
Tuned
Joined: Aug 2011
Posts: 282
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fmc400, could you look at my problem? I know it's a different setup but I'm totally stumped!!
I put a video over in the carb/fuel board. I haven't gotten the help that I need, though.
https://www.ford-trucks.com/forums/1...t-setting.html
I put a video over in the carb/fuel board. I haven't gotten the help that I need, though.
https://www.ford-trucks.com/forums/1...t-setting.html
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Senior User
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In you post you linked you mentioned a pull off behind the choke thermostat mine dosent have that. Didn't know if the steps you listed would matter.
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Posting Guru
Joined: Sep 2003
Posts: 2,313
Likes: 12
From: Northeast LA
If yours doesnt have the pull off behind the choke thermostat then its on top of the carb behind the air horn.
Just to add a pic.
Where this says choke diaphragm, thats the pull off.
Just to add a pic.
Where this says choke diaphragm, thats the pull off.
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MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
A 2100-series carburetor should have the choke pulloff mounted vertically, behind the throat of the carburetor. A 2150-series carburetor should have the pulloff mounted horizontally, on the passenger side of the carburetor. The concept is the same in either case. The pulloff is a crucial piece of setting up the carburetor properly.
Mountain Pass
Joined: Oct 2015
Posts: 215
Likes: 4
From: Buffalo,Tx.
One very big problem I see is there has been no mention of what kind of transmission he has.
Or I missed it.
Moore31 do you have the AOD transmission?
If you do there will be some problems with carb selection.
Or I missed it.
Moore31 do you have the AOD transmission?
If you do there will be some problems with carb selection.
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