Is my choke working?
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Logistics Pro
Joined: Mar 2001
Posts: 4,157
Likes: 3
Is my choke working?
78' F250 with 400 motor all stock. The engine fires up really fast and easy, problem is it idles at the normal low rpms when cold and sometimes wants to die-depending on how cold it is outside. Shouldn't the choke keep the rpms up while it's cold? What can I do to check to see if the choke is functioning correctly? Thanks.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The choke itself doesn't keep the idle up - the fast idle linkage does. The fast idle linkage is engaged and disengaged based on the choke plate position. You can tell if your choke is working very easily by pressing the gas pedal once while the motor is cold, then pulling off the air cleaner and seeing if it's shut. The choke, pulloff, and fast idle mechanisms on a stock Ford 2 barrel are actually pretty complex, and many elements are often overlooked. If your truck starts well when cold but can't idle, it sounds like your fast idle index is off. I have two writeups for you:
Here is how to set it up (you want the fast idle index and speed parts):
https://www.ford-trucks.com/forums/7...ml#post6422219
Here is some reading to explain the point of everything:
https://www.ford-trucks.com/forums/8...ml#post6939116
Hope that helps. Let me know if you have further questions.
Here is how to set it up (you want the fast idle index and speed parts):
https://www.ford-trucks.com/forums/7...ml#post6422219
Here is some reading to explain the point of everything:
https://www.ford-trucks.com/forums/8...ml#post6939116
Hope that helps. Let me know if you have further questions.
