Divorced Choke Quadrajet Question
Thread Starter
8th Gear
Joined: Aug 2012
Posts: 8
Likes: 0
Divorced Choke Quadrajet Question
Have a 73 with a coil divorced choke quadrajet. I am not familiar with the sequence of operations for the carb so I will let you know whats happening and you tell me.
My problem is that I can get it started, but wants to die for for the first 3-4 starts. On start up if I press the gas or just let it idle it will die for those 3-4 times. Have to give it 5-8 min to smooth out.
(removed air cleaner to watch carb)
Start 3-4 times until it will stay running. Press gas each time on start to close choke, and as soon as it starts the choke is completely released and primary opens all the way up. It will idle after the 3-4 starts until warm and then it is good to go.
If I manually close off the primary and press accellerator no problem, so my question is should the choke stay on longer?
My problem is that I can get it started, but wants to die for for the first 3-4 starts. On start up if I press the gas or just let it idle it will die for those 3-4 times. Have to give it 5-8 min to smooth out.
(removed air cleaner to watch carb)
Start 3-4 times until it will stay running. Press gas each time on start to close choke, and as soon as it starts the choke is completely released and primary opens all the way up. It will idle after the 3-4 starts until warm and then it is good to go.
If I manually close off the primary and press accellerator no problem, so my question is should the choke stay on longer?
Drifting
Joined: Jan 2002
Posts: 1,645
Likes: 11
From: Schaumburg IL
Get the book by Doug Roe on Rochester Carbs. I would say Your problem is the vacuum break is too big on a cold start. Take off the air cleaner, pump it at the carb 2-3 times and reach around and start the car. Look at the gap on choke butterfly right after start. It should only be about 1/8 open or too much air comes in. The book will walk you through the procedures to adjust out the divorced choke and besides the book will come in handy for the future.
Le Mans Master
Joined: Oct 2010
Posts: 6,937
Likes: 848
From: melbourne florida
2023 C3 of the Year Finalist - Modified
mine has no choke , lived in northern Virginia now in florida.in either case summer or winter pump gas twice turn key car starts and runs till i shut it off. on very cold days i would let it run a short time to make it easy on it. i think even cliff says a choke isn't necessary. not saying its for you but shows the possibilities .
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Your choke is not adjusted correctly. Upon startup, the choke should crack open 1/4", and the engine should easily stay running. If it's opening all the way, the adjustments are way off. Set the choke up per the adjustment procedure in my Q-Jet Setup paper - there is an entire section devoted to step-by-step choke adjustment. Just e-mail me for a copy.
Lars
V8FastCars@msn.com
Lars
V8FastCars@msn.com
Thread Starter
8th Gear
Joined: Aug 2012
Posts: 8
Likes: 0
Just wanted to let you guys know that problem is fixed now. Thanks Lars for sending me all the info. The vacuum pull off spring was hanging up not letting the choke coil close the primaries.
Works great now
Works great now
