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Posted: 11/11/2001 2:30:17 PM EDT
[#1]
Have you got the vacuum choke pull-off hooked up, adjusted and working?
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Posted: 11/11/2001 2:39:16 PM EDT
[#2]
It's hooked up, but the diaphram is a little stiff. I'm not at home so I can't really look at it. Is this thing connected to the the fast idle parts? The only carb experience I have has been with Holleys, so I'm a little in the dark.
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Posted: 11/11/2001 2:43:40 PM EDT
[#3]
Look to see which screw is holding the throttle shaft open. There is one to adjust off the fast idle cam, and then your regular idle screw.
If niether screw is making contact, check your linkage for corrrect travel. If its a vac. secondary, check that no lines are rubbing on the op rod ( holding them open a bit) |
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Posted: 11/11/2001 2:47:35 PM EDT
[#4]
The pull-off works against the choke/fast idle.
After a while, it overcomes both the choke and fast idle, and allows the throttle to sit on the slow idle stop. Sounds like you have some basic adjusting to do, if everything's working OK. Get out the installation instructions, (or get a new set) and start reading. Sounds like a set-up maladjustment problem. You can fix it, just go one step at a time. |
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Posted: 11/11/2001 3:01:46 PM EDT
[#5]
the pull-off is a small vacuum actuator on the side of the carb, correct? So, if its diaphram is rather stiff, it may fail to sufficiently pull?
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Posted: 11/11/2001 3:12:08 PM EDT
[#6]
Correct. It looks a little like a flying saucer type thing. You should be able to move the diaphragm with just applied finger pressure.
I'm assuming that the vacuum is constant, and not controlled by a temperature sensitive valve (usually a black plastic cylinder) which might be bad. If so: step one: buy or borrow hand-operated vacuum device, hook it up to pull-off, and see if prob goes away. If so, prob is vac source. |
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Posted: 11/11/2001 3:13:02 PM EDT
[#7]
My advice is to lose the Quadrabog for a Holley....difference is like night and day
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Posted: 11/11/2001 3:28:51 PM EDT
[#8]
That's another story, Hundah. Let's get this guy over the hump first. [;)]
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Posted: 11/11/2001 3:58:29 PM EDT
[#9]
Quoted: My advice is to lose the Quadrabog for a Holley....difference is like night and day I have an intake with a spreadbore flange and cannot use an adapter plate b/c it will screw up the clearance for the cowl induction set up. |
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Posted: 11/11/2001 5:30:11 PM EDT
[#10]
I've seen this before many times. It's usually caused by a bad ground for the carb (choke) through the spacer/manifold. Try running a ground wire from the choke to the block.
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Posted: 11/11/2001 8:05:01 PM EDT
[#11]
Just put a 650 CFM Edelbrock on my friends bronco and it does the same thing. Although it cuts down after about 5 mins or if you drive it for a short time. Also if you are going to replace it with anything get a Demon. Hunduh, I think that is the first time I have ever heard anyone recommend a Holley for street use! IM sure if you get the Edelbrock adjusted it will serve you well.
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Posted: 11/11/2001 10:52:25 PM EDT
[#12]
Quoted: I've seen this before many times. It's usually caused by a bad ground for the carb (choke) through the spacer/manifold. Try running a ground wire from the choke to the block. This was stated to me by my old boss (guy I used to work for in high school). Just one question, grounding the choke to the block would be euqally, if not less effective, than gounding it straight to the negative terminal of the battery, correct? I tried this and the damn thing didn't open any faster. My first guess was that the electric choke wasn't getting enough voltage. I haven't tried grounding it to the block b/c I grounded it to the negative terminal of the battery first, assuming that would be more effective (the positive lead comes from the ignition circuit, so the choke isn't getting power unless the car is running). |
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Posted: 11/12/2001 9:40:40 AM EDT
[#13]
In that case I'd check the sending unit.
Basically what you have is a power wire going to the choke, and the other wire goes to ground through the sending unit. Take the wire off the sending unit, and with the ignition turned on, ground the sending unit wire to the block, then lift it. You should be able to see the choke open and close. If it does, replace the sending unit. If not, the problem is in the choke itself. It sounds like you might have used the sending unit meant for a guage instead of a choke. |
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Posted: 11/12/2001 3:57:52 PM EDT
[#14]
Hold the choke open with your fingers with the engine running then snap the throttle open by hand. If it idles down the fast idle and curb idle settings will be ok. This test kinda takes the choke out of equation. If it still idles fast check the fast idle screw on the choke side and curb idle screw on the linkage side. Dont know if you got a electrical or vacuum solenoid that could increase the idle speed. If so disable it then check again.
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