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08-05-2014, 06:46 PM | #1 |
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Location: Knoxville, TN
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Quadrajet Choke Question
We got my buddy's 69 c20 running and driving but it does not want to idle for anything. I don't know if it will idle once it warms up since we have not be able to get it hot. I noticed that the choke does not seem to shut all the way and when the engine starts the choke does not slowly open, instead it just flaps around. Does the part I circled need to be attached to a 12v source? The motor is a 350 from around 86 with a stock intake.
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1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/ |
08-05-2014, 07:27 PM | #2 | |
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Re: Quadrajet Choke Question
Quote:
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08-05-2014, 07:30 PM | #3 |
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Re: Quadrajet Choke Question
That's my problem I try not to work on quadrajets, I prefer Holleys. I have seen others without it hooked up so I wanted to double check.
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1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/ |
08-05-2014, 07:34 PM | #4 |
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Re: Quadrajet Choke Question
On my 84 theres a positive wire on the choke
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08-05-2014, 07:36 PM | #5 |
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Re: Quadrajet Choke Question
Hello Yes that is were 12v is hooked up but there are adjustments that need to be made as well. The voltage expands the coil (spring) and moves the choke plate if it is hooked up.
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08-05-2014, 07:45 PM | #6 |
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Re: Quadrajet Choke Question
I will hook it up to 12v and recheck it. I know on Holleys the negative wire also connects to the choke, but I don't see a spot for one on this carb.
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1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/ |
08-05-2014, 07:49 PM | #7 |
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Re: Quadrajet Choke Question
The ground is thru the housing.
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08-05-2014, 08:31 PM | #8 |
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Re: Quadrajet Choke Question
Even with the wire hooked up, as it's supposed to be, it shouldn't just "flap around". Something else is amiss, like Fitz said, the bi-metal spring might not be on the choke shaft. Check that first, it's the easiest; but if it has rivets instead of screws holding it together then they would have to be drilled out and replaced with screws. Next, the arm from the choke butterfly going down to the choke shaft could be either gone or off the Bottom part that floats on the choke shaft, look at your picture for what to expect to see on the top half. It's kinda tricky to get on if you have had the carb apart but have patience. Yes, I'm a "Q-Jet Man". LOL
Last edited by mechanicalman; 08-05-2014 at 08:37 PM. Reason: all-on |
08-05-2014, 08:47 PM | #9 |
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Re: Quadrajet Choke Question
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08-06-2014, 12:50 AM | #10 |
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Re: Quadrajet Choke Question
Hey now! None of that "Holley Folly" LOL
Worked at GM dealers for years, anything gets easy after you do it enough times in a row. Actually I like AFB's and AVS's the best; they are the simplest and easiest IMO. I rebuilt an AFB on my Pontiac when I was 17 and it actually worked. Never got into Holleys, but they are the most popular racing carb in history, IMO. You tend to like whatever you cut your teeth on, you know, nothing is better than Mama's cooking! |
08-06-2014, 07:05 AM | #11 |
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Location: Greeneville Tn
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Re: Quadrajet Choke Question
Tons of info here,helped me get mine right.
http://www.florida4x4.com/tech/quadrajet/index.php |
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