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08-10-2014, 11:43 PM | #1 |
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Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Hello again, all,
I'm going though WAY too much fuel, just recently found out that my carb was barely even on the engine (no idea how or why), but now she's running way too rich, I found the idle speed adjuster screw next to the throttle pull cam, but where are my adjuster screws, looked high and frickin' low, and can't see them... Any thoughts? It's a Q-Jet 4 Barrel tag number C-9625... Hopefully somebody can help, my local mechanic isn't answering his phone... -_-
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1981 Sierra Classic 1500, 305 4BBL, Ltd. Slip Rear End |
08-11-2014, 12:00 AM | #2 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Look at the front of the carb, on the base plate below where you see the vacuum fittings.
Often, they had plugs installed over the adjuster screws. A tiny drill bit and an easy out will remove the plugs.
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"Off the grid and on the seven day weekend plan" "One person cannot know everything, but between all of us, there isn't much we don't know." |
08-11-2014, 12:10 AM | #3 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
I appreciate the quick reply MG, Seeing as it's too dark to see much, I'll check in the AM tomorrow, but I do appreciate any input... THis carburetor apparently has a bunch of leaks, so she'll need replacing anyways, but I need to get a bit better mileage out of 'er :P
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1981 Sierra Classic 1500, 305 4BBL, Ltd. Slip Rear End |
08-11-2014, 12:20 AM | #4 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Before you spend a herd of money on a new carburetor, it might be worth rebuilding.
There are two well plugs at the base of the primaries that usually start to leak. Clean up real good and seal them with a tad of JB weld and let it set up completely before reassembling. Usually takes a little filing to get the two halves of the carb to go together if the JB weld glob is too thick. And check the base plate where the throttle shaft runs through it, if there's a ton of wobble it will need to have bushings installed.
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08-11-2014, 12:24 AM | #5 | |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Quote:
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1981 Sierra Classic 1500, 305 4BBL, Ltd. Slip Rear End |
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08-11-2014, 12:31 AM | #6 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
If you end up getting an Edelbrock, get a fuel pressure regulator and put it in the line going to the carb, set it at 4.5 to 5 psi or you run the risk of flooding it and wasting gas.
Edelbrocks are good but are sensitive to too much fuel pressure and it's easy to over-ride the needle/seat and float.
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"Off the grid and on the seven day weekend plan" "One person cannot know everything, but between all of us, there isn't much we don't know." |
08-11-2014, 12:17 AM | #7 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Mixture screws won't change a bunch of leaks!
It's flooding! Carb kit time. Here's a rebuild link with a pic of those mixture plugs. http://www.vetteprojects.com/kstyer/quadrajet_3.htm |
08-11-2014, 12:20 AM | #8 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Unless you're talking Vacuum leaks, which is what's happening, not fuel leaks... But yeah... I just realllllllly don't want to have to spend 350+ on a new carb, when that 350+ could be going to bodywork & other stuff...
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1981 Sierra Classic 1500, 305 4BBL, Ltd. Slip Rear End |
08-11-2014, 12:34 AM | #9 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Buy a carb kit and come down Island!
I'll help you rebuild it!! |
08-11-2014, 12:40 AM | #10 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
G, that would be sweet! It won't be for a bit, yet, mostly because I landed a job, and I only go down once every 2 to 3 weeks, but that would be sweeeeeeet!
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1981 Sierra Classic 1500, 305 4BBL, Ltd. Slip Rear End |
08-11-2014, 08:46 AM | #11 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Something to check before rebuilding the carb is make sure the exhaust system is flowing freely. On my 75, one side of the OEM Y-pipe collapsed, forcing most of the exhaust through the intake crossover. This did bad things to the carb causing it to flood like yours is doing. Even if you now have dual exhaust, it might be possible that it happened in the past. No point in fixing the carb if the original causing problem still exists.
Make sure your rebuild kit includes a float. Some of those were a sort of weird foam stuff that could get fuel logged and quit floating. |
08-16-2014, 07:11 PM | #12 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Not again....
First of all, step back from the "must have an Edelbrock parts store carb" idea for now. Just like in all these threads I've been reading, A. you have to use an adapter, B. if it has a hot air or divorced choke, you lose the use of that until you wire up an electric choke and C. you go from having a carb that can flow up to 750cfm of air to one that will flow 625cfm or so, depending on which version the parts store has on the shelf. I have rebuilt many Quadrajets and they are not hard to rebuild and they run EXCELLENT afterward. I just rebuilt one for my '79 350 and it works like new, choke and all. However, like any carburetor, you have to install it correctly, run the vacuum lines correctly and have an engine that is not about to expire anyway. The number you gave is not a valid number for a Quadrajet. The number you are looking for is on the driver side of the carb, on a rib running vertically, behind the linkage. Looks something like 17057223..for example. The IDLE mixture screws are at the bottom front as mentioned. I have many Qjet videos on my youtube, check them out if you wish to rebuild it and get it working good again. Otherwise, go to the parts store, get your carb and your adapter and have at it www.youtube.com/whosaidtyler |
08-16-2014, 07:14 PM | #13 |
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Re: Where are my mixture adjusters!?! Q-Jet 4 Barrel Tag no. C-9625
Also, being an '81 the idle mixture screws "might" be sealed under plugs but I don't think Canadian carbs had to do that. I also be that is a rebuilder carb and you got that number off the tag that is retained under a screw at the top. Just a guess.
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