carb question
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Joined: Dec 2005
Posts: 201
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From: Ontario ,NY
Car: 1992 Z28
Engine: 350 tpi
Transmission: 4L60
Axle/Gears: 3.23
carb question
Isn't my carb suppose to discharge fuel out of both throttle bores? If so how do I fix this because I only get one bore with fuel.
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Joined: Jul 2004
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
yes. you mean if you are looking down the primary venturies, and you flick the throttle, you only get a pump shot on one side? Rebuild, and find out what's blocking it. I'm guessing you just can't see it from where you're standing.
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Joined: Jan 2001
Posts: 1,411
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From: Rock Hill, SC
Car: 1999 Pontiac T/A Firehawk
Engine: ***'s Engine
Transmission: T56
If you can see fuel while idling, you have nozzle drip. It's not unusual for it to drip out of only one side; when the setting was close, the carb on my Buick would do that.
To fix nozzle drip, you need to close the throttle more. I'd be surprised if you had much control over your idle mixture with the screws in the throttle body as is. If you CANNOT close the throttle far enough to get the drip to stop without the idle RPM dropping too far and/or stalling, you will need to increase the size of the Idle Air Bypass holes on the carb (if equipped) or drill holes in the throttle blades.
I'm not sure how modified your engine is; if it's pretty stock, I'm not sure what could be causing the problem. Anyhow, if you're interested, theres a long thread discussing nozzle drip, low idles, and other QJet tuning woes. This post deals specifically with adjusting the Idle Air Bypass in order to get a large, fairly well cammed engine to idle correctly on the QJet idle system.
To fix nozzle drip, you need to close the throttle more. I'd be surprised if you had much control over your idle mixture with the screws in the throttle body as is. If you CANNOT close the throttle far enough to get the drip to stop without the idle RPM dropping too far and/or stalling, you will need to increase the size of the Idle Air Bypass holes on the carb (if equipped) or drill holes in the throttle blades.
I'm not sure how modified your engine is; if it's pretty stock, I'm not sure what could be causing the problem. Anyhow, if you're interested, theres a long thread discussing nozzle drip, low idles, and other QJet tuning woes. This post deals specifically with adjusting the Idle Air Bypass in order to get a large, fairly well cammed engine to idle correctly on the QJet idle system.
Last edited by 99Hawk120; Jun 22, 2006 at 01:00 PM.
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I wouldn't be surprised if when pulling the airhorn off the carb that you'd find an emulsion tube laying in the well instead of stuck in the airhorn where it belongs.
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Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Something is causing an imbalance that is making only one booster dribble.
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