Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

carb question

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Old Jun 20, 2006 | 08:22 PM
  #1  
berlincam86's Avatar
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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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Old Jun 21, 2006 | 11:34 PM
  #2  
Sonix's Avatar
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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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Old Jun 22, 2006 | 05:53 AM
  #3  
berlincam86's Avatar
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From: Ontario ,NY
Car: 1992 Z28
Engine: 350 tpi
Transmission: 4L60
Axle/Gears: 3.23
No, I mean looking in the bores while it's idleing only one side is delivering fuel.
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Old Jun 22, 2006 | 08:36 AM
  #4  
five7kid's Avatar
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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
You shouldn't be able to see fuel when idling.
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Old Jun 22, 2006 | 12:55 PM
  #5  
99Hawk120's Avatar
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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.

Last edited by 99Hawk120; Jun 22, 2006 at 01:00 PM.
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Old Jun 22, 2006 | 08:29 PM
  #6  
berlincam86's Avatar
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From: Ontario ,NY
Car: 1992 Z28
Engine: 350 tpi
Transmission: 4L60
Axle/Gears: 3.23
The engine is bone stock. I'll give them links a look at though thanks.
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Old Jun 23, 2006 | 12:38 AM
  #7  
five7kid's Avatar
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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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Old Jun 23, 2006 | 06:09 AM
  #8  
berlincam86's Avatar
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From: Ontario ,NY
Car: 1992 Z28
Engine: 350 tpi
Transmission: 4L60
Axle/Gears: 3.23
Nope they are in there nice and tight.
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Old Jun 26, 2006 | 03:06 PM
  #9  
five7kid's Avatar
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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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Old Jun 26, 2006 | 05:09 PM
  #10  
berlincam86's Avatar
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From: Ontario ,NY
Car: 1992 Z28
Engine: 350 tpi
Transmission: 4L60
Axle/Gears: 3.23
I'm thinking it was the seals in my idle air bleed valve because I changed them now it doesn't drip.
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