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.

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Old Mar 13, 2006 | 11:53 PM
  #1  
Tony78_280z's Avatar
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Joined: Dec 2005
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Car: 78 Datsun 280z with GM 350
Engine: Carbed TBI (Truck) 350 W/Ported 193s
Transmission: 700r4
Axle/Gears: Stock 280Z Rear
What the...?

On the side of my qjet. . . What is this screw? What does it to? and what should its stock setting be?

My exploded diagram doesn't even mention this.

http://www.angelfire.com/clone2/tony/QSCREW.HTML

Thanks
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Old Mar 14, 2006 | 12:20 AM
  #2  
DENN_SHAH's Avatar
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From: houston
Car: 83 POS monte carlo 2015 chevy P/U
Engine: 92 5.7 tpi 5.3
Transmission: 700r4 6L60E
Axle/Gears: 2.42 too high
thats the cold start fast idle screw, you set it by RPM with the choke set.
normally you don't need to touch it unless you are having problems with a too high or too low cold start idle speed.
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