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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 09-13-2009, 02:17 AM   #1
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Rich As Hell

i went and rebuild my 1406 edelbrock carb last night and put it back onto my camaro but now the camaro is running rich as hell and im not sure how to adjust the mixture screws in the front or even if this would fix the problem. Can anybody give me some advice???
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Old 09-13-2009, 11:27 AM   #2
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Car: 1991 Z28 vert, 1988 GTA
Engine: 305 TPI, 305 Carb-finally runs!
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Re: Rich As Hell

That would be a good place to start. With the motor off, turn the screws all the way in, don't overtighten them. Back them out 2 full turns, that's a good starting point. Get a vacuum gauge, hook it up to manifold vaccum, and start the engine. I usually start with the driver's side screw. Turn it in it little increments and watch the gauge, once you reach the point where you have the most vaccum available before it gets worse if you turn it any more, stop, and give the other screw the same amount of turns.

You'll also have to adjust the idle air screw on the throttle lever, it's a little flathead screw facing the front of the car with the throttle closed. Use the tach to get it at what you want for idle speed, I usually put it at about 800-900 RPMs.

Also when you get it back together, make sure you have the vaccum advance line connected to the right port on the front of the carb. I had to put mine on the passenger side port.

I had the same problem at idle you are describing, turns out my vaccum advance was all over the place when running because I had it hooked up to full vaccum instead of the timed port.
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1988 TransAm GTA/305 Summit K1103 cam, Edelbrock EPS, Performer carb, T-5, Hedman headers
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Old 10-02-2009, 12:38 AM   #3
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Re: Rich As Hell

Should it run with them turned all the way in? Mine doesn't. Is there any other way to adjust them without a vacuum gauge cause I don't have one of those and I'm going on a 150 mile trip tomorrow and I'd like this baby to be pretty good to go
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Old 10-02-2009, 12:38 AM
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