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Carter carb mixture setting - 1983 Chevrolet Camaro

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Run setting screws allll the way in then turn 11/2 turn out - set idle screw .

Posted on Nov 11, 2010

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How to adjust the fuel and air mixture on a 1982 ford 4.9 six cylinder, carter carburetor.


There should only be 1 screw located at the base of the carb facing outward.

The method I use requires a tachometer. If you don't have a tachometer then you can use the "by ear" method, though it's not as accurate.

With the engine off, start by turning the screw all the way in, then back it out 1 and 1/2 turns. This usually give you a baseline to start with.

Start the engine and get it up to operating temperature, make sure the choke is fully open, and have the air cleaner and all vacuum lines installed.

Using the tachometer (or ear) turn the screw (usually out) until the RPMs increase. If they don't increase by turning the screw out, then try turning it in.

Eventually the RPMs will stop climbing while turning the screw (as said earlier, usually out).

THEN turn the screw the opposite direction (usually in) until the RPMs JUST start to drop off. That should be real close to the optimum setting.

This setting is ONLY for the base idle air/fuel mixture and is NOT for anything else.

Hope this helps.

Feb 16, 2015 | 1982 Ford F 150

1 Answer

I would like to know if you have a carter carburator diagram for a 2bbl carb


Www.carter.com ask for exploded views of your carb you'll need the tag number on the carb. Its relatively easy to do as long as your float level is correct or google carter carberators using the tag number

Feb 06, 2015 | Cars & Trucks

1 Answer

Carburetor diagrams deni pd24jh


Did you adjust the idle mixture screws ? Is this a two or four barrel carburetor and what make carb. Carter , Holley, Quadrajet etc.. What make vehicle is it ? Normally the idle mixture screws should be opened 1 and a half turns to two turns . counterclockwise from fully seated . Then you can set the idle screw to what the idle should be 600 rpm to 750 in drive . Most cars have a decal somewhere under the hood telling all these things !

Aug 14, 2014 | Cars & Trucks

1 Answer

Have a 73-74 366 that has a aftermarket carter afb carb and it is popping through the carb while cranking and will not stay running. Have done a compression test-normal, changed cap and coil, checked...


Usually there are three reasons for backfiring thru the carb.
Not enough fuel, spark timing too early, or an open intake valve.
If the compression is good on all cylinders as you stated, my guess would be spark timing or mixture too lean. Could be a large vac leak somewhere too.
You say you checked the ignition, but do you know for a fact the plugs are all firing at the right time ? You could pull each plug wire and check each cylinder one at a time. Did you change the rotor when you changed the cap, and is there any chance the wires are cross-firing ?

Sep 05, 2013 | Chevrolet Cars & Trucks

1 Answer

I have a 1980 ford f-150 4.9 300 straight 6 what are the stock timing specs and what is the stock air/fuel mixture for the 1 barrel carter cab


The timing is 10 BTDC with the spout shorting par removed. The car is set to lean best idle and then 1/8 turn in to lean it a bit more for emissions compliance.

Oct 16, 2012 | Ford F-150 Cars & Trucks

1 Answer

I HAVE AN 82 F-100 FORD PICK-UP WITH A STRIGHT 6 1B CARB. I PUT A NEW CARB BUT ITS SPILLING GAS AND THROWING BLACK SMOKE WHEN I START IT HOW CAN I ADJUST THE FLOT AND MIXTURES CAN YOU HELP ME THANK YOU...


You probably have a Carter carb. The metal tag on the top, held on by one of the screws should say YF/YFA. If so, you need to remove all the screws on the top and you will see the float. It should be .78 inches from the bottom(about 3/4 inch). I doubt being new that the float needs adjusted though. If it sat on the shelf long the float might be sticking. You will need to tap lightly (maybe using a wrench, or small hammer).
The idle mixture screw is in the front bottom of the carb but it has a limiter cap on it. It shouldn't really need adjusted either

May 11, 2010 | 1982 Ford F 150

1 Answer

Firing order for a big block 440 from a Sports Coach rv Also I need the Parts breakdown for the carb. Thanks


The firing order for that motor is 1-8-4-3-6-5-7-2 The carb is I imagine a carter afb or similar four barrel here is a great link to carter carbs copy this entire link into your address bar
http://www.rodandcustommagazine.com/techarticles/135_0402_four_barrel_carburetors_howto/index.html
I hope this helps you.

Aug 14, 2009 | Chrysler Executive Cars & Trucks

1 Answer

1967 barracuda carb backfires do I adjust screws in or out?


I would check the float level first if you are going to adjust the carb., carters like to flood and if you check your spark plugs you can tell if your running rich. The other adjustment you will make with a simple vacuum gauge.You should probally check distributor points,and timing as well. More info would help, like is it back firing up the carb or out the exhaust or when accelerrating or decelerating.

May 22, 2009 | 2006 Plymouth Scamp

1 Answer

Jeep cj won't idle


Assuming that the jeep has not been modified it is likely the Carter BBD Carburetor on that engine, or the sensor inputs to the carburetor.

The Carter BBD has an idling circuit that is always seeking. There is a stepper motor that keeps changing the rpm, and fuel mixture. It basically never stabilizes, and it keeps adjusting based on the feedback loop from half a dozen or so sensors.

So, if a sensor goes bad and feeds a constant signal to the carb, you get problems.

The Carter BBD is a very difficult carb to rebuild and is usually fairly dear in terms of cost.

If you can find a Jeep factory repair manual (on ebay) on the 85 cj -- it is an olive green manual about 3 inches thick and is usually not too expensive, it has troubleshooting procedures for the BBD. Don't get a Haines or aftermarket manual. get the olive drab official factory manual

Remember it is probably the carb that is bad, but there may be more to it than just that.. I don't remember all the inputs to the stepper motor circuit, but I do know that EGR valve is one of them.

good luck

May 16, 2009 | 1996 Jeep Grand Cherokee

1 Answer

I don't know where the air/fuel mixture screw is on my carb


There should be one screw (I'm assuming it's the Carter YF carburetor 1 barrel) that's by itself away from linkages etc, more to center at base of carb where it meets manifold, that is angled approx 45 degrees going in to base. That should be your mixture screw. What symptoms are you experiencing anyway?

Apr 03, 2009 | 1984 Ford F 150

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