Question about 1985 Ford F 250

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Changed 4 barrell carb to a 2 barrell it wont hold the idle and dies out

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  • Anonymous Mar 17, 2014

    Can you change a 4barrel carb to a 2 barrel

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That 2 barrell needs some more work done to it and what was wrong with the 4 barrell the 2 main jets in a 4 barrell are smaller than a 2 barrell as long as you dont engage the 4 barrells your using less gas anyways.

Posted on Nov 19, 2009

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84 Nissan pickup: will not smooth idle when choke goes off. It's the z24 motor 2 barrel carb. I've tried adjusting by turning the idle screw with no success. I've also sprayed carb with carb cleaner.


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JUST REPLACED CARB ON MY 1992 CHEVY SILVERADO WITH A 4.3 LITER. NOW IT STARTS AND RUNS FINE UNTIL IT WARMS UP THEN DIES AND WONT START FOR 30 MIN


How many rpm's is it running at when you first start it up and it is running on the choke? Does it gradually start to idle back and then start to die r does it do it all of a sudden and dies?

When running with the choke on, it is on the high idle circuit of the carb, as it warms up the idle should slow down and then idle in the 800 rpm range in Park, 650 in Drive. This will be the low idle circuit range. This transition inside the carb will cover an idle air bleed hole in the venturi of the carb and lean out the mixture. If you notice that the carb smells gassy and black rich unburnt gases are coming from the tailpipe, the problem is located within the carb and requires a carb tech to do a rebuild of the carb. You could try a good carb cleaner like Lucas by putting it into the gas tank, in case you just got a bad tank of gas, but that is just a bandaid for a more deeply rooted problem. Get the carb rebuilt?

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Car dies when it warms up. just replaced carb, think it has to do with this


Vapor lock again! Make sure the fuel lines are away from hot surfaces, or insulated.
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How do you set the idle


There are all kinds of adjustments on that vehicle. Also, it depends on which carburetor it is equipped with. That vehicle came with a Rochester 2-barrel carb, a Rochester Quadrajet carb, or a Holley 4- barrel carb. There is not enough time or space to post all of the information about this here. I would recommend going to alldatadiy.com and subscribing to the service information for your vehicle for a small annual fee, or purchacing a manual like Chilton or Haynes.

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I have a 1981 ramcharger 318 4 barrel edelbrock carb. it starts fine, drives well for about 15 min but dies. dies quicker when 4 barrels kick in. about 2 min after dying it will start up fine and do it...


Those rattly noises are detonations,  caused by a very lean mixture. All the other symptoms indicate that the fuel flow to the carb is too low. Since you have replaced the pump and the filter, the only other things left to check are the lines and the tank sump. Or you could install a much larger pump.

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I need to adjust a carberater and get the 4 barrel to start working


Most likely you have a Holley carb. You may have a 460 engine. If you have the carb with a big vacuum pot in front of the carb, then you have a RPM governor. The RPM governor will work against the 4 barrel.

The main mixture for the idle jets can be adjusted like any old style carb. You may have plastic caps over the idle screws but take them off. Then use a vacuum gauge on any intake fitting and proceed to read the vacuum level as you turn the mixture screws. You want the mixture to reach a maximum RPM, then evenly turn the screw in until the RPM drops slighty and then balance for smoothest idle.

After this step adjust curb idle and see if this helps when the 4 barrel kicks in. Holley has different springs for the vacuum actuated secondaries and they are color coded. If the carb is original it should be right, but if the carb is of unknown origin you can check the proper vacuum spring, main jet, power valve and so on in a good Holley book. The mechanical secondaries are also listed with clearances to hand adjust.

By adjusting the mixture screws you have set the engine to idle just below peak vacuum pressure. This means you should have more vacuum to work the secondaries.

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