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Old 09-16-2010, 03:34 PM   #1
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mixture screws motorcraft

Is it normal for my jeep to run at which seems the best with the mixture screws out 3 full turns

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Old 09-16-2010, 07:23 PM   #2
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To adjust the carb for idle mixture make sure you time the engine first. Then hook up a vacuum guage to manifold vacuum. Now screw in one idle mixture needle and count the turns until it lightly bottoms. now back the screw back the same number of turns. usually around 3-1/2 turns. now screw in the other side and back it out the same number of turns as your first screw. it is very important that these screws be set the same number of turns as close as 1/8 of a turn. now start the engine and set the idle about 800 rpm or so. you must stay under 900 rpm or other circuts in the carb start pulling fuel and screw up what your trying to do. now look at your vacuum guage. what you are looking for is the highest steady vacuum needle reading. turn one idle screw in 1/4 turn and watch the guage if the vacuum reading goes up you turned the screw in the right direction. if it goes down in vacuum or the needle gets more unsteady then you went the wrong direction. next move to the other mixture screw and turn it the same way as the last. always keeping the turn count on the idle mixture screws the same. When you reach the highest steady reading at 1/4 turns now move to 1/8 turns then 1/16 th of a turn. always searching for the highest steady reading. You will have to keep adjusting the curb idle screw or your idle solonoid to keep the basic idle speed under the 800 rpm range. when you get the best readings then lower your curb idle speed down where it belongs in the 700 rpm range and check your idle mixture screws again. after you get the idle speed right and the highest steady vacuum reading on your vacuum guage then turn your idle mixture screws in 1/16 of a turn and your done.

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Old 09-16-2010, 08:36 PM   #3
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Fweaky thanks alot i was wondering how the Vacuum setting went
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