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post #1 of (permalink) Old 09-06-2001, 10:03 PM Thread Starter
 
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Carter BBD

I just had a quick question.

I'm going to go get my MotorCraft 2100 this weekend, but before i do I figured I should ask "What is an idle mixture screw?"

I've been adjusting the crap out of the 2 screws that are spring mounted and attached to the throtle linkage.

are those the idle screws? or are the two screws deep down in the carb above the venturi cluster the two idle mixture screws. (When I took it appart I just put those back in there snug.)
They are two screws with holes in them.

Anyone?


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post #2 of (permalink) Old 09-06-2001, 10:15 PM
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Re: Carter BBD

The two screws you are looking for are halfway down the carb, towards the front of your jeep.(opposite side of your stepper motor if you have one).
Try to adjust them a little at a time in equal increments, if you can.
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post #3 of (permalink) Old 09-06-2001, 10:17 PM Thread Starter
 
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Re: Carter BBD

Are they inside the carb? or outside.

Because the only screws outside the carb are big ones that hold it to the manafold, and the two idle (rpm) adjusting ones.


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post #4 of (permalink) Old 09-06-2001, 11:10 PM
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Re: Carter BBD

the idle mixture screws do have springs on them. they are close to the base of the carb, on the side facing the front of your jeep. keep looking, you'll see em. adjust them equally with 1/4 turns, starting from about 2 turns out (rich) and then keep leaning it out. If you do a search you can find specific Carter BBD tuning instructions.


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post #5 of (permalink) Old 09-06-2001, 11:40 PM
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Re: Carter BBD

Those idle mixture screws may be "capped" to keep you from tampering with them for emission purposes. You might have to take the carb off (unless you find another way) to drill the caps off.
As previously mentioned, move these screws alittle at a time. Too far in and the engine will start to die. As you move them out you should notice that the idle speed (rpms) increases. I like to turn the screws in until the engine starts running rough and then I back them out about 1/2 to 3/4 of a turn.

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post #6 of (permalink) Old 09-07-2001, 12:09 AM Thread Starter
 
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Re: Carter BBD

I'm going to need a picture.

Anyone with a digital camera care to aid me?
It's a rebuilt carter, but there's no sign of any screws capped or not. (We don't have emmissions here.)


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post #7 of (permalink) Old 09-07-2001, 01:28 AM
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Re: Carter BBD

They are just below and on either side of your fuel line input on the front of the carb. You may have to move some wires out of the way to see them because the carter is so cluttered. Get to the front of the Jeep and bend down so your eyes are just above the radiator and you should see them. These are the idle mixture screws. If you have done the Nutter, you are likely running rich and adjusting these, (only a bit) may help that at idle only.
The only thing that will change with the screws you are adjusting now is 1. it will rev too high or low and 2. the choke is set too high or low.

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post #8 of (permalink) Old 09-07-2001, 01:49 AM Thread Starter
 
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Re: Carter BBD

I figured, when it doesn't stall and die, it revs at 1700.
Otherwise it just slowly winds down and dies. Sometimes it just dies, and others it tries to hold on.
I disconnected my electric choke. Figured I should get it to idle first then mess with the choke.



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post #9 of (permalink) Old 09-07-2001, 07:00 AM
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Re: Carter BBD

the carter blues!


http://www.off-road.com/jeep/tech/258bbd/solvac.htm


http://www.off-road.com/jeep/tech/258bbd/Major.htm


http://www.off-road.com/jeep/tech/engine/carter.html


the best thing to do if idle probs like NOT wanting to idle is to clean out the idle pick-up tubes. only takes 1 hour to do and has been my prob before. follow instructions on site above.


post #10 of (permalink) Old 09-07-2001, 10:33 AM
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Re: Carter BBD

Let me know what you think of the 2100 carb when you get it installed. I am thinking of useing one myself. My other option is to use an Edelbrock preformer 500 cfm with a new manifold. The 2100 would be cheaper, but I don't know if the performance would be as good.

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