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post #1 of (permalink) Old 06-14-2000, 11:57 AM Thread Starter
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Carter BBD idle tubes

With all the talk about keeping the Carter idle tubes clean, I pulled 'em the other day as the engine in my 79 CJ5 was idling crappy. They looked clean, but I blew 'em out anyway, and put it back together. While I was at it I checked the timing; it was off only 1°, so I fixed that, too, and richened the idle screws ever so slightly. Now it idles very smoothly, but I'm not sure just what fixed it!

My question is: For those of you who have fixed idle problems by cleaning the tubes, did they have visible crud in them? Or would 1° of ignition timing make a difference?


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post #2 of (permalink) Old 06-14-2000, 01:05 PM
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Re: Carter BBD idle tubes


I have done the idle tube thing. I never saw any crud come out, but we may be the exception and not the rule. As far as the 1° of timing change it should not make alot of difference in performance. I'll vote for the "crud in the tubes" reasoning.

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post #3 of (permalink) Old 06-14-2000, 06:58 PM
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Re: Carter BBD idle tubes

I don't think that you will notice only 1 degree of timing change.

The stuff that I usually find in the emulsion tubes is a hard white deposit, similar to salt deposits in water. When you clean the tubes, you should also drill the bottom of them out to .004 inches. This not only prevents the deposits from happening again, but also richens up the off idle and progression ports a little. Jet drills are cheap, you can also use a cleaning tip set for a torch.

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post #4 of (permalink) Old 06-15-2000, 01:56 AM
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Re: Carter BBD idle tubes

Ok, I've been wanting to drill out the two tubes but I cannot find a drill bit smaller than 1/16". Lately I've been thinking of just taking the venturi to a machine shop and see if they could do it. I would rather do it myself. What is a "jet drill" and where could I find one? Thanks.

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