CJ7 Carter BBD Vacuum Line Help - Page 6 - JeepForum.com
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post #76 of 201 Old 07-04-2013, 02:39 PM Thread Starter
KnoxButler
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Quick question... Iv got my VA hooked up to manifold vacuum, meaning timing is the most advanced at idle right? So how does it work while using a ported vacuum, it would advance the timing while at higher rpms and or load? Iv seen a lot of debate around weather to use ported or manifold and I guess my question is, it seems to me like the VA would preform very different between manifold and ported so how is there not one definitive right way? Hope that makes sense, if not ill try and clarify.

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post #77 of 201 Old 07-04-2013, 02:42 PM
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Try BOTH ways before you take it in.
Seat of the pants, may tell what's best.
LG
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post #78 of 201 Old 07-04-2013, 02:48 PM Thread Starter
KnoxButler
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Ok ill have to do that, so does the advance give you more power when its advance ie manifold = low end power, port= high end power?
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post #79 of 201 Old 07-04-2013, 02:57 PM
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post #80 of 201 Old 07-04-2013, 03:05 PM
86cj74.2L
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One thing to make sure of is that if you have a carter BBD with the stepper control that the needles are always moving. If they are all the way in or all the way back you need to readjust your mixture screws. If it sits centered and never moves after engine gets above 130 degrees you need to find out which switch is bad.

Of coarse if you have a pre 1983 (or I think 1981 if California) no worries about the computer working cause there isn't one.
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post #81 of 201 Old 07-04-2013, 03:08 PM Thread Starter
KnoxButler
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Great link!
Skimmed through it and found the spot about the difference between the two. Very interesting, I guess that makes sense. Ill have to try both but unless I feel a big difference ill probably stick with manifold vacuum.
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post #82 of 201 Old 07-04-2013, 04:00 PM
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post #83 of 201 Old 07-04-2013, 04:33 PM Thread Starter
KnoxButler
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Describe a "ping" its a lot quieter than it was before. The engine was fluttery but I had stuck that on it being so lean and idling so low. Now with proper timing its at the same settings before still running like a champ.
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post #84 of 201 Old 07-04-2013, 04:48 PM
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Quote:
Originally Posted by KnoxButler View Post
Describe a "ping" its a lot quieter than it was before. The engine was fluttery but I had stuck that on it being so lean and idling so low. Now with proper timing its at the same settings before still running like a champ.

You can kind of hear it here:
https://www.youtube.com/watch?v=JA0cH_vRABg

sounds at first like keys jingling.
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post #85 of 201 Old 07-04-2013, 04:52 PM Thread Starter
KnoxButler
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If i had heard it would i know? Im not really hearing anything familiar with the video. My jeep has no doors or top and the exhaust isnt the quietest, is it possible that I just didn't hear it, or is it a fairly obvious noise. None the less it seems to be running very quiet, well more so than before.
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post #86 of 201 Old 07-04-2013, 04:58 PM Thread Starter
KnoxButler
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Also when it was idling i never heard any pinging noises... Dont know if it would do that with that bad of timing.
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post #87 of 201 Old 07-04-2013, 05:04 PM
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Does your carb have a bundle of wires going to it?

If you do, you need to go to my YouTube channel "EugeneKingify" and watch the two videos of stepper pins at idle. If your carb is like that one and not and the pins are not moving its most likely your high HydroCarbon.
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post #88 of 201 Old 07-04-2013, 05:08 PM
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Quote:
Originally Posted by KnoxButler
If i had heard it would i know? Im not really hearing anything familiar with the video. My jeep has no doors or top and the exhaust isnt the quietest, is it possible that I just didn't hear it, or is it a fairly obvious noise. None the less it seems to be running very quiet, well more so than before.
Low RPM and under load, it will sound like a Diesel engine. Not as loud as a diesel but that same sort of noise. You wouldn't notice it as much at idle unless it was really bad. You would notice it in high gear going up a long steep hill with the pedal to the floor. Rob
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post #89 of 201 Old 07-04-2013, 05:09 PM Thread Starter
KnoxButler
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86cj it has no stepper motor.

Robs, do you mean that whooshing noise?
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post #90 of 201 Old 07-04-2013, 05:44 PM
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No, the clacking sound. You will know it when you hear it. The more advanced the timing the louder it will be. Sounds like metal pinging against metal. Actually, that's exactly what it is. Rob
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carter carb , cj7 , egr , emissions , vacuum

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