DUI on 258, Port vs Manifold Vac Carter BBD. - Page 2 - JeepForum.com
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post #16 of 23 Old 09-24-2021, 11:15 AM Thread Starter
PrincessJ
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PrincessJ.....this is for you
Thats funny.... its kinda like when I was installing my live wires my friend caught a pic of me before an outing

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post #17 of 23 Old 09-24-2021, 11:53 AM
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Originally Posted by Matt1981CJ7 View Post
In my experience, connecting the vacuum advance to manifold vacuum, after setting initial timing, should only increase the idle about 150 RPM on a 258. It's odd that yours increases 300 RPM.

I'd try UpTillNow's recommendation to retard the vacuum advance a little.

Matt
I have found adjusting the advance canister when manifold vacuum is applied to around 15 degrees more advance from the initial 10-12 BTDC is all that is needed for 700 RPM idle speed.
I too have found the RPM increase is roughly only 150 RPM's on a 258.

So, with the initial at 10-12 BTDC, then the advance canister adjusted to 15 degrees increase when manifold vacuum is applied, still increases the idle more than 150 RPM's there may be a vacuum leak as Shawn suggested. (?)
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post #18 of 23 Old 09-25-2021, 11:32 AM
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The OEM BBD on my '83 acted much the same way yours appears to. It had an 800ish idle with the speed screw all the way out, there was a trough in the plastic, stepped, fast-idle cam from the screw and even the metering rods had a flat worn in them from nearly 30 years of service.

You may want to move your attention to that. Is your PCV good to go?


Shawn

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post #19 of 23 Old 09-26-2021, 11:18 AM Thread Starter
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Originally Posted by Shawn Watson View Post
The OEM BBD on my '83 acted much the same way yours appears to. It had an 800ish idle with the speed screw all the way out, there was a trough in the plastic, stepped, fast-idle cam from the screw and even the metering rods had a flat worn in them from nearly 30 years of service.

You may want to move your attention to that. Is your PCV good to go?


Shawn
PCV is functioning as it should, I will dig into it at the end of next week.

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post #20 of 23 Old 10-06-2021, 03:41 PM Thread Starter
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Carb was finger loose. It's now idling at 700 at 180 degrees after a 7/16 wrench to tighten it. Confirmed timing and it tests sat.
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post #21 of 23 Old 10-06-2021, 04:01 PM
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Nice work, Princess!
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post #22 of 23 Old 10-06-2021, 05:33 PM
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I had a feeling you had a sneaky air leak hiding out somewhere. Glad you found it.


Shawn
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post #23 of 23 Old 10-06-2021, 07:08 PM Thread Starter
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The starting fluid test found it quickly
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