Carter BBD rebuild - Page 7 - JeepForum.com
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post #91 of 151 Old 03-04-2014, 12:13 PM
86cj74.2L
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Everytime Grammys CJ wouldn't idle down with the stepper pins oscillating around 1/8 shoulder showing.

It was the intake manifold leaking vacuum.

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post #92 of 151 Old 03-04-2014, 12:29 PM Thread Starter
moto450r
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Originally Posted by Mike Romain View Post
Is the choke plate held Firmly open when the engine has warmed up? I have seen a worn or out of adjustment choke spring cause symptoms like that.
Yes, the choke is working well. I wish I could get this video uploaded, it shows it from cold to warm.

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post #93 of 151 Old 03-04-2014, 12:32 PM Thread Starter
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Originally Posted by 86cj74.2L View Post
Everytime Grammys CJ wouldn't idle down with the stepper pins oscillating around 1/8 shoulder showing.

It was the intake manifold leaking vacuum.
I'll check that.

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post #94 of 151 Old 03-04-2014, 01:06 PM
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Originally Posted by moto450r
I'll check that.
If you don't have the felpro two piece gasket set for the manifolds and your looking for something to do just replace it.

Members will argue against this but I never had luck keeping those dam bolts tight until I got the two piece gasket set. Which put both manifold flanges at a even height. And I went junking and got all the cup washers I could find.

The lean best idle is what it says. Tuning for the highest vacuum is generally the richer way to adjust idle mixture.

I used brake cleaner and sprayed the head where the manifold gaskets are. It all but stalled it when I found it.
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post #95 of 151 Old 03-04-2014, 05:34 PM Thread Starter
moto450r
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Originally Posted by 86cj74.2L View Post
If you don't have the felpro two piece gasket set for the manifolds and your looking for something to do just replace it.

Members will argue against this but I never had luck keeping those dam bolts tight until I got the two piece gasket set. Which put both manifold flanges at a even height. And I went junking and got all the cup washers I could find.

The lean best idle is what it says. Tuning for the highest vacuum is generally the richer way to adjust idle mixture.

I used brake cleaner and sprayed the head where the manifold gaskets are. It all but stalled it when I found it.
It may be a timing issue also... see my new thread on what I found on my timing adventure

That's funny that you said it almost stalled using brake cleaner, I was expecting it to idle up when I sprayed it directly into the air cleaner as a test. But it just started running rough. So, I stopped for the day and was going to get some starting fluid tomorrow.

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post #96 of 151 Old 03-04-2014, 06:03 PM
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My brake cleaner was non flammable. From bowman.
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post #97 of 151 Old 03-05-2014, 02:57 AM
86cj74.2L
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How much throttle shaft play do you have?
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post #98 of 151 Old 03-05-2014, 03:55 AM
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Cool.
I'm going to let it ride for a few days as it is, only because I have another observation that may be related in a round-a-bout way......

After I set the idle mixture screws, I decided to watch the main discharge nozzles to see how the FA mixture was coming out of them. I have been wondering what affect (or is it 'effect') the wrong size metering rods, and the jet I resized, was having. What I saw was odd or may be not. At about 1500 rpm the inboard nozzle/venturi had a good bit of fuel coming out of it but the outboard nozzle/venturi had very little, in comparison. At about 2000-2500 they both seem to be flowing at the same rate. I wonder if there is less flow on the outboard nozzle/venturi because its location is further out on the manifold or ??????

Another problem maybe but do both throttle plates open evenly?
Tough to measure it once it's mounted but maybe the throttle shaft is a little bent.
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post #99 of 151 Old 03-05-2014, 09:42 PM Thread Starter
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Originally Posted by 86cj74.2L
How much throttle shaft play do you have?
I didn't measure it while rebuilding it. The play was noticeable but I wasn't setup to measure it.

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post #100 of 151 Old 03-05-2014, 09:47 PM Thread Starter
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Originally Posted by John Strenk
Another problem maybe but do both throttle plates open evenly? Tough to measure it once it's mounted but maybe the throttle shaft is a little bent.
I did give the bottom plate a good visual inspection but I wasn't setup to measure it. It looked ok visually but that ain't worth much.

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post #101 of 151 Old 03-06-2014, 04:56 AM
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Just see how much up and down play it has. Over 1/16 is in the bad zone.
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post #102 of 151 Old 03-06-2014, 05:01 AM
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Do you guys know if seals on the pump have to shaft?
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post #103 of 151 Old 03-06-2014, 05:18 AM
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Do you guys know if seals on the pump have to shaft?
Spell checker issues?

Mike
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post #104 of 151 Old 03-06-2014, 06:55 AM
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Do you guys know if seals on the pump have to shaft?
Quote:
Originally Posted by Mike Romain View Post
Spell checker issues?
Autocorrect?

Hmm, what do the seals on the pump have to do?
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post #105 of 151 Old 03-06-2014, 07:35 AM Thread Starter
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Just see how much up and down play it has. Over 1/16 is in the bad zone.
Ok, will do. I wish I would have been able to measure it, in reality, if I could have left he Jeep down longer I would have installed bushings even if there was no slop.

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