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FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitTHE NEW! VANCO DUAL MODE 15/16″ Big Brake Kit w/BlaFS: Wranger BRIGHT License Plate LED! Just $3! Great value

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Unread 07-02-2013, 09:55 AM   #571
John Strenk
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OK, Start there then.

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Unread 07-02-2013, 01:42 PM   #572
86cj74.2L
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Unread 07-02-2013, 04:28 PM   #573
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Welp, after a chat with Shawn, we realized I had reverted back to my terminology confusion. Was AGAIN using the wrong GD screw to set the primaries. Set them using the correct screw with high hopes.

Fired it up and it idled cold at 1120, and climbed to 1560 over 15 minutes.
Kicked it down and it landed on 1100.
Monkey w the idle speed screw and could get it down to 820.... only to have it start climbing....
Even with the idle speed screw not touching the cam....(wtf?)

So I tried Johns method above.
With the same results.
Even tried the mixture screws at 1 full turn out as opposed to 1.5..... And still could not get it to 800. And it started climbing with this method, too...

Now, when I tried Johns method the engine was already warm, so idk if that had any bearing.

Also, that random 'slapping' only seems to occur below about 900 rpm...
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Unread 07-02-2013, 06:29 PM   #574
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Insert favorite slew of expletives "here"!

The first thing that came to my mind was "have you re-torqued the manifold bolts with the engine hot?"


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Unread 07-03-2013, 03:13 AM   #575
86cj74.2L
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Could back screw closing the secondary's farther.

When it starts climbing in idle rpm all by its self start spraying things again.

820 in neutral is not bad........you need to start driving soon. Or your plugs are going to get crapped up.
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Unread 07-03-2013, 04:22 AM   #576
John Strenk
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You could always put your finger on the Secondary arm to make sure it's staying shut.
If the primaries are closed all the ways with the engine idle increasing, then it has to be a leak or the secondaries.

Do you have full control over the mixture screws? Meaning if you close them, the engine stumbles and/or dies, opening them causes it to stumble and/or die?

Does that holley have a power valve? IF it is ruptured, what are the symptoms?

https://www.holley.com/data/TechServ...wer_valves.pdf
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Unread 07-03-2013, 04:56 AM   #577
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Quote:
Originally Posted by swatson454 View Post
The first thing that came to my mind was "have you re-torqued the manifold bolts with the engine hot?"
That I did not.
Didn't even hit them again with it cold.

I was SO sure we had it nailed, I pulled the carb readjusted it and fired it up...
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Unread 07-03-2013, 05:01 AM   #578
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Quote:
Originally Posted by John Strenk View Post
You could always put your finger on the Secondary arm to make sure it's staying shut.
If the primaries are closed all the ways with the engine idle increasing, then it has to be a leak or the secondaries.

Do you have full control over the mixture screws? Meaning if you close them, the engine stumbles and/or dies, opening them causes it to stumble and/or die?

Does that holley have a power valve? IF it is ruptured, what are the symptoms?

https://www.holley.com/data/TechServ...wer_valves.pdf
I will have to try that with the Secondary arm.

I can only assume that his how the mixture screws will would work.
This is the first time I have ever touched them myself.
But I believe I read somewhere that that is how this carb works.

The only thing I can think of right now, is that I wasn't entirely comfortable with how one of the carb studs felt as I tightened it. Like is was about to strip. I may have to replace that one.

The other thing I am thinking is just set the damn idle where it is, or even at 900, and call it close enough. Then get it drivable....??

And yes 86, I do have to get driving it soon.
Or I'll set in on fire....
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Unread 07-03-2013, 05:50 AM   #579
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If your curb idle screw (throttle cable side) is backed all the way out like your holding it in your hand and you look down the carb throat and the primary butterfly's are all the way closed with it idling high..........bla bla bla bla bla. It should not even run. Those secondary's are shut? That secondary plate adjustment screw should be just touching the shaft when their closed. Then turn the screw till the plates "just" move off all the way closed. That will keep them from jamming and "just" would be can't quite see light pass through.
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Unread 07-03-2013, 06:24 AM   #580
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Quote:
Originally Posted by 86cj74.2L View Post
If your curb idle screw (throttle cable side) is backed all the way out like your holding it in your hand and you look down the carb throat and the primary butterfly's are all the way closed with it idling high..........bla bla bla bla bla. It should not even run. Those secondary's are shut? That secondary plate adjustment screw should be just touching the shaft when their closed. Then turn the screw till the plates "just" move off all the way closed. That will keep them from jamming and "just" would be can't quite see light pass through.
The Secondaries are set at 1.5 turns out, just enough to keep them from sticking.

I'm not sure the actual contact point of the Secondary screw is even visible.
It's in kind of a 'blind' hole:

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Unread 07-03-2013, 06:28 AM   #581
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Quote:
Originally Posted by John Strenk View Post
Does that Holley have a power valve? IF it is ruptured, what are the symptoms?

https://www.holley.com/data/TechServ...wer_valves.pdf
The 390 does use a Power Valve, but Holley claims it is impossible to rupture it from engine backfire.

Should be no other reason for it to be ruptured...

Symptoms would be as follows (from another forum):

"a "Blown" power valve would be one with a torn or holed diaphram. This would feed lots of raw fuel right into the manifold under the throttle blades. I doubt the car would even run, it would be horribly blubbery rich."
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Unread 07-03-2013, 08:34 AM   #582
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I was just thinking were else could gas and air come from if everything is shut and no leaks in the manifold.

Now a blown power valve on a properly running engine could kill the engine or make it run rich like that but how would it run if it wasn't set up right.

Any date code on your Holley? Was it built after 1992?
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Unread 07-03-2013, 09:45 AM   #583
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Me too, John.

2X, you mentioned a wet throttle plate at one time. Why don't you get it idling and check the float level. You can also look down the carb when it's idling and see if you see fuel dripping from a booster, just be careful.


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Unread 07-03-2013, 10:03 AM   #584
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Quote:
Originally Posted by John Strenk View Post
Any date code on your Holley? Was it built after 1992?
Should have been.
I ordered it in 2010.

I will look for any marking tonight. Have to get the List umber off of it, anyway.
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Unread 07-03-2013, 10:05 AM   #585
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Quote:
Originally Posted by swatson454 View Post
2X, you mentioned a wet throttle plate at one time. Why don't you get it idling and check the float level.
When you say 'get it idling', do you mean check them with it running?
Or once it is warmed up and off of high idle, shut it down and check them?
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