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Unread 07-04-2013, 03:04 PM   #601
LumpyGrits
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Are BOTH idle mixture screws turned out the same amount of turns?
If they are not the same amount, that can cause a stumble.
Also, to lean of an idle mix will cause that stumble, along with to little fuel in the carb fuel bowel for the acc. pump to squirt into the carb's throat.
LG

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Unread 07-04-2013, 03:27 PM   #602
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Quote:
Originally Posted by 86cj74.2L
Did you get smaller jets yet? The ones running a 390 Holley that posted their jet sizes were around 48 to 46 for the primary's. then take the jets you pulled out and put them in the secondaries.

So, what changed that you were able to get your low idle. It seems to just have healed itself while you were going to look at things causing the high idle.
Don't want to touch the jets yet...

I honestly think it was the voltage at the choke that was the issue.
Either that or the centrif. adv. was sticking.
Those are the only two things I did...
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Unread 07-04-2013, 03:28 PM   #603
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Quote:
Originally Posted by LumpyGrits
Are BOTH idle mixture screws turned out the same amount of turns?
If they are not the same amount, that can cause a stumble.
Also, to lean of an idle mix will cause that stumble, along with to little fuel in the carb fuel bowel for the acc. pump to squirt into the carb's throat.
LG
Yes, they are both at the same setting - 1 turn out from bottomed
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Unread 07-04-2013, 03:53 PM   #604
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Quote:
Originally Posted by LumpyGrits View Post
Are BOTH idle mixture screws turned out the same amount of turns?
If they are not the same amount, that can cause a stumble.
Also, to lean of an idle mix will cause that stumble, along with to little fuel in the carb fuel bowel for the acc. pump to squirt into the carb's throat.
LG
Quote:
Originally Posted by 2Xtreme View Post
Yes, they are both at the same setting - 1 turn out from bottomed
OK, so far so good.
Now you can adjust those mixture screws Lumpy is talking about to give you the highest idle speed and then adjust the curb idle bring your idle speed back down.
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Unread 07-05-2013, 05:56 AM   #605
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OK, so far so good.
Now you can adjust those mixture screws Lumpy is talking about to give you the highest idle speed and then adjust the curb idle bring your idle speed back down.
This will be Saturdays start.
Once I do this, what is the next step?

Hoping I can drive this thing by next weekend.
Then start addressing the leak that has appeared while doing all of this.....

Made a deposit into the 'emotional bank account' over the Holiday, so I have the entire weekend to do as I wish. Maybe it'll be cool enough to get a little fishing in, too....
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Unread 07-05-2013, 08:38 AM   #606
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drive it
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Unread 07-05-2013, 08:45 AM   #607
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drive it
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Unread 07-05-2013, 09:46 AM   #608
LumpyGrits
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drive it

YUP

Do think those idle mix screws need to come out some.........
LG
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Unread 07-05-2013, 10:09 AM   #609
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OK, little confused here....

Holley's document states:
"Idle mixture needles are found on the metering blocks. Your carburetor will have four idle mixture needles, one for each venturi, this is known as four corner idle. If you change one idle mixture needle, you are required to change the other idle mixture needles the same amount."

I only have 2 on my carb....

I assume, whether 2 or 4, the procedure is the same.... correct?
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Unread 07-05-2013, 12:17 PM   #610
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Yes you only have two.

I prefer the 4 corner idle circuit carbs myself. But those are on the manual secondaries.

You have time to go to sears and buy their 20 dollar vacuum / pressure gauge. Adjust the screws in or out for highest vacuum. If it is now idling too high lower idle and do it again.
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Unread 07-05-2013, 12:58 PM   #611
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Originally Posted by 86cj74.2L View Post
Yes you only have two.

I prefer the 4 corner idle circuit carbs myself. But those are on the manual secondaries.

You have time to go to sears and buy their 20 dollar vacuum / pressure gauge. Adjust the screws in or out for highest vacuum. If it is now idling too high lower idle and do it again.
Lucky for me, I ordered one from Summit waaaaaaaay back when we started this mess....
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Unread 07-05-2013, 01:13 PM   #612
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Quote:
Originally Posted by 2Xtreme

Lucky for me, I ordered one from Summit waaaaaaaay back when we started this mess....
Leave the vacuum advance hooked up while tweeking the fuel screws.

The stock jets on that carb are in the 50's. everyone I saw post their numbers were between 48 and 45. Just remember that while driving it. As fat as its going to be. You may drive it and leave off the gas and the idle will drop to almost stalling............

Just be prepared to not have it smooth as butter until you get the jets dialed in.

If you think the fly weights in the distributor were sticking it may be time to consider buying a reman distributor. Then you can make sure it has the 13r/18r advance head. What's another 55 dollars. And this time don't forget to oil the oil wick under the rotor.

And drive it.
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Unread 07-05-2013, 01:35 PM   #613
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Quote:
Originally Posted by 86cj74.2L View Post
If you think the fly weights in the distributor were sticking it may be time to consider buying a reman distributor. Then you can make sure it has the 13r/18r advance head. What's another 55 dollars. And this time don't forget to oil the oil wick under the rotor.

And drive it.
Distributor is next on the under-hood purchase list.
(Dang I'd like to spend some money on this thing for FUN...)

Anyway, as of now, the vac advance is still off.
I should hook it back up when doing the mixture?
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Unread 07-05-2013, 01:53 PM   #614
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Its time to put on the big boy pants and hook up the vacuum advance to whatever you preference is.

The Chevelle use to have the plugs loaded up when I listened to my brother and drove it on the fly weights. The plugs would burn clean and it would run frisky around the time I was parking it. Hooking up the vacuum advance was a god send. Ran 20 degrees cooler in the summer, much more partial throttle torque, and no more run on when I shut it off.

If you choose manifold of the vacuum source don't be afraid when you see 23 to 25 degrees advance when you hook it up. Just lower the idle to where your happy and drive it.
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Unread 07-05-2013, 02:48 PM   #615
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Is there e benefit to one over the other vacuum source, Ported/ Full?

I've read that manufacturers designed in the Ported source for emissions crap.

All of mine is gone.

Errrr.... most of it anyway, by the PO.
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