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Unread 02-21-2013, 11:58 AM   #1
chevelle383
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A dead horse (Weber tuning trouble)

Hi guys,
Long time lurker here. I've gone over and gone over all the Weber install and tuning threads,but I have a little more unique problem than what i could find so here we go...

Specs
1986 :CJ7, Stock 258, with GM HEI dizzy, and just installed USED (mint) Weber 32/36. Redline adapter. Timing has been tried at 9* and 12*, vacuum lines have been tried in several configurations as well as completely plugged. Either gives a stron, steady 16* vacuum reading at the manifold.

Problems:
1) It will start up and idle, but only when the choke is fully engaged. if it even opens a little it starts to die. Full open even when warm is impossible.

2) Mixture screw basically ha NO effect. I can thread it all the way in and all the way out with no change in engine speed. have removed it and observed no damage to the needle.

Not sure what to do. I'm nearly positive I have no vacuum leaks. Have tried several methods to find one. I'm no carb expert, and since the Weber sat unused for an extended period of time, I'm thinking maybe it needs a re build. But gotta say...it seems to work too well other than the problem stated, it revs up fine, etc. Any help here would be great.. Thanks in advance

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Unread 02-21-2013, 12:14 PM   #2
pagnani
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Here is my go to resource.

http://www.justbrits.com/Articles/TuneWeber.html
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Unread 02-21-2013, 12:41 PM   #3
swatson454
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I'd pull that idle jet out, separate it from the holder and make sure you can blow air through it both ways. There's also a number stamped into the jet itself. Can you tell us what size it is?

Is your PCV hooked up and working correctly and have you tried running the distributor on manifold vacuum?


Shawn
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Unread 02-21-2013, 01:04 PM   #4
Matt1981CJ7
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Symptoms point to a massive intake leak, to me.

Matt
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Unread 02-21-2013, 02:18 PM   #5
chevelle383
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I have a master mechanic for an uncle and i sent him an email, he is thinking jets as well Swatson. Lemme do some work and Ill get some more jet info on here.
Matt i was thinking so too, but the vacuum seems to read to good for that, plus I sprayed carb cleaner and starting fluid all over...nothing. you guys have taught me alot about my CJ...you just dont know it. All your advise is a God send on these forums..I hope you all realize that
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Unread 02-21-2013, 02:30 PM   #6
chevelle383
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Anyone have any good links to a exploded view or something? I'm embarrassed to admit Ive never even taken the jets out of a carb haha. And I have built GM engines from scratch. Just something Ive only now needed to know.
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Unread 02-21-2013, 02:40 PM   #7
chevelle383
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If i look straight down the carb, those are the jets right? They are marked 170/160
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Unread 02-21-2013, 02:41 PM   #8
swatson454
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You're quite welcome! There are some sharp and helpful guys running around on here.

You'll be looking for a large, brass screw on the valve cover side of your carb. You can't miss it.



Once you get it out of the carb, separate the jet from the holder...



There'll be a number stamped on the jet. If it's smaller than a 75, you'll likely struggle with the idle whether the carb is gummed up or not. Quick, easy fix, though.

Hope that helps.


Shawn
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Unread 02-21-2013, 02:45 PM   #9
chevelle383
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gottcha...was wonering what those were. OK be right back lol
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Unread 02-21-2013, 02:48 PM   #10
chevelle383
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Ok the idle jet is 60
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Unread 02-21-2013, 02:53 PM   #11
chevelle383
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secondary is 50.....So can i get jets at say NAPA? or should i just order online and call it good? What jet sizes should I start with? my elevation is 2700. I think we're on to something! THANK YOU!!!
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Unread 02-21-2013, 03:03 PM   #12
chevelle383
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found a place that stocks jets....what sizes would you reccomend?
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Unread 02-21-2013, 03:17 PM   #13
swatson454
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I'm not sure where you're looking (hopefully not "solex" carbs direct ) but here's where I've got most of my stuff: Carbs Unlimited. If you'll scroll down the page about half way to the boxes, the top-right box is for the primary (valve cover side) of the carb and you'll need a 75. The next box down (center-right) is for the secondary side and I'm pretty sure it's a 60 you're after.


Shawn
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Unread 02-21-2013, 05:08 PM   #14
chevelle383
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DAmn it!! i just got home with the idle jet...it is too big for the "housing screw." It wont slide into it! where did i go wrong?
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Unread 02-21-2013, 05:09 PM   #15
chevelle383
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In your picture it looks like one of yours is larger than the other? what the heck...mine are same size.
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