this post was submitted on 02 Jul 2025
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My 77 CJ7 has run for years without any attention, not that I put any great miles on it. This summer it decided it was going to be difficult, so now I have to remember how a carb works, with very small success.

I took it all apart and cleaned it, and blew out the jets. Put it all back together and tried it, no dice. When I come off of throttle, it dies unless I very carefully feather it down to idle. I'm clueless about what's wrong, and have run out of dead chickens to wave over the necromantic device.

I think it would be less trouble to pull the engine and put in a spare 4.0L I have on the shelf.

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[–] [email protected] 1 points 2 days ago (4 children)

Been fiddling with the idle mix adjustment screws a lot. Doesn't seem to make much difference.

Yah, I get that age will do it as well, but really 10 years isn't much for a rebuilt carb unless it was truly subpar materials. But possible I guess.

[–] [email protected] 6 points 2 days ago* (last edited 2 days ago) (3 children)

Been fiddling with the idle mix adjustment screws a lot. Doesn't seem to make much difference.

That's usually a sure sign you still have an obstructed pilot or air jet.

Edit: So you apparently don't have a pilot jet, it's called an "idle pickup tube" in the diagram below. Make good and sure it and the 2 air bleed passages are clean (there is one pickup tube and 2 air passages per "barrel").

[–] [email protected] 3 points 1 day ago (2 children)

That's a very helpful diagram. I was blocking off holes while it hit it with air and trying to figure out what the flow was. I'm going to go over it again with this on hand.

[–] [email protected] 2 points 1 day ago (1 children)

Keep in mind that only shows the idle circuit. But that's probably where your problem is. Also double check float height if you haven't.

[–] [email protected] 2 points 1 day ago

Float height, you mean? Yah, I did that.