352 running rich
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New User
Joined: Jul 2004
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352 running rich
Guys, My question has probably been answered but my searching skills must not be up to snuff. Anyway, I have a problem with my 352 running rich. Here's some background:
Suggestions? Recommendations?
Thanks in advance,
-original '66 352, carb, heat riser, etc
-carb was rebuilt a week ago
-I've checked for vacumn leaks in the usual places...no leaks.
-timing is correct
My situation: After having the carb rebuilt, I installed it and backed off one and a half turns, and tried to dial it in based on the RPM but the engine is running extremly rich. It idles best when the screws are screwed all the way in and even then it's rich. I beat on the carb for a while with the handle of hammer. I pulled the fuel filter and gave it a few shots of cleaner. I don't have a vacum gauge but am willing to buy one if that's the recommend course.-carb was rebuilt a week ago
-I've checked for vacumn leaks in the usual places...no leaks.
-timing is correct
Suggestions? Recommendations?
Thanks in advance,
Postmaster
Joined: Nov 2002
Posts: 3,447
Likes: 1
From: Littleton, CO
First off, welcome aboard!
Secondly... Did you rebuild the carb or have it done by someone else? It sounds like you may need to drop the level on the floats. This will entail opening it up and bending the tang holding them. If you are not comfortable with this, contact who rebuilt the carb. Secondly, how is the idle, is it fast/slow? How have you determined it to "run rich"? A little more info and we'll move forward
--Mike
Secondly... Did you rebuild the carb or have it done by someone else? It sounds like you may need to drop the level on the floats. This will entail opening it up and bending the tang holding them. If you are not comfortable with this, contact who rebuilt the carb. Secondly, how is the idle, is it fast/slow? How have you determined it to "run rich"? A little more info and we'll move forward
--Mike
Thread Starter
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New User
Joined: Jul 2004
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Thanks for the welcome aboard.
I had the carb rebuilt by one of the better shops in town.
As far as the idle, it idles best when I have the adj. screws screwed all the way in. Then it idles with 50 - 100 rpm of where I set.
I determined it to be rich based on the smell, tears, and exhaust. The plugs reflect the same.
I had the carb rebuilt by one of the better shops in town.
As far as the idle, it idles best when I have the adj. screws screwed all the way in. Then it idles with 50 - 100 rpm of where I set.
I determined it to be rich based on the smell, tears, and exhaust. The plugs reflect the same.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Is that the autolite / motorcraft carb? Those things ALWAYS blow out the power valve. One backfire and it's gone. And it does exactly what you're describing. Get a good rebuild kit for it and go to town.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
It could be worse. It could be running poor! Okay bad joke! I agree with the above. It is either the power valve or the floats are set too high. If the jetting wasn't changed then that would be the only thing left. If your fuel pump is stock you need not worry about too much pressure.
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Senior User
Joined: Apr 2004
Posts: 153
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From: dallas, tx
yeah ill 2nd everyone. sounds like the floats. my truck was like that. still is but then again my carb is kinda bad.
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Postmaster
Joined: Nov 2002
Posts: 3,447
Likes: 1
From: Littleton, CO
...and if you are not comfortable with all this, I would contact the rebuild shop, describe what's going on and ask how they will be able to take care of your issues. I would do that before opening anything up too, if you spent some good money on the rebuild, it would be a shame to ruin any chance of "warranty" by cracking into it yourself.
Just a couple more $.01's --Mike
Just a couple more $.01's --Mike
