Same old carb problems - Page 3 - JeepForum.com
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post #31 of 44 Old 08-03-2011, 10:46 AM
oldtime_ironman
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1991 YJ Wrangler 
 
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Originally Posted by jth0033 View Post
Looks like I have some things to do then. After installing the carburetor I was nervous about doing the nutter since I didn't know if it would pass emissions and I have also never adjusted timing before, little hesitant about doing it seeing that I could really mess something up. Also have never set vacuum using a gauge, kinda learning everything as I go, and whereas its not difficult, I just need to find time since this is my DD.
Timing and vacuum is easy those used to be the main thing before computers and injection. Have no fear, the worst you can do is the motor shut off if you go too far. For sure get a vacuum gauge and timing light at someplace like Sears Craftsman or at Autozone. Learn how to understand them and then do the Nutter like 4.7Stroker said. Be sure to twist the orange and purple wires pretty tight.

Damn I feel old that I can remember stuff.

You'll probably be OK for an inspect in PA (I'm in NY which is hairy) main thing is that it has to look stock even if it isn't.


Last edited by oldtime_ironman; 08-03-2011 at 10:52 AM. Reason: whoops typo and add
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post #32 of 44 Old 08-03-2011, 02:49 PM
Missouribound
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I just replaced my BBD with a Weber 32 / 36. No problems. I have NOT nuttered and probably will not. If I were you I would check for vacuum leaks, choke adjustment and timing...Well I kind of was you, and that's what I did. Everyone says do the nutter, but when I did the wiring for the nutter, I could not get it to start or even attempt to start. Sooo I put it back to original wiring and it started right up and runs absolutely great. I understand that that computer supposedly controls the timing....but apparently it does it in a way which helps performance. At least that is what I am seeing. Changing out the carb seems to be the key to better performance..
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post #33 of 44 Old 08-03-2011, 10:29 PM
monkeyhouse
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Originally Posted by Missouribound View Post
I just replaced my BBD with a Weber 32 / 36. No problems. I have NOT nuttered and probably will not. If I were you I would check for vacuum leaks, choke adjustment and timing...Well I kind of was you, and that's what I did. Everyone says do the nutter, but when I did the wiring for the nutter, I could not get it to start or even attempt to start. Sooo I put it back to original wiring and it started right up and runs absolutely great. I understand that that computer supposedly controls the timing....but apparently it does it in a way which helps performance. At least that is what I am seeing. Changing out the carb seems to be the key to better performance..
as long as you don't have emissions testing, the nutter is always a good choice. If yours didn't start after doing the nutter, chances are you did something wrong

First Jeep was an 1989 YJ, 6 cylinder 4.2L , 258. Nuttered and TeamRushed, Weber 38 DGES, Now, I'm venturing into the world of Grand Cherokees
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post #34 of 44 Old 08-04-2011, 03:13 AM
jeepdude1987
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So, JTH0033, you put the Motor Craft carb on and didn't do the Nutter bypass? Because if I understand you then this would probably be a major part of your problem. I have done the nutter by pass myself, and as I understand it (which is fairly well) the point of the nutter by-pass is that your computer is no longer messing with your timing so that you can then set your timing and it will run like a "normal" carbureted vehicle. And, as of = now since you haven't done the Nutter Bypass your computer is; 1) freaking out because it probably isn't getting all the info it should get from the sensors, 2) is trying to tune the carburetor for fuel mixture, and last but not least 3) jerking around your timing based off of the assumption that it is connected to all its sensors and the carburetor and still can sense and control what is actually happening with the whole system.

Unless, I am totally wrong about all this then I don't really know how anyone that changes out their carb, doesn't have a means of messing the new one into the emissions system could have their engine run well or ever pass an emissions test where they actually check the exhaust for chemical numbers.

1987 Wrangler YJ RED 4.2 5-speed, NP231, BFG 31x10.5R15 AT/KO on 15x8 gambler wheels.
Caution!!! Under construction!!!!!! Caution!!!
Finishing a 4.0 Cyl.head swap, Just got an AX-15 NP231J combo to replace the busted t-case and craptacular BA10/5. Adding Nutter bypass. Probably more to come before it is back as a DD!
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post #35 of 44 Old 08-04-2011, 03:12 PM Thread Starter
jth0033
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Yea I'm hoping to get my timing light tomorrow and have the nutter done tomorrow.
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post #36 of 44 Old 08-05-2011, 10:51 PM
monkeyhouse
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Yea I'm hoping to get my timing light tomorrow and have the nutter done tomorrow.
super! miss my timing light, stolen with all my tools. bummer. time to build up again!

First Jeep was an 1989 YJ, 6 cylinder 4.2L , 258. Nuttered and TeamRushed, Weber 38 DGES, Now, I'm venturing into the world of Grand Cherokees
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post #37 of 44 Old 08-05-2011, 11:22 PM Thread Starter
jth0033
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Welp timing light is taking way longer than I thought it was gonna take. Guess I should have just went and got one in the store. They say it should be shipped here Monday.
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post #38 of 44 Old 08-06-2011, 09:26 AM
csrcn2
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How much did you pay for it?
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post #39 of 44 Old 08-06-2011, 06:00 PM Thread Starter
jth0033
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Bought one from harbor freight. Cost me $15 shipped
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post #40 of 44 Old 08-06-2011, 07:26 PM
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Good deal
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post #41 of 44 Old 08-06-2011, 10:42 PM Thread Starter
jth0033
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Figured a timing light is a timing light and I won't be using it all that much. Shipped today, so I'm hoping I can wake up and complete the nutter. Hopefully she runs a little better once completed.
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post #42 of 44 Old 08-07-2011, 11:01 AM Thread Starter
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Done. Seems to run a 100% better than it did before. No more stumbling or drop of idle at stops. Now I just need to tuck the wires and make it look at nice.
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post #43 of 44 Old 08-08-2011, 06:16 AM
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Glad to hear ya got it all worked out!
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post #44 of 44 Old 08-08-2011, 06:20 AM
oldtime_ironman
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Originally Posted by jth0033 View Post
Done. Seems to run a 100% better than it did before. No more stumbling or drop of idle at stops. Now I just need to tuck the wires and make it look at nice.
Glad to hear that!
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