A half Nutter - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 07-17-2003, 12:41 AM
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A half Nutter

Hi All,

My mother has a 83 CJ7 Auto and completely stock that
she bought new. She has driven it little in the last 5
years due to poor idle and other problems.

We live in California so to get tags everything has to
work. And with only 80,000mi the old jeep passed with
flying colors. It's just not very drivable for a retired
grandmother. Low speed stalls kill the PS and grandma
does not like that.

I've been diddling with it for the last 6 months and I
fixed everything but the idle. So I started searching
the internet and found this forum where the archives
pointed me to everything I needed to know. The carb
is junk. Simple really.

So I did a half Nutter. That is I screwed in the idle
screws till the plunger was fully forward and unluged
the plug at the back of the carb. Reset the idle screws,
reset the idle - it was way up - and that's it. It ran
too good to be true. Shocking really. Idles better
than new.

Now this modification is of course for off road use
only and it has the advantage of being really easy to
undo if I wish to drive on public roads or get a smog
test. Just plug it in.

My question is, is this a huge mistake? Can the computer
controlled ignition working with a non computer controlled
carb cause long term problems.

Also, I live at 6000' elevation and rarely go below 4500'.
I have the high elevation wire grounded. Should I try
stoping the stepper motor needles at less than full rich?
As a long time motorcyclest and seat of the pants
mechanic, it feels like its running rich. I'll give it
the Lone Pine Rd test tommorow, 3000' gain in 8 miles,
and post a report.

Thanks for all the good info.

Pat
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post #2 of (permalink) Old 07-17-2003, 02:21 PM
 
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Re: A half Nutter

I'm not the best person to answer this so I'll bring it back up to the front for you.
Be sure to fill your profile out all the way(I'm suprised LEVE hasn't said anything yet), welcome to the board.
Try to find RRich, he might be able to help you.
Are you talking about Lone Pine CA?
I used to live in Ridgecrest.
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post #3 of (permalink) Old 07-17-2003, 02:38 PM
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Re: A half Nutter

Im having the same idle/stall problem with my 82 CJ7 V8 auto. It has the factory 2bbl motorcraft carb. What exactly did you do to fix it? Down here where i live we dont emissions so i dont have to worry about that. Some more detailed instructions would be nice. I would really appreciate it.
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post #4 of (permalink) Old 07-17-2003, 03:05 PM
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Re: A half Nutter

1. Pat, welcome to the forum.
2. Thanks for filling out your user profile.
3. Read the New Posters Message at the top of the forum.
4. Participate more often!
5. Two brains are always better'n one!
6. What you propose could do some damage...
7. If you don't have the mixture screws setting correct.
8. If the mixture is too rich you chance washing down the cylinder walls,
9. Leading to engine failure.
10. That's my first concern.
11. If there is an advanced timing problem,
12. On a hill, as example,
13. And it starts to ping,
14. The knock sensor will retard the timing about 2*,
15. To compensate for the ping,
16. But the mixture won't change.
17. That could be a minor problem.
18. Otherwise... I don't think you'd do long term damage.
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post #5 of (permalink) Old 07-17-2003, 04:14 PM
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Re: A half Nutter

I believe the Nutter Bypass only applies to the Carter BBD carb. It won't work on your 2100. If you post your problem in a new topic or do a search for the 2100, you will find more info than you can imagine.
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post #6 of (permalink) Old 07-17-2003, 05:23 PM
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Re: A half Nutter

How do i know if my carb is a bbd or 2100? It reads D2FM FB and under that it says A 1G 19 all on the tag. Any solutions?
post #7 of (permalink) Old 07-17-2003, 10:51 PM
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Re: A half Nutter

The Nutter Bypass applies only to 83-85 258's

http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/

Good Luck

Pat
post #8 of (permalink) Old 07-17-2003, 11:15 PM
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Re: A half Nutter

Hey 304, if it's a motorcraft, it should be the 2100, one of my buddies is running the same carb on the 360 we put in his 86. And oh, by the way, Hold on to your stuff because I guarantee you that Hall County will have emissions within a couple of years.
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post #9 of (permalink) Old 07-17-2003, 11:20 PM
 
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Re: A half Nutter

</font><blockquote><font class="small">In reply to:</font><hr />
The Nutter Bypass applies only to 83-85 258's


[/ QUOTE ]

The Nutter Bypass is for all 258s, not just the aformentioned, but any Jeep with the 4.2 computer controlled BBD.
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post #10 of (permalink) Old 07-18-2003, 04:34 PM
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Re: A half Nutter

Thanks for the help. Today i took the carb off and took it apart and cleaned throughly with carb cleaner. It now runs like a charm and will burn off the 33's even with the 2.73 gearing. Nice. The only problem i have is that if you quickly press the throttle to the floor and then let it back off it dies. I dont know a whole lot about carbs and i think that this a normal flooding but i just wanted to check. Thanks
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