dieseling - Page 2 - JeepForum.com

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post #16 of 24 Old 11-24-2011, 03:45 PM
pasinbuy
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1994 YJ Wrangler 
 
Join Date: Feb 2007
Location: florida
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Quote:
Originally Posted by Karma View Post
HI All,
I think many of you are missing the point. After you turn off the ignition, THERE IS NO SPARK. THEREFORE THE PROBLEM CANNOT HAVE ANYTHING TO DO WITH IGNITION TIMING. There is no spark to light things off.

Sparky

Karma, you probably do not know this but. TYPING IN CAPS IS YELLING.

TYPING IN BOLD CAPS IS SCREAMING... I am sure that you did not mean it, Now you know.

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post #17 of 24 Old 11-24-2011, 04:12 PM
jsawduste
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2006 YJ Wrangler 
 
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Sorry guys but each of you mean well but are a little confused.

Yes dieseling is caused by hot spots in the combustion chamber. It can be exacerbated by overly rich mixtures and excessive ignition timing.

Carbs are broken down into various circuits. Each circuit has it`s own function. At closed throttle the throttle plate has only the idle ports in the venturi open. Thus the idle mixture is controlled by the idle mixture screws.

I am not going to go in detail on how each circuit works but suffice to say that each circut has a function and is adjustable.


Daffy`s problem is none of the above. His is a problem with inconsistent idle speed. As he says, "If the idle is back down to 700 rpm it shuts off but at 1200 it diesels".

Daffy, you need to figure out if the throttle return spring is weak. The cable kinked or something is touching the linkage preventing the idle speed from consistently returning to the 700 rpm figure. Fix that then try adjusting the idle mixture for best performance. Which, if you don`t know how there is a plenty of information on the net.
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post #18 of 24 Old 11-24-2011, 05:28 PM
Karma
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1989 YJ Wrangler 
 
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Location: White Rock, NM
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Quote:
Originally Posted by pasinbuy View Post
Karma, you probably do not know this but. TYPING IN CAPS IS YELLING.

TYPING IN BOLD CAPS IS SCREAMING... I am sure that you did not mean it, Now you know.
HI pasin,
NO, I do know it. I meant to scream since no one seemed to be paying attention. Screaming is a mode of expression, you know.

Sparky
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post #19 of 24 Old 11-24-2011, 05:31 PM
TJRUSSELL
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2005 TJ Wrangler 
 
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Location: Buffalo, NY
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rebuild the carb its probally leaking fuel into the intake

My 2.4 turbo TJ-6 stretch build
http://www.jeepforum.com/forum/f22/my-lil-2-4-tj-build-1092494
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post #20 of 24 Old 11-25-2011, 04:37 PM Thread Starter
bluedaffy
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point
Posts: 291
Thanks for all of the helpful replies. Can anyone tell me, how do you adjust fuel/air mixture?

jsawduste- you got it, that's my problem in a nut shell. Maybe it will help you or someone diagnose my problem by telling you this ---> When I got the jeep it wouldn't idle, so I cleaned out the idle tubes, and put them back in (I did NO changes to anything else on the vehicle whatsoever other than clean the tubes and put them back). This marks the exact moment that my YJ started to diesel. I probably should have mentioned this fact earlier cause it seems like good evidence for my problem.

By the way, I found a cracked hose and replaced it, my idle is now down to around 900... Still diesels...

Once again my YJ is a 4.2L with the computer.
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post #21 of 24 Old 11-25-2011, 06:04 PM
jsawduste
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Define idle tubes. Make and type of carb.

Your description is to broad to ascertain just what the next step would be.

You did`nt Google how do you adjust idle fuel/air mixture. It`s out there but you it would be helpful to know what carb you have..
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post #22 of 24 Old 11-25-2011, 08:02 PM Thread Starter
bluedaffy
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point
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Sorry, I overlooked that fact, it's stock... so the carter bbd carb.
I think 'idle tubes' are the correct term though I may be wrong, they are the tubes in the venturi cluster that jet fuel during idle (they were clogged as I hear the carters commonly are)

Another note: the rich/lean needles are always buried to the inside of the carb when I look down in it, but I have seen them move a bit before so I assume the computer is working I'm just not sure what that means. Just trying to give as much info as I can.
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post #23 of 24 Old 11-25-2011, 08:23 PM
bioblitz
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1989 YJ Wrangler 
 
Join Date: Nov 2011
Location: Vancouver
Posts: 2
Figure out the nutter by-pass! All of the emissions crap on there is telling the ignition/timing how to burn. if your emissions equipment is not emaculate, or if you have modified anything, it will throw the whole system off. BY-PASS it! you wont regret it.

Search the forum for the nutter in detail. It's pretty easy. You just cut the orange and purple wires that come out of the firewall and go to the distributor then cut the same colored wires leading to the ECM in the fender. You splice in a new set of wires (color to color) from the ecm to the distributor. Oh, yeah, if you twist the spliced length of wire it wil reduce the electrical interference.

some say bypassing emissions is bad, but i garontee it'll run more eco-friendly (burn more efficient) after you by-pass.
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post #24 of 24 Old 11-28-2011, 10:45 AM Thread Starter
bluedaffy
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point
Posts: 291
bioblitz- Thanks for the suggestion. I actually tried to do the nutter last week and couldn't get it to work and since my jeep is a daily driver so it can't really be out of commission for me, so I got intimidated and rewired to the computer. The reason I couldn't figure it out is because I have an aftermarket Jacobs electronics unit and it doesn't have purple and yellow wires, the wiring looks different with different colors and I couldn't really figure out what goes where.

I would LOVE to do the nutter, but I'll have to take some time to figure out how.
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diesel , idle , idle problems , idle speed , shutting off

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