Jeep won't cut off - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Jeep won't cut off

Ruffstuff XJ Unirail Channel Reinforcement....Rugged Ridge Modular XHD Snorkel Now for both 3.8L and 3.6RIGID LED Light Blowout Sale - All Sizes, All Series, all

Reply
Unread 04-22-2013, 02:50 PM   #1
lbhutch03
Registered User
1989 YJ Wrangler 
 
Join Date: Aug 2012
Location: Olive Branch, MS, MS
Posts: 30
Jeep won't cut off

I have a 4.0 in my jeep. When I turn the key off the motor keeps running for another 10 to 15 seconds. It seems to keep running until it runs out of fuel. Any idea what could be causing this and how to fix this problem?

lbhutch03 is offline   Reply With Quote Quick reply to this message
Unread 04-22-2013, 03:29 PM   #2
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,698
Are you sure its not the 4.2? Was the engine swapped? Your year came with the 4.2 if i am not mistaken
__________________
1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
Siva283 is offline   Reply With Quote Quick reply to this message
Unread 04-22-2013, 03:39 PM   #3
lbhutch03
Registered User
1989 YJ Wrangler 
 
Join Date: Aug 2012
Location: Olive Branch, MS, MS
Posts: 30
Yeah the motor was switched to a 4.0.
lbhutch03 is offline   Reply With Quote Quick reply to this message
Unread 04-22-2013, 03:41 PM   #4
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,698
I got nothing for this issue with the 4.0. I am sure Que or Pete will be along shortly. They will get you straightened out.
__________________
1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
Siva283 is offline   Reply With Quote Quick reply to this message
Unread 04-22-2013, 03:47 PM   #5
roadyrob
Registered User
1987 YJ Wrangler 
 
Join Date: Apr 2007
Location: west palm beach fl
Posts: 1,827
couple of questions, is the 4.0 carbed or FI? when you say keeps running does it run smooth or rough? dieseling will do what you discribe but it won't be running smoothly. its caused by carbon build up in the motor.
__________________
Do everything with a positive attitude, it won't always work but you'll piss enough people off to make it worthwhile.

the voices aren't real but they sure have good ideas.
roadyrob is offline   Reply With Quote Quick reply to this message
Unread 04-22-2013, 05:00 PM   #6
lbhutch03
Registered User
1989 YJ Wrangler 
 
Join Date: Aug 2012
Location: Olive Branch, MS, MS
Posts: 30
It is fuel injected. Once I turn the key off, it will run smooth for about 5 seconds. Then I will start running a little rough until it dies.
lbhutch03 is offline   Reply With Quote Quick reply to this message
Unread 04-23-2013, 12:36 PM   #7
lbhutch03
Registered User
1989 YJ Wrangler 
 
Join Date: Aug 2012
Location: Olive Branch, MS, MS
Posts: 30
And if it is carbon build up, what causes this and how do I fix it?
lbhutch03 is offline   Reply With Quote Quick reply to this message
Unread 04-23-2013, 12:46 PM   #8
roadyrob
Registered User
1987 YJ Wrangler 
 
Join Date: Apr 2007
Location: west palm beach fl
Posts: 1,827
carbon build up is caused by a rich condition, usually doesn't happen to FI motors unless they have had a problem. what happens is the carbon gets hot and keeps igniting the fuel after shutdown. easiest cure is seafoam. heres a thread that tells you how to do it.
http://www.jeepforum.com/forum/f11/sea-foam-99405/
__________________
Do everything with a positive attitude, it won't always work but you'll piss enough people off to make it worthwhile.

the voices aren't real but they sure have good ideas.
roadyrob is offline   Reply With Quote Quick reply to this message
Unread 04-23-2013, 12:55 PM   #9
NonRubicon
Registered User
1990 YJ Wrangler 
 
Join Date: Nov 2009
Location: The southern armpit of California
Posts: 2,098
Check for any codes too. They'll alert you to any problems known to the computer.
NonRubicon is offline   Reply With Quote Quick reply to this message
Unread 05-12-2013, 05:38 PM   #10
lbhutch03
Registered User
1989 YJ Wrangler 
 
Join Date: Aug 2012
Location: Olive Branch, MS, MS
Posts: 30
Ok, after some digging around I found that I still have spark once I turn the key to the off position.. I found that if I pull the coil plug right after I turn the key off, the jeep dies. I put a test light on both wires going to the coil, and they are hot with the ignition off. Any ideas what is causing this?
lbhutch03 is offline   Reply With Quote Quick reply to this message
Unread 05-13-2013, 11:29 AM   #11
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,666
Yes, you need the diode across the alternator. I bet you are using the internally regulated alternator with the fuel injected system.

http://www.jeepforum.com/forum/f12/9...36-amp-610349/
Que89YJ is online now   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.