jeep yj backfiring when shuting 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 yj backfiring when shuting off

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineGrizzly Lockers available at Rockridge4wd.comThe ULTIMATE "Selectable" Locker System! Brough

Reply
Unread 04-05-2013, 11:00 AM   #1
Burtman88
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2010
Location: Palatine, illionois
Posts: 432
jeep yj backfiring when shuting off

So i ve been having a problem with my 87 2.5 yj backfiring after i shut it off. It seems to just backfire not sputter. I replaced all the vacuum lines, spark plugs,plug wires,fuel filter,new muffler no cat co verter, and also replaced exaust manifold.
So after most of this my idle went from 1500 to around a 1000 or 1200 which is still very high. It idles at 900 when cold but warms up to the others rpms i just said. So before i had back fire everyonces in awhile. I just replaced my 02 sensor now it back fires everytime i turn off the yj which is annoying and scares ppl around me. Its been 3000 miles since the exaust manifold swap and fix. It does sound like i have a exaust manifokd leak again which would suck since i paid someone else to do it. Do i need to reset ecm for the new 02 sensor all i did was disconnect battery for 20 mins. Ill get a video of it soon running and how it sounds.

__________________
87 YJ 2.5 inch lift 1 inch shackle BF AT 33-1250-r15

00 WJ

09 WK Hemi, 2.5 inch Rc lift, Super chips,Gibson 3 inch catback, rough country spacers, Voolant Cai,lockpik, Falken Wild peak At 265/70R-18
Burtman88 is offline   Reply With Quote Quick reply to this message
Unread 04-05-2013, 11:10 AM   #2
Jax89Jeeper
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2011
Location: Jacksonville, Florida
Posts: 345
Have you checked your timing? Your idle is too high and needs adjusted which can be caused with timing too advanced, this can also create a backfire situation.
Jax89Jeeper is offline   Reply With Quote Quick reply to this message
Unread 04-05-2013, 11:32 AM   #3
Burtman88
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2010
Location: Palatine, illionois
Posts: 432
Where would i take it to get timing done i have never done this before. Also what i be looking at for price of changing timing.
__________________
87 YJ 2.5 inch lift 1 inch shackle BF AT 33-1250-r15

00 WJ

09 WK Hemi, 2.5 inch Rc lift, Super chips,Gibson 3 inch catback, rough country spacers, Voolant Cai,lockpik, Falken Wild peak At 265/70R-18
Burtman88 is offline   Reply With Quote Quick reply to this message
Unread 04-05-2013, 01:01 PM   #4
Jax89Jeeper
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2011
Location: Jacksonville, Florida
Posts: 345
Quote:
Originally Posted by Burtman88
Where would i take it to get timing done i have never done this before. Also what i be looking at for price of changing timing.
Any shop can handle this... The price is hard to guess. It can vary quite a bit. Just make sure the shop will not perform any work until you have been quoted and okayed the price.
Jax89Jeeper is offline   Reply With Quote Quick reply to this message
Unread 04-05-2013, 04:15 PM   #5
Xpress
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2010
Location: The Great Big Box, California
Posts: 5,807
Pick up a timing gun and a service manual and check it yourself, don't pay someone else to do the work. These things are incredibly easy to work on.

By the way you need to disconnect the positive battery terminal and ground it out on the NEGATIVE terminal for 30 seconds to drain the caps inside of the computer to reset it.
__________________
[URL="http://www.jeepforum.com/forum/f12/another-5-2l-yj-thread-1503048/"]My 5.2L Build thread[/URL]

-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
[QUOTE=mudsweatNgearz;21162729]Leave em off and weld an I beam on. Bumperetts just scream homo.[/QUOTE]
"A well regulated Militia, being necessary to the security of a free State, the [B][I]RIGHT[/I][/B] of the people to keep and bear Arms, [B][I]SHALL NOT BE INFRINGED[/I][/B]."
Xpress is offline   Reply With Quote Quick reply to this message
Unread 04-05-2013, 05:11 PM   #6
Burtman88
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2010
Location: Palatine, illionois
Posts: 432
ohh ok thanks, i didn't know i had to reset the comp. I ll try to do the timing my self then i don't feel like paying fro labor anymore than i already have. Also i think its also a vacuum leak i am having with the high idle also. I just went out and hit a huge mud hole to fast it filled my whole engine bay with slimy mud accept for the intake luckily. Now since that happened my idle is down to around 700 to 1000 which is hilarious since the mud did a temp seal somewhere. The only place i can guess thats leaking is on top of the valve cover gaskets. I can lift them up with out any effort like they are to wide to seal to valve cover and both are 3 months old. Its the breather in the back and the pcv in front grommets may be my issue. So iam wondering if this could cause it or are the grommets suppose to be very loose.
__________________
87 YJ 2.5 inch lift 1 inch shackle BF AT 33-1250-r15

00 WJ

09 WK Hemi, 2.5 inch Rc lift, Super chips,Gibson 3 inch catback, rough country spacers, Voolant Cai,lockpik, Falken Wild peak At 265/70R-18
Burtman88 is offline   Reply With Quote Quick reply to this message
Unread 04-05-2013, 05:20 PM   #7
Burtman88
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2010
Location: Palatine, illionois
Posts: 432
Heres the engine bay with to much mud
imag0104.jpg   imag0105.jpg   imag0106.jpg   imag0102.jpg  
__________________
87 YJ 2.5 inch lift 1 inch shackle BF AT 33-1250-r15

00 WJ

09 WK Hemi, 2.5 inch Rc lift, Super chips,Gibson 3 inch catback, rough country spacers, Voolant Cai,lockpik, Falken Wild peak At 265/70R-18
Burtman88 is offline   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.