Random Misfire - What else can i fix!? - JeepForum.com
 
LinkBack Thread Tools
post #1 of 8 Old 04-13-2011, 08:00 PM Thread Starter
enjoithis
Registered User
1999 WJ 
 
Join Date: Mar 2011
Location: port jefferson
Posts: 48
Question Random Misfire - What else can i fix!?

I have a 99 Grand Cherokee Limited, v8 with 160k miles on it
I continue to get codes P0202 -0207

So far I have changed injectors, throttle position sensor, fuel filter, and spark plugs. The issue is very intermittent, it seems to drive fine for the first 5-10 minutes every time, and then it starts to misfire badly. It will also go away after driving for some time, and randomly come back again. Any suggestions?

enjoithis is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 04-14-2011, 03:37 AM
devis
Registered User
2000 WJ 
 
Join Date: Feb 2011
Location: Concord
Posts: 44
I've experienced the same exact thing on my Infiniti J30. At close to 200k it started to behave like so... didn't pass smog, i was told to replace the O2 sensors. That, along with a tuneup brought it back to normal.
devis is offline  
post #3 of 8 Old 04-10-2012, 12:51 PM
mybabyjasper
Registered User
1996 ZJ 
 
Join Date: May 2009
Location: Bordentown, NJ
Posts: 19
I've had the same problem in my 96, but I changed O2 sensors and the codes still keep coming back intermittently (changed spark plugs, wires, tailpipe, checked cat)
mybabyjasper is offline  
post #4 of 8 Old 04-10-2012, 04:47 PM
FrankU
Registered User
2004 WJ 
 
Join Date: Nov 2011
Location: Babylon
Posts: 190
Had a similar problem with a Chevy Suburban. It ended up being the wires.

04 WJ 4.0, OME Kolak 3" lift, Addco's F&R ,18" JK Sahara's
FrankU is offline  
post #5 of 8 Old 04-10-2012, 05:05 PM
wjjeeplkstevens
Registered User
2001 WJ 
 
Join Date: Jul 2011
Location: Lake Stevens
Posts: 130
I had a similar issue on my jeep a when i first got it, could not find the source of a misfire on cyl 7 code. After I finally gave up replacing things myself (plugs, coil packs, fuel injectors etc.) i took it into the shop and after doing a compression/leak down test they determined it was a burnt valve... a full head job and $1500 later she purred like a kitten again (not that it really ran that rough before, just a slightly rough idle and the check engine light...) I hope this is not your case, but i thought i would throw that out there anyway...

2001 WJ - 5 / 4.5 inch lift- Clayton coils, IRO long arms, IRO Rear Adjustable A-arm and lowers, Bilstein 5125 shocks, ADDCO 684 Sway bar. Carolina Driveline double cardan conversion rear DS 255/75/17 BFG MT KM2's on Rubicon Rims. K&N CAI, 04 HO Intake Manifold, 3 in y-pipe back exhaust. 55w HIDs. JL audio upgrade
wjjeeplkstevens is offline  
post #6 of 8 Old 04-10-2012, 05:49 PM
mybabyjasper
Registered User
1996 ZJ 
 
Join Date: May 2009
Location: Bordentown, NJ
Posts: 19
Kj

Quote:
Originally Posted by wjjeeplkstevens View Post
I had a similar issue on my jeep a when i first got it, could not find the source of a misfire on cyl 7 code. After I finally gave up replacing things myself (plugs, coil packs, fuel injectors etc.) i took it into the shop and after doing a compression/leak down test they determined it was a burnt valve... a full head job and $1500 later she purred like a kitten again (not that it really ran that rough before, just a slightly rough idle and the check engine light...) I hope this is not your case, but i thought i would throw that out there anyway...
Oh dear God I hope not, but it's looking like I'll have to take it in. A similar thread said check the PCM and there's a YouTube vid for how to fix it... That'll be my first (sixth) check, then it's to the shop (luckily we have a jeep specialty shop by me called No Excuses).
mybabyjasper is offline  
post #7 of 8 Old 10-10-2012, 06:30 PM
dielawn
Registered User
1999 WJ 
 
Join Date: Jul 2012
Location: Indianapolis
Posts: 34
What ended up being the problem?

99 WJ used for pulling gear!!!

www.facebook.com/ritualsindy
www.reverbnation.com/rituals
dielawn is offline  
post #8 of 8 Old 10-10-2012, 10:24 PM
mybabyjasper
Registered User
1996 ZJ 
 
Join Date: May 2009
Location: Bordentown, NJ
Posts: 19
Mine ended up being a cylinder/valve problem. With it being a 96 and given me such a good run, I'm not spending the $2G to fix it. Small issue, too much labor to get to :-(
Good luck OP

Last edited by mybabyjasper; 11-27-2014 at 11:30 PM.
mybabyjasper is offline  
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.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
4.7 misfire Ttech040 WJ Grand Cherokee Forum 3 02-20-2011 07:09 PM
WJ 4.7 Misfire skeletor88 WJ Grand Cherokee Forum 7 01-24-2011 01:30 PM
02 4.0 WJ misfire Blktjsport WJ Grand Cherokee Forum 1 09-06-2010 12:02 AM
Another misfire (4.7L) adipietra WJ Grand Cherokee Forum 2 05-30-2010 05:48 AM
4.7 misfire wee_____man WJ Grand Cherokee Forum 3 05-12-2010 09:10 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome