Misfiring... Reposted With Better Information, Please Help!!! - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-20-2011, 11:21 AM   #1
Newb
 
Join Date: Mar 2011
Posts: 12
Misfiring... Reposted With Better Information, Please Help!!!

My Jeep is a 2002 Wrangler X, (4.0L 6 Cylinder) with about 76,000 miles on it. It's been throwing misfire codes (all of them, each cylinder and random misfires) since March of this year.

Replaced a Oil Pressure Sending Unit a few months ago when the oil gauge went haywire... ripped a wire, spliced and replaced it... no problems.

Few weeks later, check engine light come on, engine dies... open the hood and the Crankcase Vent tube is laying on the crankcase... replace it, and the Crank Position Sensor (as indicated by the OBD) the first one was "bad" it too was replaced... After a few dozen miles, the misfire codes came back again.

Replaced the coil, plugs (regular Champion plugs)... It was time anyway... Check engine light still coming on after about 100 miles and if it gets over 65 mph or 3000 rpm....
The jeep would lurch and lose power at speed, definitely felt it misfiring...

Replaced the ECM, a mechanic I trust said it was bad... Engine Light still came on after about 100 miles and over 65 mph/ 3000 rpm...

Replaced the valve springs.... the engine felt and sounded great when I got it back... light just came on after, you guessed it about 100 miles and over 65 mph... Still feels and sounds great.... but the engine light reappeared again...

Replaced the Cam Position Sensor last week... More or less because it was easy and cheap it felt like I was doing something, but to no avail, after a few miles at highway speeds.. it was back...

It no longer feels like it is misfiring, as it did before the Valve Spring and ECM replacement... Bought an O2 sensor, got under the jeep and then realized there were three more of them...

I am at a loss... wondering if it's a shorting wire? Can't figure out why it doesn't "feel" like it's misfiring, but still throws the codes at a predictable interval... would love to hear ideas before I go buy three more O2 sensors... What have I missed Jerry Bransford????

Also... Are there "plug wires" that can be checked on an engine that uses a coil pack?? I have gotten lots of free advice that suggested plug wires... but that seems to be the whole point of a coil pack...

Bought some double platinum Champion plugs, but haven't put them on yet... Both me and my mechanic are stumped...

Thanks!

sdh796 is offline   Quote Quick Reply
Old 06-20-2011, 01:12 PM   #2
MallCrawler

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 31,471
Wow. Hope u get an answer
__________________
2007 Rubicon/Rock Krawler TR 2.5 coils/rear TB/Rancho 9000 31/32XL shocks/Teraflex monster TB/Synergy highsteer,tie rod, ball joints/Hankook MT 315-75-16 on Level 8 ZX's/MC front SB links/Rancho geo brackets & shocks/Fox ATS stabilizer/Adams front DS=Frankinlift from hell.

Lifting your JK? Read this!!



Click HERE to become a WranglerForum Supporting Member!
kjeeper10 is online now   Quote Quick Reply
Reply

Tags
engine light , misfire , sensor , valve

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
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

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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
New to Jeeps! Information wanted. Yeroc1337 WF New Member Check In 14 06-22-2011 06:15 AM
WOHVA's Spring '11 Trails Information Meeting deadhead Wisconsin Jeep Forum 1 01-24-2011 10:28 AM
Obama has nothing better to do???? jpdocdave Off-Topic 71 04-23-2009 08:33 PM
Full size Jeep, SJ information hutchman General Jeep Discussion 1 10-24-2007 02:10 PM



» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 03:03 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC