Cylinder 1 Misfire on 1999 6cyl Sahara - 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 12-11-2010, 02:44 PM   #1
Jeeper
 
JDaviesspy's Avatar
 
Join Date: Dec 2010
Location: North Florida
Posts: 23
Cylinder 1 Misfire on 1999 6cyl Sahara

I have a 1999 Sahara 6cyl and I intermittently have the check engine light come on and code reads "Cylinder 1 misfire". When this happens the engine runs a tad rough, but not very bad. The rough idle passes and the code can be cleared usually within a hour. Engine runs very smooth and I have great throttle response.I have replaced the plugs, wires, cap, and even put in upgraded fuel injectors (Precision Injectors), but I still get the code 2 or 3 times a month, Is it the cam/crank shaft sensor??? If it was a cylinder issue is would not be intermittent...right?

In advance, your input and assistance is appreciated!

JDaviesspy is offline   Quote Quick Reply
Old 12-11-2010, 03:32 PM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,238
Images: 2
That sounds like the notorious misfire caused by a bad set of weak valve springs some early TJ 4.0L engines received. My '97 TJ had the same issue. I fought that issue for years before the factory addressed the issue with a TSB. The TSB basically just says to replace the valve springs with new valve springs which uses the same p/n, they are just updated, and to clean the combustion chambers with Mopar CCC (combustion chamber cleaner).

__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 12-11-2010, 03:56 PM   #3
Jeeper
 
JDaviesspy's Avatar
 
Join Date: Dec 2010
Location: North Florida
Posts: 23
Thanks Jerry! I had seen the TSB during my search, but was hoping it was something else and an easier and less expensive fix. Looks like I will have to bite the bullet! I appreciate your quick response. Thanks!!!
JDaviesspy is offline   Quote Quick Reply
Old 12-11-2010, 04:29 PM   #4
Jeeper
 
Join Date: Sep 2010
Posts: 315
Images: 3
I just fixxed that very same thing on my '97 TJ. New valve springs, "Deglazed" the valves with H2o, New spark plugs after . All is gooood now !

PS: A big "THANK YOU" to Jerry for all the info !
XtrmTJ is offline   Quote Quick Reply
Reply

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:
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
My Clutch Problems and How I Resolved Them linz TJ Tech Forum 7 08-30-2014 07:36 AM
Misfire cylinder 1 crpmap General Jeep Discussion 21 07-08-2011 11:59 PM
Arrgh.. Cylinder 6 misfire... cosmo TJ Tech Forum 5 01-31-2010 07:18 PM
HELP..cylinder 6 misfire. 4x4gal TJ Tech Forum 24 07-18-2009 08:19 AM
Runing rough, idle rough, cylinder #4 misfire spdrcrpete TJ General Discussion Forum 13 06-02-2008 02:32 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 04:36 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