Engine runs rough intermittently, runs rich... - 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 > TJ Wrangler Technical Forum > Engine runs rough intermittently, runs rich...

RIGID LED Light Blowout Sale - All Sizes, All Series, all ECGS Black Friday Sale!!6th Annual, Beat Your Wife to the Credit Card Sale!

Reply
Unread 10-17-2008, 06:24 AM   #1
Cactus737
Registered User
1997 TJ Wrangler 
 
Join Date: Oct 2008
Location: RI
Posts: 3
Engine runs rough intermittently, runs rich...

My check engine light came on so I changed the oxygen sensor. It still runs rough occasionally and the exhaust really stinks like it's running rich. It almost seems to misfire like the ignition timing is off. Could it be the vacuum? Is this a common problem? Is there an easy fix? Thanks, Scott.

Cactus737 is offline   Reply With Quote Quick reply to this message
Unread 10-17-2008, 06:52 AM   #2
Rocky529
Jeep
 
Rocky529's Avatar
2004 TJ Wrangler 
 
Join Date: Jul 2004
Location: Park City, Utah
Posts: 13,187
Pull the code.
__________________
2004 Jeep Wrangler Sport - 5 speed

Silver Metallic finish with black dual tops - Dana 44 Rear
2.25" Suspension Lift with Old Man Emu Shocks
Performance Accessories 1" Body Lift
Daystar 1" Motor Mount Lift
Spidertrax 1.25" Wheel Spacers - 32"x11.5" MT/R Tires
Rocky529 is offline   Reply With Quote Quick reply to this message
Unread 10-17-2008, 07:50 AM   #3
lilboy1023
Registered User
2001 TJ Wrangler 
 
Join Date: Sep 2008
Location: Indianapolis
Posts: 514
I agree with pulling the code. It could be a clogged cat.
lilboy1023 is offline   Reply With Quote Quick reply to this message
Unread 04-22-2010, 08:20 AM   #4
Cactus737
Registered User
1997 TJ Wrangler 
 
Join Date: Oct 2008
Location: RI
Posts: 3
Still Running Rough

Changed the spark plugs and wires and put in a new ignition coil and still runs rough. I'm at my wits end. Any more ideas? Thanks.
Cactus737 is offline   Reply With Quote Quick reply to this message
Unread 04-22-2010, 08:25 AM   #5
Alex74012
Registered User
2004 TJ Wrangler 
 
Join Date: Dec 2009
Location: BA OK
Posts: 641
dont throw parts at it,just pull the stinkin codes
__________________
that dd rubi on 37's
Alex74012 is offline   Reply With Quote Quick reply to this message
Unread 04-22-2010, 08:32 AM   #6
Wheelin98TJ
JEEP FREAK
 
Wheelin98TJ's Avatar
1998 TJ Wrangler 
 
Join Date: Apr 2004
Location: , Southeast MI
Posts: 24,775
You don't even need a scanner to pull the code.

You can do it yourself in seconds. Here's how:

How do I retrieve diagnostic trouble codes when there is a check engine light illuminated?
Wheelin98TJ is online now   Reply With Quote Quick reply to this message
Unread 04-22-2010, 08:50 PM   #7
Cactus737
Registered User
1997 TJ Wrangler 
 
Join Date: Oct 2008
Location: RI
Posts: 3
Already HAD pulled the codes. Indicated miss-firing on various cylinders. No further codes.
Cactus737 is offline   Reply With Quote Quick reply to this message
Unread 04-22-2010, 09:40 PM   #8
Wheelin98TJ
JEEP FREAK
 
Wheelin98TJ's Avatar
1998 TJ Wrangler 
 
Join Date: Apr 2004
Location: , Southeast MI
Posts: 24,775
Well it helps to state what the codes were and that you did pull them.

Did you also replace the cap and rotor?

What kind of replacement plugs did you use?

Have you done a compression test on the cylinders that the misfire codes refer to?
Wheelin98TJ 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


Suggested Threads





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.