help please - 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 Cherokee & Comanche Forums > XJ Cherokee Technical Forum > help please

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineSavvy Billet LED Tail LightsWant to be able to SEE? DOT Approved Headlights for under

Reply
Unread 06-21-2013, 06:56 PM   #1
ae1440
Registered User
 
Join Date: Jun 2013
Location: tulsa, Oklahoma
Posts: 9
Help me out please

i have a 98 cherokee limited 4.o 230k miles
its been giving me trouble ideling after warm and terrible mpg and a real bad sputtering on the highway!

Just did a full tune up plugs wires oil change. still nothen.
took and cleaned the idle control valve and that helped in town but not mpg or sputtering...

replaced a broke O2 sensor fuse then cleaned the O2 sensor in town it seemed much better but then got on the highway and its sputtering as if its gasping for air and mpg is 10-12 used to be a low of 18- and high of 22

also replaced the oil pressure switch since that gauge was dancing and that helped that issue


for the life of me i cant find or figure out why the highway is so terrible on mpg and car doesn't excel or hold gas without sputtering terribly


Last edited by ae1440; 06-22-2013 at 01:55 PM..
ae1440 is offline   Reply With Quote Quick reply to this message
Unread 06-21-2013, 07:33 PM   #2
sAe23
Registered User
1995 XJ Cherokee 
 
Join Date: Apr 2009
Location: Los Angeles / SFV, California
Posts: 2,578
Maybe your CAT is clogged?
Do a highway run to get it up to running temp then check to see if the CAT is glowing.
Or take it to a good smog tech and they can test it...
sAe23 is offline   Reply With Quote Quick reply to this message
Unread 06-21-2013, 07:35 PM   #3
ae1440
Registered User
 
Join Date: Jun 2013
Location: tulsa, Oklahoma
Posts: 9
Quote:
Originally Posted by sAe23 View Post
Maybe your CAT is clogged?
Do a highway run to get it up to running temp then check to see if the CAT is glowing.
Or take it to a good smog tech and they can test it...
i forgot to add my cat was replaced brand new about 3 months ago

and tomorrow i have parts arriving for fan clutch and new water pump

Last edited by ae1440; 06-21-2013 at 07:59 PM..
ae1440 is offline   Reply With Quote Quick reply to this message
Unread 06-22-2013, 02:22 PM   #4
sAe23
Registered User
1995 XJ Cherokee 
 
Join Date: Apr 2009
Location: Los Angeles / SFV, California
Posts: 2,578
What plugs did you use?
sAe23 is offline   Reply With Quote Quick reply to this message
Unread 06-22-2013, 09:22 PM   #5
ae1440
Registered User
 
Join Date: Jun 2013
Location: tulsa, Oklahoma
Posts: 9
i cant remember what plugs whatever orieley carries... i just found out it had a p0171 error says its running lean.. getting a new upstream o2 sensor tomorrow hoping that helps
ae1440 is offline   Reply With Quote Quick reply to this message
Unread 06-23-2013, 06:04 AM   #6
JMH21814
Registered User
1997 XJ Cherokee 
 
Join Date: Jan 2013
Location: Enfield, CT
Posts: 260
This may be a silly question, but is your exhaust manifold cracked? Mine was and my mpgs dropped in half. Also, added air (oxygen) entering before the upstream O2S will trick the sensor into thinking your running lean, therefore, CPU will dump more gas into cylinders possibly causing slight wet fouling (slight skip) and P0171 (lean bank 1). Very interested in what you find, please keep us informed. Good luck!
JMH21814 is offline   Reply With Quote Quick reply to this message
Unread 06-23-2013, 09:07 AM   #7
AmbuGrl
Web Wheeler
 
AmbuGrl's Avatar
1998 XJ Cherokee 
 
Join Date: Oct 2009
Location: Virginia Beach, Va
Posts: 2,409
Trace all of the wires on your upstream sensor. Ours has similar issues and we had a broken wire. (same code too) We fixed it and replaced the sensor, no more issues.
__________________
- HM1(SW/AW)Ret USN Dec 23,1992 to Dec 31, 2012

I drive an XJ, and all of my power windows work :)



2000 Pontiac WS6 - DD
DD (Mine) Sold - 98 XJ Moss Green
(His) - 92 YJ December 2013 YJOTM

Sold - 95 ZJ
Sold - 97 XJ Red
Sold - 98 XJ


USN Jeep Club Hull #36
NAXJA #3700

Quote:
Originally Posted by RacerX View Post
WTF is Clockspring??? my Jeep has digital clock
AmbuGrl is offline   Reply With Quote Quick reply to this message
Unread 06-25-2013, 08:13 AM   #8
ae1440
Registered User
 
Join Date: Jun 2013
Location: tulsa, Oklahoma
Posts: 9
The wires are all attached, also i did have to splice a year ago because of that reason!... will check manifold but unsure what exactly to do other than look at it i guess? Theres so much grease buildup so ill have to clean it first but i will update soon!
ae1440 is offline   Reply With Quote Quick reply to this message
Unread 06-28-2013, 08:55 AM   #9
ae1440
Registered User
 
Join Date: Jun 2013
Location: tulsa, Oklahoma
Posts: 9
update

i didnt see any crack in the exhaust manifold, next i looked at fuel injectors... manually unplugged one at a time! One in particular after being unplugged didn't seem to foul the engine any more than when it was plugged in... so i ordered a set of bosh fuel injectors to arrive early next week and i'll update then!


Any suggestions or tips for changing out fuel injectors?!?!
ae1440 is offline   Reply With Quote Quick reply to this message
Unread 06-28-2013, 03:00 PM   #10
sAe23
Registered User
1995 XJ Cherokee 
 
Join Date: Apr 2009
Location: Los Angeles / SFV, California
Posts: 2,578
Maybe you should test the circuit first??
sAe23 is offline   Reply With Quote Quick reply to this message
Unread 07-08-2013, 09:16 AM   #11
ae1440
Registered User
 
Join Date: Jun 2013
Location: tulsa, Oklahoma
Posts: 9
New injectors help with MPG but doesnt cure my problem, reset CEL going to see if it poulls the same code later today
ae1440 is offline   Reply With Quote Quick reply to this message
Unread 07-12-2013, 02:57 PM   #12
ae1440
Registered User
 
Join Date: Jun 2013
Location: tulsa, Oklahoma
Posts: 9
gas mileage dropped suddenly to well below 12 oh highways when i was getting 18-20, idles still feel like engine will die and it has almost no acceleration unless its to the floor and even that my check engine light blinks when i do accelerate
ae1440 is offline   Reply With Quote Quick reply to this message
Unread 07-12-2013, 03:19 PM   #13
ae1440
Registered User
 
Join Date: Jun 2013
Location: tulsa, Oklahoma
Posts: 9
replacing throttle position sensor next, some threads having the same symptoms say this fixed them
ae1440 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.