runs great cold but when warm it runs bad. - JeepForum.com

 
LinkBack Thread Tools
post #1 of 5 Old 06-23-2011, 08:38 PM Thread Starter
flaneryjunior99
Registered User
1999 XJ Cherokee 
 
Join Date: Jun 2011
Location: Elkhorn City
Posts: 3
runs great cold but when warm it runs bad.

my jeep runs great when cold but when up to operating temp it runs like crap, i checked the fuel pressure its good, no vaccum leaks, i can hook it up on a OTC Genysis it will show a ingnition coil #1 and #2 but i cleared it didn't come back on . I can watch it with the genysis when idling or driving no misfires on any cylinders. Could it be the ingnition coil bar?

flaneryjunior99 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 06-23-2011, 09:08 PM
xjfever
Web Wheeler
 
xjfever's Avatar
1995 XJ Cherokee 
 
Join Date: Feb 2008
Location: north Ga.
Posts: 14,216
It could be that it is suffering from heat soak which is common for a failing electrical component. Once it gets to a certain temp it doesn't work correctly but functions fine when cool.

  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
xjfever is offline  
post #3 of 5 Old 06-24-2011, 01:21 AM
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Posts: 19,793
Also possible bad o2 sensor. Fuel trims running stupid rich or lean?

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

ratmonkey is offline  
post #4 of 5 Old 07-06-2011, 03:43 PM Thread Starter
flaneryjunior99
Registered User
1999 XJ Cherokee 
 
Join Date: Jun 2011
Location: Elkhorn City
Posts: 3
the 99 only has one oxygen sensor i cut the catalatic converter off no change. replaced the camshaft position sensor no change, I replaced the ingnition coil bar no change.
It is showing p0351 and p0352 ingnition coil A and B circuit malfunction.
I broke into the harness traced the wires to the pcm nothing broken.
Ive had ppl tell me it is the pcm.
What do u all think?
flaneryjunior99 is offline  
post #5 of 5 Old 07-09-2011, 05:29 PM Thread Starter
flaneryjunior99
Registered User
1999 XJ Cherokee 
 
Join Date: Jun 2011
Location: Elkhorn City
Posts: 3
i put a pcm in it no change..
flaneryjunior99 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
Runs great cold, but idles crappy if it goes a hair above 210. keepishop XJ Cherokee Technical Forum 4 01-08-2011 04:35 PM
New member can use a little help. XJ runs warm? mula XJ Cherokee Technical Forum 19 12-12-2010 07:27 AM
Runs great, then dies ssebastian XJ Cherokee Technical Forum 1 09-07-2008 10:12 PM
Runs rough when warm, help Hendo_10 XJ Cherokee Technical Forum 4 01-03-2006 02:50 PM
Runs choppy at warm startup drwambo XJ Cherokee Technical Forum 3 06-03-2005 04:43 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