JT4x4

The Mud Pit => Wrenching => Topic started by: CnoteTJ on February 28, 2008, 02:02:18 PM

Title: 01 XJ 4.0L auto check engine light
Post by: CnoteTJ on February 28, 2008, 02:02:18 PM

My buddy started up his XJ this morning and immediately got the check engine light.  After allowing it to warm up for 5 minutes he came back and it was already starting to overheat!  Anyone have any experience with this, also, anyone have a code reader so we dont have to limp-it to advance auto!  Preesh the help homies.

Title: Re: 01 XJ 4.0L auto check engine light
Post by: mallcrawl on February 28, 2008, 02:04:01 PM

my bet would be the electric fans not spinning, not sure why it would have triggered the check engine light instantly though.

Title: Re: 01 XJ 4.0L auto check engine light
Post by: Axle on February 28, 2008, 02:09:25 PM

Could be a bad thermostat.

Title: Re: 01 XJ 4.0L auto check engine light
Post by: CnoteTJ on February 28, 2008, 02:22:16 PM

i was thinking thermostat, i just want to get more opinions if thats not it and the check engine light is throwing me off

Title: Re: 01 XJ 4.0L auto check engine light
Post by: reg on February 28, 2008, 02:36:12 PM

not to be too obvious, but to my knowledge XJ's have mechnical fans (at least mine did 2000)  I had similiar problems.  how hot did it get.  fluid level good?  try pulling the thermo and running it.  does it still overheat?  I upgraded to this: CSF heavy duty 3-row for $165.
 (http://www.radiatorbarn.com/s7.asp?ac=Y&year=2000&make=JEEP&model=CHEROKEE&submodel=XJ&engine_size=L6%2C4.0L%2C242ci)

I loved it, never had problems again.  Mine would overheat anytime there wasn't air moving over the radiator. I tried everything, but finally it came down to the radiator.  EASY INSTALL.

Title: Re: 01 XJ 4.0L auto check engine light
Post by: HOT-ROD on February 28, 2008, 03:30:58 PM

i would check the oil alos with the cold. if its too thick, not lubricating properly, if there is any. friction =heat.

how deo sthe engine sound when running? and ticking, or stuttering?

other than that i echo what reg posted.

Title: Re: 01 XJ 4.0L auto check engine light
Post by: Rebell Bull on February 29, 2008, 08:59:04 AM

have an OBD11 at shop. The thermostat is probably stuck shut, but I do recommend a heavy duty radiator.

Title: Re: 01 XJ 4.0L auto check engine light
Post by: CnoteTJ on February 29, 2008, 04:43:35 PM

ended up being the thermostat was toast, so he upgraded to a 180 since it was a 195.  thanks for all the extra ideas guys

Title: Re: 01 XJ 4.0L auto check engine light
Post by: HOT-ROD on March 04, 2008, 11:26:06 PM

glad it got figured out.