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truckeejeeper
July 2nd, 2003, 09:59
Hey out there. Just found this site and love it. Got some basic qusetions here... first, what is an XJ exactly? I havent been able to find any model breakdowns anywhere, even on the net. I'm driving a '91 4.0L sport- is an XJ a reference to body size?
I love the truck and have been fixing up since I got it 2 years ago. I've read alot about the engine temp issues, and want to work on that. My mileage is bad and it runs really, really hot. I know they run hot, but mine is HOT. For simple mod's, what K & N filter is everyone talking about? When I go in to buy it, which is it and does it fit right in where the old one is? Also, does my Jeep have cat that may need replacing? Finally, if I put too much coolant solution in the plastic well, it soon bubbles out and overflows near the radiator until it is back down to marked level. Is this normal?
I've already replaced the water pump, muffler, radiator, o2 sensor, CPS sensor, Speedo, AIS motor, plugs, cap, wires, etc.
01xj
July 2nd, 2003, 10:34
No expert here - but here's a bunch of stuff to look at:

- is all of the air "burped" out of the coolant system
- is the fan clutch slipping
- is the thermostat working properly or is the housing gunked up
- is the aux fan (or sensor) working properly
- is the fan belt tight
- is the radiator or grill blocked

mostly common sense stuff - good luck!
Eagle
July 2nd, 2003, 11:17
'XJ' was Jeeps model code designation for the mid-size Cherokee (1984 thru 2001). They used other similar codes for other models, such as the ZJ for the Grand Cherokee (1993 thru 1998), WJ for the Grand Cherokee 1999-pres, and so on for other Jeep models.
BrettM
July 2nd, 2003, 13:42
Originally posted by Eagle
'XJ' was Jeeps model code designation for the mid-size Cherokee (1984 thru 2001). They used other similar codes for other models, such as the ZJ for the Grand Cherokee (1993 thru 1998), WJ for the Grand Cherokee 1999-pres, and so on for other Jeep models.

Exactly, also YJ for 87-95 Wrangler (leaf sprung), TJ for 97-present Wrangler (coil sprung), KJ for Libertys, MJ for Comanches, then of course there's all the CJs... we won't go there;)

Check the Tech section from the main page for some simple engine mods. And search around on the forums here, there is an abundance of information about XJs/MJs here.
LRRH
July 2nd, 2003, 14:01
you guys for got the SJs....full size jeeps =)
mengleff
July 2nd, 2003, 14:37
although there seems to be a stigma attached to this site as a result of some dummy's... there is a thread here that has some good basic info and FAQ's about XJ's for us XJ noobs...
http://www.jeepsunlimited.com/forums/showthread.php?s=&threadid=272033
01xj
July 2nd, 2003, 15:51
Originally posted by mengleff
although there seems to be a stigma attached to this site as a result of some dummy's... there is a thread here that has some good basic info and FAQ's about XJ's for us XJ noobs...
http://www.jeepsunlimited.com/forums/showthread.php?s=&threadid=272033


stewed prunes - they should help you out there pal.....
Centrevillemx
July 2nd, 2003, 17:03
But don't you have to be a NAXJA Member to view the tech section? I'm a freeloader but not for long....
GSequoia
July 2nd, 2003, 17:10
Depends on what you want to look at Centre. There's two tiers of the Tech Stuff, stuff just for members, and stuff for everybody (consider it a preview of our Tech Section :))

NAXJA Tech Articles (http://www.naxja.org/techArticles.html)

Sequoia