How long do 4.0s really last?
No blocks aren't prone to exploding. The late models can possibly have a head from a bad casting. Search for info on 0331 heads. But take it with a grain of salt, mine has 180k and no issues and theres others that have more on theirs.
Junior Member
Joined: Dec 2011
Posts: 39
Likes: 0
From: Greeley, Colorado
Year: 1995
Model: Cherokee
Engine: 4.0L HO I6
95 here w/ 190,000ish, original motor and trans etc... runs like top!!! Lots of hard driving, but well maintained for the most part. With all the other high milage #'s I'm seeing, it sure makes me feel better about my rig! My goal is to make it to 250K.
CF Veteran
Joined: Feb 2011
Posts: 3,074
Likes: 0
From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
dad's 1988 - 301k never rebuilt sold because of rust-
mom's 1990-212k never rebuilt sold because of rust
dad's new 1990 which is now mine after he passed 144k never rebuilt sounds smooth and quiet
the 2 that got sold because of rust are still running around on the road to this day...
maybe it is the Renix powa lol...
mom's 1990-212k never rebuilt sold because of rust
dad's new 1990 which is now mine after he passed 144k never rebuilt sounds smooth and quiet

the 2 that got sold because of rust are still running around on the road to this day...
maybe it is the Renix powa lol...
Originally Posted by The Rooster
dad's 1988 - 301k never rebuilt sold because of rust-
mom's 1990-212k never rebuilt sold because of rust
dad's new 1990 which is now mine after he passed 144k never rebuilt sounds smooth and quiet
the 2 that got sold because of rust are still running around on the road to this day...
maybe it is the Renix powa lol...
mom's 1990-212k never rebuilt sold because of rust
dad's new 1990 which is now mine after he passed 144k never rebuilt sounds smooth and quiet

the 2 that got sold because of rust are still running around on the road to this day...
maybe it is the Renix powa lol...

CF Veteran
Joined: Feb 2011
Posts: 3,074
Likes: 0
From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
Junior Member
Joined: Dec 2011
Posts: 35
Likes: 0
From: KY
Year: 1999
Model: Cherokee
Engine: 4.0 6cyl
my jeep runs great,its a 1999 and has 168,ooo miles I bought it 4 years ago--I let someone do some work on it and now it idles faster than it use to
Does anybody know how fast it should idle in park? Thank you!
Does anybody know how fast it should idle in park? Thank you!
CF Veteran
Joined: Jun 2010
Posts: 1,220
Likes: 5
From: Arkansas
Year: 1987 & 1996
Model: Cherokee
Engine: 4.0
Seasoned Member
Joined: Nov 2010
Posts: 361
Likes: 2
From: Nazareth, PA
Year: 1996
Model: Cherokee
Engine: 4.0L High Output
Originally Posted by Caish
CF Veteran
Joined: Oct 2011
Posts: 1,268
Likes: 1
From: Bakersfield CA
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
WOW


