90 xj BAD MPG
#1
Seasoned Member
Thread Starter
Join Date: Nov 2011
Location: KNOXVILLE
Posts: 306
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: 4.0
90 xj BAD MPG
ok guys im lost now my xj is getting very ****ty mpg i mean on a half a tank ill go maybe 50 miles what you all think is going on
#2
CF Veteran
Join Date: Mar 2011
Location: California
Posts: 2,570
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1992
Model: Cherokee
Engine: 4.0 HO
Before someone comes and flames the crap out of you, how about some details?
Year, engine, trans, lift size, tires, other mods... What have you tried? When was your last tuneup?
Year, engine, trans, lift size, tires, other mods... What have you tried? When was your last tuneup?
#3
Seasoned Member
Thread Starter
Join Date: Nov 2011
Location: KNOXVILLE
Posts: 306
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: 4.0
yeah prob should have listed all that 4.0 aw4 auto no lift 31 mts has 204k last tune up was around 200k trans was just rebuilt i ordered the accel super tune up kit from quadratec has new vac lines and air filter seafoamed it has full exhaust with high flow cat put on around 180k also ordered rocket air intake
#5
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,864
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Oxygen sensor failure is certainly a possiblity. They're only good for about 80,000 miles.
#6
CF Veteran
Join Date: Nov 2011
Location: phoenix az
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1989
Model: Cherokee
Engine: 4.0l 6 cylinder
Originally Posted by cruiser54
Oxygen sensor failure is certainly a possiblity. They're only good for about 80,000 miles.
#7
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,864
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Trending Topics
#8
CF Veteran
Join Date: Nov 2011
Location: phoenix az
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1989
Model: Cherokee
Engine: 4.0l 6 cylinder
Originally Posted by cruiser54
How many miles have you had your Jeep? They not only fail, they get lazy and unresponsive.
#9
CF Veteran
Join Date: Oct 2011
Location: Seal Beach, CA
Posts: 4,440
Likes: 0
Received 2 Likes
on
1 Post
Year: 1996
Model: Cherokee
Engine: 4.0 HO Straight Six
Originally Posted by stev-o
My Jeep has 180k and I've put about 5k on it how do u know if it has failed
#10
Seasoned Member
Join Date: Mar 2010
Location: steilacoom washington
Posts: 290
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: striaght 6 4.0l
You check and see if you have any bad leaks like your gasket tighten up the valve cover and oil pan check your intake and exhaust manifold bolts see if there is Air getting into your engine . Test by taking brake cleaner and spray different areas and see if idle change at all basically low dollar leak detaction
#11
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,864
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
You check and see if you have any bad leaks like your gasket tighten up the valve cover and oil pan check your intake and exhaust manifold bolts see if there is Air getting into your engine . Test by taking brake cleaner and spray different areas and see if idle change at all basically low dollar leak detaction
#12
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,864
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
#13
Seasoned Member
Thread Starter
Join Date: Nov 2011
Location: KNOXVILLE
Posts: 306
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: 4.0
Yeah I'm going to try that this weekend and it use to not be this bad but its at the point I don't wanna put gas in it Haha
Thread
Thread Starter
Forum
Replies
Last Post
Blue04
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
8
09-12-2015 10:54 AM
ronwu
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
09-08-2015 11:57 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)