Smashed muffler = bad gas mileage?
#1
Member
Thread Starter
Join Date: Jan 2009
Location: Fort Collins, CO
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Smashed muffler = bad gas mileage?
Hey Everybody-
I bought my XJ about a month ago now, have been getting really crappy gas mileage. I had a check engine light indicating I needed to replace the o2 sensor behind the cat, did that, no more check engine light, but still really bad gas mileage. It's a 2000 with 101,000 miles on it, super good condition, it runs a lot better than my 98 Grand Cherokee with the same engine, but I get around 20mpg in the grand, and I'm only getting 13-14 in the XJ. My muffler has definitely been on some rocks, the whole thing is kinda caved in probably to 2/3 of it's original thickness. Could this possibly be causing the bad mileage? It makes a kindof odd tone too, but again, the thing runs GREAT, so I'm not sure where to start! Thanks!
-00XJCO
I bought my XJ about a month ago now, have been getting really crappy gas mileage. I had a check engine light indicating I needed to replace the o2 sensor behind the cat, did that, no more check engine light, but still really bad gas mileage. It's a 2000 with 101,000 miles on it, super good condition, it runs a lot better than my 98 Grand Cherokee with the same engine, but I get around 20mpg in the grand, and I'm only getting 13-14 in the XJ. My muffler has definitely been on some rocks, the whole thing is kinda caved in probably to 2/3 of it's original thickness. Could this possibly be causing the bad mileage? It makes a kindof odd tone too, but again, the thing runs GREAT, so I'm not sure where to start! Thanks!
-00XJCO
#2
CF Veteran
Join Date: Feb 2009
Location: socal
Posts: 7,244
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: 4.0
a bad cat and muffler could mess up your mileage. but the xj's are not known to have the best mileage to begin with. replace you muffler. you could also replace all the other o2 sensors the intake filter run some injector cleaner. this might help but the xj is not as curvy as the grand so the mileage will never be as good.
Last edited by a1racer; 02-15-2009 at 08:51 PM.
#3
CF Veteran
Join Date: Oct 2007
Location: W-PA
Posts: 3,883
Likes: 0
Received 6 Likes
on
4 Posts
Year: 2001
Model: Cherokee
Engine: 4.0
Hey Everybody-
I bought my XJ about a month ago now, have been getting really crappy gas mileage. I had a check engine light indicating I needed to replace the o2 sensor behind the cat, did that, no more check engine light, but still really bad gas mileage. It's a 2000 with 101,000 miles on it, super good condition, it runs a lot better than my 98 Grand Cherokee with the same engine, but I get around 20mpg in the grand, and I'm only getting 13-14 in the XJ. My muffler has definitely been on some rocks, the whole thing is kinda caved in probably to 2/3 of it's original thickness. Could this possibly be causing the bad mileage? It makes a kindof odd tone too, but again, the thing runs GREAT, so I'm not sure where to start! Thanks!
-00XJCO
I bought my XJ about a month ago now, have been getting really crappy gas mileage. I had a check engine light indicating I needed to replace the o2 sensor behind the cat, did that, no more check engine light, but still really bad gas mileage. It's a 2000 with 101,000 miles on it, super good condition, it runs a lot better than my 98 Grand Cherokee with the same engine, but I get around 20mpg in the grand, and I'm only getting 13-14 in the XJ. My muffler has definitely been on some rocks, the whole thing is kinda caved in probably to 2/3 of it's original thickness. Could this possibly be causing the bad mileage? It makes a kindof odd tone too, but again, the thing runs GREAT, so I'm not sure where to start! Thanks!
-00XJCO
#4
Member
Thread Starter
Join Date: Jan 2009
Location: Fort Collins, CO
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: 4.0 I6
a bad cat and muffler could mess up your mileage. but the xj's are not known to have the best mileage to begin with. you could replace all the other o2 sensors the intake filter run some injector cleaner. this might help but the xj is not as curvy as the grand so the mileage will never be as good.
#6
Member
Thread Starter
Join Date: Jan 2009
Location: Fort Collins, CO
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Trending Topics
#8
Member
Thread Starter
Join Date: Jan 2009
Location: Fort Collins, CO
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: 4.0 I6
So what's the reason for my XJ getting much less MPG than my grand? They are both 100% stock at this point and running the exact same size tires?
Thread
Thread Starter
Forum
Replies
Last Post
FS[GreatLakes]: Upgraded 4 Hole 87-98 Injectors
JeepStephie99
Engines/Tranny/T-Case
107
07-12-2016 01:58 PM
Tcq192
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
7
10-23-2015 09:25 AM
cdf43
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
18
09-09-2015 02:47 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)