2001 XJ Catalytic Converters? 3 Really?
#1
Member
Thread Starter
Join Date: Oct 2010
Location: North Carolina
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: I6
2001 XJ Catalytic Converters? 3 Really?
I plan to test my cats this week with a vacuum gauge attached to one of the upstream o2 ports. I am suspecting that there may be backpressure issue with some or all 3 of the cats on this 2001. Reason is poor gas mileage. Drives fine, plenty of power, but after replacing the spark plugs, cleaning TB, oil change, CAI, new O2 sensors, and misc maintenance, I am only getting 15-16 MPG.
3 Cats, thats 2 too many for a Jeep that isn't in CA. Anyone with a 2001 XJ that has modified the exhaust give me some info?
NOTE: I will run a legal setup with a state/fed required cat. But 3 is overkill.
Will try and rent a gauge from autozone today, or borrow one.
K
3 Cats, thats 2 too many for a Jeep that isn't in CA. Anyone with a 2001 XJ that has modified the exhaust give me some info?
NOTE: I will run a legal setup with a state/fed required cat. But 3 is overkill.
Will try and rent a gauge from autozone today, or borrow one.
K
#2
CF Veteran
Join Date: Jun 2010
Location: Flint/Asheville
Posts: 2,501
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1995
Model: Cherokee
Engine: 4.0 HO
Yea best not to mess with the cats cause it will make the computer do funny things. When you say 15-16mpg is that highway or city? Sounds about right for a modded jeep like yours and it really depends on how you drive. I can get 12mpg or 20mpg just from the way i drive
#3
MJ>XJ
Join Date: Mar 2009
Location: Griffin, G.A.
Posts: 17,836
Likes: 0
Received 4 Likes
on
3 Posts
Year: 1990
Model: Comanche
Engine: 4.0 I6
If your not popping a code for them then there not broke... and there's not 3... there's two... one for 3 cylinders... the other u think list a cat is a resonator... resonators don't hurt anything flow wise... they just take away any crack and pop that may be left before it gets to the muffler...
And XJ's don't get good gas mileage... looks to me like your in the norm... buy a Geo... lol
And XJ's don't get good gas mileage... looks to me like your in the norm... buy a Geo... lol
#4
Member
Thread Starter
Join Date: Oct 2010
Location: North Carolina
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: I6
K
#5
Member
Thread Starter
Join Date: Oct 2010
Location: North Carolina
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: I6
If your not popping a code for them then there not broke... and there's not 3... there's two... one for 3 cylinders... the other u think list a cat is a resonator... resonators don't hurt anything flow wise... they just take away any crack and pop that may be left before it gets to the muffler...
And XJ's don't get good gas mileage... looks to me like your in the norm...
And XJ's don't get good gas mileage... looks to me like your in the norm...
Yes, I understand that my Jeep is in the norm. Still want to do whatever I can to squeeze more out of it. This Jeep is not my Daily driver.
K
#6
☠ CF Sheriff ☠
AFAIK the two pre-cats are to assist with cold-startup emissions before the main cat gets hot enough to function. The readings from the o2 sensors after them are essential to the vehicle operating correctly / not throwing a code. You're not going to be able to "trick" the computer into thinking that they are still there when they are not.
This has been covered a lot. The feds don't care if you live in CA or not, if your vehicle came with the emissions a certain way from the factory, it legally cannot be changed from that configuration.
This has been covered a lot. The feds don't care if you live in CA or not, if your vehicle came with the emissions a certain way from the factory, it legally cannot be changed from that configuration.
Thread
Thread Starter
Forum
Replies
Last Post
The Aristocrat
Wanted
2
02-25-2017 01:17 AM
Raney120
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
22
10-16-2015 11:27 AM
TNXJsleeper
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
1
10-02-2015 08:04 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)