all muffler and exhaust questions go here!!!!!!
03-15-2013, 09:15 AM
#2791
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Location: Kansas
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Year: 1994
Model: Cherokee
Engine: 190-hp, 4.0-liter I-6
If I throw a new catalytic converter on, can that help my mileage. Mine was "stolen" a long time ago so I don't persay have one but gonna get one, will it help my bad mpg? Ive heard mixed things on them.
03-15-2013, 09:20 AM
#2792
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Location: San Jose
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Year: 89
Model: Cherokee
Engine: 4.0 I6
If you have an o2 sensor downstream of it it should, otherwise probably not by much if at all. Put a cat on it man, you're killing my environment.
03-15-2013, 12:13 PM
#2794
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Location: Fort Wayne, Indiana
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Year: 1997
Model: Cherokee
Engine: 4.0L
I heaven't read through all 187 pages, but has anyone used a Spark Plug non-fouler to trick the ECU into thinking there is a cat(when there isn't) in order not to throw CEL's?
I was a trick we used with the SRT-4's on Cattless Downpipes, used a 18mm Spark Plug Non-Fouler
I was a trick we used with the SRT-4's on Cattless Downpipes, used a 18mm Spark Plug Non-Fouler
03-16-2013, 05:46 AM
#2795
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Year: 1999
Model: Cherokee
Engine: 4.0 i6
hey my jeep is acting a little funny. somedays itll have a ton of power, acclerate quikckly, and not need much pressure on the gas pedal, all i do is rest my foot on the gas pedal and it continues to accelerate. but other days i have to press the pedal almost halfway down to get it to accelerate at the same rate, probably 1/3 just to maintain speed. could this be a problem with the o2 sensor? maybe making the mixture too rich or too lean? if not ill ask in other threads.
03-16-2013, 07:51 AM
#2796
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Location: S.Jersey
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Year: 1999
Model: Cherokee
Engine: 4.0
hey my jeep is acting a little funny. somedays itll have a ton of power, acclerate quikckly, and not need much pressure on the gas pedal, all i do is rest my foot on the gas pedal and it continues to accelerate. but other days i have to press the pedal almost halfway down to get it to accelerate at the same rate, probably 1/3 just to maintain speed. could this be a problem with the o2 sensor? maybe making the mixture too rich or too lean? if not ill ask in other threads.
if there is no cel, i would hook a scanner to it anyway. incase the light is burnt out. or the light blipped when you weren't watching it. it will still store the code either way.
03-16-2013, 10:00 AM
#2797
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Join Date: Sep 2009
Location: vail co
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Year: 98
Model: Cherokee
Engine: 4.0 l6
Stop the debate. Just chop after cat make/buy 30degree turn down weld on or clamp...sounds nasty can set off sensitive car alarms
03-17-2013, 10:14 AM
#2798
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Location: Freeport, IL
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Year: 1997
Model: Cherokee
Engine: 4.0L
Just a question, I cut my muffler off yesterday because the inside of it is starting to come loose and rattle at low Rpms. The cat is still on but my question is, is it bad for the cat if I'm not running a muffler?
03-17-2013, 11:21 AM
#2799
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Year: 1990
Model: Cherokee (XJ)
Engine: Renix 4.0
Originally Posted by 99 Cherokee Limited
Just a question, I cut my muffler off yesterday because the inside of it is starting to come loose and rattle at low Rpms. The cat is still on but my question is, is it bad for the cat if I'm not running a muffler?
03-18-2013, 03:53 AM
#2800
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Year: 1999
Model: Cherokee
Engine: 4.0
03-18-2013, 10:32 AM
#2804
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Year: 1990
Model: Cherokee (XJ)
Engine: Renix 4.0
Originally Posted by Lw2044
Thanks, do you know they're sturdy from personal experience?
03-18-2013, 01:13 PM
#2805
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Year: 1997
Model: Grand Cherokee
Engine: 4.O L Straight 6
You mean you wanna take your whole exhaust off including the tubing? And just adding a bigger set of tubing? IMO if your gonna straight pipe it just cut off the "stuff" no point in all that time and money to make your jeep illegal. Plus guys will tell you it's bad for your motor. If that's true or not idk, I'm not a mechanic but I drove mine like that for awhile and it's fine. It sounds cool at first but gets annoying through at least a decent muffler on.