New Catalytic Converter Lower MPG
04-11-2011, 11:24 PM
#1
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Model: Cherokee
New Catalytic Converter Lower MPG
2001 Cherokee Sport 4.0L Inline 6
I recently replaced my catalytic converter with a direct OEM cat and have noticed over the past 3 weeks that I'm getting lower MPG. Is this normal or temporary? old cat - avg 215-220 city new cat - avg 185-190
Also, when I looked underneath, I noticed a dent in the exhaust pipe as it snakes from the point after the cat is bolted. Is the dent factory?
I recently replaced my catalytic converter with a direct OEM cat and have noticed over the past 3 weeks that I'm getting lower MPG. Is this normal or temporary? old cat - avg 215-220 city new cat - avg 185-190
Also, when I looked underneath, I noticed a dent in the exhaust pipe as it snakes from the point after the cat is bolted. Is the dent factory?
04-12-2011, 01:20 AM
#2
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Year: 1991
Model: Cherokee
Engine: 4.0 litre
Yep. Lower mileage is standard.
It sucks, but you are saving the world. That's what I still am trying to convince myself of.
It sucks, but you are saving the world. That's what I still am trying to convince myself of.
04-12-2011, 01:21 AM
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Year: 1992
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Engine: 6
Did you disconnect the battery to dump the computer memory?
Pull the battery cable, turn the headlights on for about a minute.
Reconnect battery.
Drive the car easy for the first few miles.
No idea about the dent
Pull the battery cable, turn the headlights on for about a minute.
Reconnect battery.
Drive the car easy for the first few miles.
No idea about the dent
04-12-2011, 06:32 AM
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Year: 1999
Model: Cherokee
Engine: 4.0
The exhaust pipe dent is in there from the factory.
Get at least 3 calculated gas mileage readings before making any assumptions. Do the math. Miles driven divided by gallons consumed. This is the most accurate way of figuring out your mileage.
Get at least 3 calculated gas mileage readings before making any assumptions. Do the math. Miles driven divided by gallons consumed. This is the most accurate way of figuring out your mileage.
Last edited by tjwalker; 04-12-2011 at 07:41 AM.
04-12-2011, 07:29 AM
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Year: 1997
Model: Cherokee
Engine: 4.0L
Need more info. If you're saying that you're getting 190 miles per TANK. You've got WAY more other problems than just the cat.
04-12-2011, 09:22 AM
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04-12-2011, 10:07 AM
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Year: 2000
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Engine: 4.0 I6
Originally Posted by 2Evil4U
Need more info. If you're saying that you're getting 190 miles per TANK. You've got WAY more other problems than just the cat.
Right now I'm averaging 310-340 per tank. As I've never let it run completely dry I'm sure I can squeeze a few more miles out of her. So if you're only getting 220 per tank I think you should start an investigation and see what else its eating your gas mileage before you tackle the new cat.
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04-12-2011, 09:59 PM
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Year: 2000
Model: Cherokee
Engine: 4.0
Originally Posted by askingxforxit
X2!!
Right now I'm averaging 310-340 per tank.
04-13-2011, 12:27 PM
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Year: 2000
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Originally Posted by 2Evil4U
It's not that hard to do. I routinely get 22+mpg out of my stock 97 4.0L 4x4 auto.
Last edited by JCKustoms; 04-13-2011 at 12:48 PM.
04-13-2011, 02:33 PM
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Year: 2000
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Yea I'm stock and getting like 13-14. I've just come to accept it as owning a jeep. I do have a heavy foot though (18 yrs old)
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