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  #13  
Old 05-12-2013, 04:41 PM
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Re: Very low milage??

Dmsfun is correct. Again, you'll need to have some way of of checking O2 Sensor voltages (if the rears mirror the fronts in movement, the cats may be (probably) bad), or you'll have to take it to a REPUTABLE muffler shop and have them checked. I say reputable, as many will just try to sell you them outright.....good profit margin for them.
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Old 05-12-2013, 07:04 PM
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Re: Very low milage??

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Originally Posted by roryh86 View Post
Wow thanks for the good news haha. How would I check/know if I have bad catalytic converters?
do you smell sulfur while you're driving? that's one telltale sign of a bad catalytic converter.
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Old 05-12-2013, 07:15 PM
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Quote:
Originally Posted by rejekted rekoning View Post

do you smell sulfur while you're driving? that's one telltale sign of a bad catalytic converter.
Not sure what sulfur smells like, but at times I've gotten a whiff of fuel smell when I turn on car, while it's still warming up and if I have windows open. It's just for a moment not constantly.
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Old 05-12-2013, 08:47 PM
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Re: Very low milage??

Smells like rotten eggs. In many cases it can mean a bad converter, but if there are problems with the vehicle tune, especially fuel injection related, can cause this too. Basically, IIRC, there is sulphur in our fuels (sometimes differing amounts in different states/gas stations), and it sometimes means the fuel is not being completely burned during combustion and is being "stored" in the catalytic converter and when the cat. tries to burn it off it releases sulpur dioxide. I'd try a couple different types/brands of fuel and make sure the vehicle is properly tuned (and not getting lousy fuel economy) first. If all this is verified good and it continues, yes, it could be a bad converter. If you're getting a fuel smell, even for a short time, you need to have the vehicle checked for leaks or an evaporative system problem.
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Old 05-13-2013, 01:41 PM
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Re: Very low milage??

Quote:
Originally Posted by jeepgcoman View Post
Smells like rotten eggs. In many cases it can mean a bad converter, but if there are problems with the vehicle tune, especially fuel injection related, can cause this too. Basically, IIRC, there is sulphur in our fuels (sometimes differing amounts in different states/gas stations), and it sometimes means the fuel is not being completely burned during combustion and is being "stored" in the catalytic converter and when the cat. tries to burn it off it releases sulpur dioxide. I'd try a couple different types/brands of fuel and make sure the vehicle is properly tuned (and not getting lousy fuel economy) first. If all this is verified good and it continues, yes, it could be a bad converter. If you're getting a fuel smell, even for a short time, you need to have the vehicle checked for leaks or an evaporative system problem.
I can confirm that there is no/has never been any smell of sulfur, so I guess that's good. I have ordered the parts (4xNTK 23159 O2 sensors, 2 part PCV valve '07 model, and an AIRTEX MAP sensor) and waiting for their arrival from the states

I was looking at MagnaFlow catalytic converters that fit my model and I wouldn't mind replacing mine anyways in the near future. Any idea if a Non-CARB cat can provide increased MPG and possibly more power vs a CARB compliant cat (emissions are not a problem in my area)? What's the better way to go if there's no need to pass any emission tests?

As for the leaks, I'm planning to have a full check up at JEEP soon which I'll have them take a look. Thanks again everyone for all the help.
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Old 05-16-2013, 04:58 AM
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