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A properly working cat, no. Removing it, no. A failed cat, yes.

A properly working cat, no. Removing it, no. A failed cat, yes.

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10y ago
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10y ago

A properly working cat, no. Removing it, no. A failed cat, yes.

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Q: Will a catalyic converter effect gas mileage?
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What makes a catalyic converter go bad in a Kia Sephia?

the same as any cat, you usually plug them up with cheep gas and fuel additives.


What causes horrible mileage in a 2.5 liter 1997 Jeep Wrangler?

A bad catalyic converter will do a lot to diminish your gas milage. You might also have issues related to a "tune up" that include timing, a dirty air filter, dirty/worn spark plugs and other things.


Will a bad catalytic converter cause decreased gas mileage?

It could, yes.


Does a loud exhaust effect gas mileage?

no


Does the idler pulley effect gas mileage?

No


Will custom wheels effect gas mileage?

No, I don't think they would negatively effect your gas milage. You just need to make sure that you keep them with plenty of air. That is what would negatively effect your gas mileage.


Can studded tires effect on gas mileage?

yes


Does old oxygen sensor effect gas mileage?

If it is malfunctioning it can affect fuel mileage.


How much do car roof racks decrease gas mileage?

Roof racks themselves have a negligible effect on gas mileage.


Do the o2 sensors effect gas mileage?

Yes.Yes.


Does a new serpentine belt improve gas mileage?

Should have no effect


Can a new catalytic converter cause poor gas mileage?

No, there are many other parts on the engine that can affect mileage but the catalytic converter is a passive device and, if new and clean, cannot affect the way the engine runs or the mileage it gets. Think of it as a filter, althought it's actually a lot more complex than that, if it lets the exhaust gases flow throught without any major obstruction then it can have no effect on the car's performance.