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Yes, as the cat is possibly getting blocked back pressure will occur in the engine. This will cause the car to use a lot more fuel. Cats can be tested very easily with a back pressure tester, any good workshop should have one of those

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Q: Can a defective catalytic converter affect gas mileage for a lancer?
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Will catalytic converter affect battery power?

No.


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.


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If your catalytic converter has a crack can it affect the idol?

I dont believe it will if the converter is cracked but if the converter is plugged it definetly will.


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Underinflated tires, carrying too much weight in vehicle, excessive speed, engine that needs a tuneup, brakes dragging, or partially clogged catalytic converter.


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No, it has no effect on the A/C.


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not really, as long as it is at the right temperature, it will not be affected


Does a catalytic converter affect the performance or driveablity of a car?

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the answer is no . the converter would not affect just one cylinder .


If the catalytic converter was removed from a 2000 jetta will if affect the performance or computer?

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Can the catalytic converter be remove and not replace to a 1998 Ford Explorer SOHC will it affect in a mechanical way?

Its for Mexico OFF ROAD. not for driven in USA.