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The engine computer will try to adjust fuel and timing to make the after cat O2 sensor read properly. With no cat that will be impossible. This will cause the fuel mixture to swing wildly from rich to lean until the point that the computer sets a code. It will then run in a default fuel/timing setting that will be at a reduced power level with lower fuel economy.

The engine computer will try to adjust fuel and timing to make the after cat O2 sensor read properly. With no cat that will be impossible. This will cause the fuel mixture to swing wildly from rich to lean until the point that the computer sets a code. It will then run in a default fuel/timing setting that will be at a reduced power level with lower fuel economy.

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12y ago

The engine computer will try to adjust fuel and timing to make the after cat O2 sensor read properly. With no cat that will be impossible. This will cause the fuel mixture to swing wildly from rich to lean until the point that the computer sets a code. It will then run in a default fuel/timing setting that will be at a reduced power level with lower fuel economy.

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Q: How will taking off a catalytic converter make a 2000 gmc sierra affect the way it runs?
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