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Unburned fuel passing through it superheating the catylist. Either because of poor mixture or misfire usually. Check your backpressure-this condition can clog them up in almost no time. Use a vac guage and monitor at idle if it goes down while truck is running, backpressure is slowing down engine.

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Q: What causes a catalytie converter to turn red in a 1997ford f150 pickup?
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