I wasn't really referring to damaging the cat.. the heatshield on the cat is only meant to be effective in it's normal operating range... and it's normally in pretty close proximity to the body... heat shield fails, it heats up the body, and 1600* translates to cabin fire.
How do I know this? I had to replace the carpet in 2 cars because I didn't think running too rich for any period of time would cause a problem. Then I found out that excess fuel causes the cat to heat up more than it should, and it kinda dawned on me at that point.
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Originally Posted by 2carpros.com
Question: 2004 Nissan Sentra 1.8_mileage: 41,000. I just bought a low mileage Nissan Sentra. The fuel economy is terrible, not what I would expect from a V6. It sometimes hesitates to start. It warms up very fast but the interior gets unusually warm as though the catalytic converter is working overtime. The excess heat comes up through the floor. What is the likely cause and solution to this problem?
Answer: Scan computer for fault codes. You will probably find one indicating that your engine is running too rich which causes the catalytic converter to overheat. Check the fuel pressure regulator and check for faulty fuel injectors.
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And more information:
Catalytic Converter
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