[chilehed]

The max allowable cat temp is 950C (1742F). 1350F is a perfectly normal operating temperature.

 

[chilehed]

Thanks for the information.

Sure thing, but I was thinking about how you specified that the cat was orange and not red. If it was what a heat treater would call orange, that happens at around 1700F which is getting up there.

The fact that there aren't any temperature sensors in the cat means that the cat temp readings coming out of the controller must be modeled signals. It might be possible for something to be wrong that skews the temperature readings low without setting a code; I don't know what that might be offhand - an aftermarket tune probably could I bet. I'm not confident that the folks who develop those go to the trouble of putting thermocouples into the converter bricks to make sure they don't overtemp them.

If I were really worried that my cat was getting to hot I'd try to find someone who has an infrared thermometer to measure its skin temp.

 

[chilehed]

my ignition coil connector got loose

Aaaah, the plot thickens!

....dont you think continuous misfire should happen in order to burn the cat completely and in this case check engine light should come first before cat burn down.

A misfire rate high enough to torch the converter would certainly have caused the light to flash while it was happening; it's more likely that you didn't notice it than that it wasn't flashing. A steady light is set after misfire is detected on two key cycles.

Yes worry point is why it is glowing in night after just one hr highway drive, not sure it is normal behavior or not.

It's normal for a properly operating cat to glow red. They get hot enough to start a fire under the car if you pull over into tall grass.