catalytic converter HELP! please

So a few days ago I had a shop weld my magnaflow muffler on I drove around a bit. Then got home looking under my truck to take another look at the welds and I see the 1st cat glowing red close to the back is what it looked like to me. I dont know if it did this before the magnaflw muffler or not. My check engine light is not on and I used a scan tool and eveything thing seemed normal according to the snap on modis.

another question I have has anyone ever check the temp of thier catalytic converter?

thanks for any help or tips

 

clogged

 

The check engine light would be on if it was clogged due to the reduced backpresure.

Catalytic converters have to reach a very high operating temperature to activate the platinum used as the catalyst. It is not uncommon for a truck idling in high grass to start a fire.

Be careful in dry conditions.

 

There is supposed to be a heat sheild on it. If not it was likely removed since it started buzzing. (happened to me in my last 2 vehicles)

 

thanks, it seems to do it most when I get on it for awhile or when the heat or a/c on. anyone ever look at thier 1st cat after a long drive?