Why is my catalytic converter glowing


Asked by Apr 24, 2015 at 06:52 AM about the 2003 Ford F-150 XLT Extended Cab 4WD SB

Question type: Maintenance & Repair

previous blew out spark plug out of

9 Answers


Catalytic clogged

1 out of 1 people think this is helpful.
Tom Demyan

Glowing cat is from a rich condition. So excess fuel is being burned int the cats vs the engine. Check for a misfire, or leaky fuel injector. How is the truck running? CEL on?

Tom Demyan

Unfortunately if you let this condition persist, then yes the cataltic convertor might be ready to replace. But fix the reason of the truck is running rich first, becuase you will be replacing the new cat in short order.


Intermittent misfire on 3 what is CEL


Both sides were hot I could understand if one side was hot and the other normal so it puzzled me

1 out of 1 people think this is helpful.

Check engine light is not on did put a new coil pack on when changed was on previously

Tom Demyan

CEL is Check engine light, fix the misfire condition, by changing the plugs, and or coil.

Andrew Olsen

If your plug comes out of the head then raw fuel has the potential to contaminate the cat as it won't be firing and burning fuel. Ahh the ford triton motor

Kelly Mayo

This is an example of a converter meltdown. The converter was super- heated due to a raw fuel condition in the exhaust flow. The excess unburned fuel ignited when it struck the hot ceramic catalyst and drove the temperature far above the normal operating condition of the converter. The ceramic catalyst is unable to withstand the extremely high temperature and begins to melt. The ceramic collapses and the converter is destroyed. The melted ceramic may block the exhaust flow and cause additional damage to the engine. A converter glowing red-hot, or evidence of heat discoloration, confirms this situation. The condition that led to this converter meltdown could be the result of a number of malfunctions including faulty oxygen sensor, an incorrect fuel mixture, worn spark plugs or plug wires, a faulty check valve, incorrect ignition timing, sticking float, faulty fuel injectors or other ignition malfunctions.

5 out of 5 people think this is helpful.

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