Catalytic Converters
Oxygen Sensors
Honda Accord LX

Why will catalytic converter turn red when car is running new Transmission was just installed?

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2011-09-13 17:05:51
2011-09-13 17:05:51

When traveling home at night from a weekend camping trip, my wife noticed something glowing under the truck. It turned out to be my catalytic converter. My truck had been running poorly and I barely made it home. It turned out that one of my spark plug wires was bad (burned on the exhaust manifold) and was not firing properly. This caused unburned fuel mixture that was not burned in the cylinder to enter the converter where it would ignite and create the high temperatures, causing the converter to glow bright orange. I would say unburned fuel mixture entering your converter is causing the converter to overheat. A bad spark plug wire is only one of several causes of unburned gas. Others could be failing spark plug, stuck carburetor float, etc. Hope this helps.

Magdude1

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It is possible but highly unlikely as a catalytic converter should NEVER go bad unless something causes it. If you have a check engine light "ON" then I would have someone with the knowledge and equipment to diagnosis it for you. It will save you alot of money. Either a very rich or lean condition will cause a converter to glow red and seem stopped up.jd1709

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Bank 1 is the upper oxygen sensor(s) before the catalyst (catalytic converter) bank 2 is the oxygen sensor after the catalyst (catalytic converter)

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It should last the life of the car if you maintain the car as you should. Let the engine start running rich and do nothing to repair this condition and it will destroy the converter. But keep the engine tuned up and running as it should and you will never have to replace the converter. NEVER had a problem with my 1996 HONDA ACCORD engine and CATALYTIC CONVERTER needed to be replaced at 220,000 MILES.

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To keep the car running - not at all. To minimize the amount of polluting exhaust - very.

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yes it can you can usually tell if your converter is bad by two ways if your car is running and the converter gets red hot or if the car is cool and you hit the converter and here stuff raddle inside

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The catalytic converter usually has an Oxygen Sensor before and after the converter. The hot exhaust gases of the exhaust heat up a catalystic and the voltage is proportional to Oxygen. By measuring before and after the catalytic converter, you have a sense if the Catalytic converter is working correctly in cleaning up the exhaust. The exhast to be cleaned up correctly requires the PCM to sometimes run Lean fuel mixture, to clean up NOx, and sometimes Rich mixture to clean up HC (Hydrocarbons). So PCM cycles the fuel mixture between rich and lean many times in the process of driving, so that to get optimal efficiency of the catalytic converter. However, if you have a vacuum leak, your engine will run LEAN and the PCM will compensate and force it to run rich instead. After a while, by running rich too much, you are throwing unburned fuel into the exhaust pipe, causing Catalytic converter to become Red hot and causing it to fail. So in short, running Rich, not lean, can cause converter failure.


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