Skip the auto shop - Our mechanics make house calls

Q: Catalytic converter gets red and lost power

asked by on

My catalytic converter gets cherry red after 5 minutes of running the car, also I lost power and the engine shakes, the cat was clogged so I replaced,also replace spark plugs and ignition coils but car still do the same thing

My car has 17000 miles.
My car has a manual transmission.

There’s only one thing that will cause a converter to glow red. That is too much air and fuel. The most common reason is the engine is misfiring. If your engine is shaking, and does not have power, it is misfiring. The catalytic converter is not at fault.

When you replaced your spark plugs and coils, you also should have replace the ignition coil housing. It is known to mechanics as the "battleship". Spark produced by the coils has to travel along metal tabs to reach the plugs. It is common for this part to fail, and when it fails the spark jumps to other cylinders causing the engine to run very poorly. Replace this housing.

If the engine still runs poorly, more diagnostics will be needed. Do not continue to run the engine before it is repaired. If you do, you may have to replace the converter again. If you need help having this checked, a certified professional from YourMechanic can come to your car’s location to diagnose the loss of power in person and pinpoint what repairs are necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Difficulty starting especially on cold engine

Thanks for writing in about your 1984 Ford F-150 If the vehicle is easier to start when "rocking" the vehicle back and forth, it may be an issue with the fuel pick up inside the gas tank. If for example,...

Q: I smell gas when driving my car.

Having gas fumes in your car is a serious problem that needs to be addressed right away. Gas fumes are toxic and dangerous to inhale. A certified mechanic will be able to identify if gas fumes are what is being...

Q: Car loses power, cannot start. 2002 Mercedes-Benz CL500

Hello there, misfires are a common fault on cars as they get older such as the 2002 Mercedes CL500. Many different faults can cause the misfires such as the spark plugs, coil packs, fuel injectors, fuel pump, MAF sensor, oxygen...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...