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The main symptom is a complete lack of power. By lack of power i mean holding the gas pedal to the floor and only going 15 miles per hour. The car will idle well but no power hardly at all.
Another symptom is rattling. If you strike the bottom of the Catalytic Converter wil a rubber hammer you will hear rattling from inside the converter. That indicates that the honeycomb matrix inside the coverter has broken apart.
Finally, if you ignore the loss of power (it gets progressivly worse) eventually the car will not even start.
Please keep in mind that the converter does not instantly go from good to plugged. It takes time. Mostly you notice the power loss on top speed first.For example only being able to go 50 m.p.h. . Then later on only 40...Again, the power loss gradually gets worse.
If you really think the converter is plugged then you can disconnect the exhaust in front of the converter and see if the power returns.
Also please keep in mind that some cars have "pre-cats" or "mini-oxidation" converters. Thay are a small catalytic Converter in front of the main converter. They go bad as well.
Matter of fact, the last car i had with a bad "cat" it was one of those pre-cats. It was on a Toyota.
One last thing...Mercedes Benz has a recall on the Converters on some models. You can get it replaced fo free. (normally $800) About a year ago i had a Mercedes come in with a top speed of 5 MPH. I removed the cat and the guts of the converter poured out like coffee grounds. Free replacement from the dealer
Some cars have up to 4 cats so keep that in mind also.
best of luck
^_^
What else can I help you with?
Symptoms of bad catalytic converter 94 lumina?
Some symptoms of a bad catalytic converter on a 1994 Lumina are engine stalling, engine backfiring, no start of engine, and poor power pick up. If the catalytic converter has rust holes, the vehicle will also be very loud when running.
What are some symptoms if your catalytic converter goes bad?
Hard starting, loss of power, poor fuel mileage are symptoms of a clogged converter.
How can you pass inspection when you need a catalytic converter?
There's no possible way to pass inspection with a bad catalytic converter, if if you find out you have a bad catalytic converter during your inspection you have a chance after you after you have replaced the catalytic converter and the inspection no no charge/free!!
What are the symptoms of a bad catalytic converter in a Nissan Maxima?
Hard starting, loss of power, poor fuel mileage.
What if you still have the same symptoms after changing your catalyic converter?
Well . . . you know the problem was not caused by a bad catalytic converter. You could experiment with replacing your oxygen sensors, next . . .
What are the symptoms if the catalytic converter stops working?
Vehicle "bogs" and has no power
Can a catalytic converter cause the EGR valve to go bad?
No, the catalytic converter is downstream from the EGR valve so it has no effect on it.
How do you know if a converter is bad on a Kia Rio?
Transmission torque converter or an exhuast catalytic converter?
Can a bad catalytic converter damage the ignition coils or a bad ignition coil can cause to catalytic to go bad on a ford expedition?
A bad coil can damage a converter. If the engine is misfiring, it will cause raw fuel to get into the converter and that can cause failure.
Can a bad catalytic converter cause hard starts?
A bad catalytic converter can cause hard starts if it has become clogged. This produces excessive back pressure in the engine.
What are the symptoms of a bad catalytic converter in a Chrysler Pacifica?
Hard starting, loss of power, poor fuel mileage, a blowing sound under hard acceleration, and the converter will get very, very, hot.
What are the symptoms of a bad catalytic converter on a 1998 Chrysler Sebring?
Check engine light, rattle noise, low power, change in fuel economy,
