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Actually there are many ways to tell if you have a bad cat.

.A rotten egg smell coming out of the exaust

.Hesitation and/or bucketing when acceleration takes places

.Increase in engine running temp

.A ratteling in the muffler as car idles

.Car dying sparatically due to engine backpressure

.Difference in temperature from the back of the converter to the front due to clogging

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Q: How can you determine if a catalytic converter is bad?
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Related questions

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!!

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.

Can a muffler get clogged by a bad catalytic converter?

Yes it is possible.

How does a catalytic converter go bad?

They can become clogged or they can burn out.

Does a bad catalytic converter stop car from turning over?


Does it hurt your car to drive with a bad catalytic converter?

Yes it does.

Will bad ignition coils cause the catalytic converter to heat up and go bad?

Yes. If a coil is bad causing one or more cylinders to not fire, this allows raw unburned fuel to enter the catalytic converter, where it is burned. This can ruin a converter.

How do you know catalytic converter is bad?

A bad catalytic converter will cause a severely restricted exhaust system. You would notice a lack of power and performance from you vehicle and in cases of a completely blocked converter, the engine may not run.

Will it hurt to drive with a bad catalytic converter?

Yes, you can do serious damage to the engine if the converter is clogged.