How to tell if catalytic converter is Bad?

How to tell if catalytic converter is Bad?

Among the symptoms of a bad catalytic converter are:

  1. Sluggish engine performance.
  2. Reduced acceleration.
  3. Dark exhaust smoke.
  4. The smell of sulfur or rotten eggs from the exhaust.
  5. Excessive heat under the vehicle.

Why does my Chevy Cobalt make a loud roaring noise?

Turn to the right and a bad left front will make more noise. Another way is to raise the wheel, put the car in neutral with the engine off and spin the wheel by hand while holding onto the spring. You can feel bad bearings grinding inside the race. 5 people found this helpful. wheel bearing usually makes that sound.. hub assembly is worn.

What makes a loud noise at the front of a car?

Loud noise from front end when car reaches 25 mph and gets louder as speed increases. Push in clutch at speed and engine at idle and sound is still there. I think it’s a wheel bearing or cv joint not sure which side.

Why does my Chevy Malibu make a loud humming noise?

It seems to be getting louder. If the wheel has play when it is lifted up it will make narrowing the problem down really easy. It’s when there is no play and the wheel bearing is bad that it is harder to diagnose. Can you tell if the noise is coming from the front or rear?

What to do if your Chevy Cobalt is roaring?

Look at the tires for abnormal wear. If tires look ok, get front end back up in the air. using a stethoscope or other long tool) listen to the hub bearings from side to side. Careful not to hit any moving parts. If you can still not tell which side it is coming from it may be coming from transmission differential bearing or axle bearings.

Why is my Chevy Cobalt making a loud humming sound?

Change both front wheel hub assemblies, if you hear a loud humming sound coming from the front of car. If one side is bad the other side is right behind. Just changed on my daughters car, took a couple of hours to replace, Chevy Cobalts are junk, will never by another chevy cobalt again. Looking to sell and buy a nice used HONDA !

Loud noise from front end when car reaches 25 mph and gets louder as speed increases. Push in clutch at speed and engine at idle and sound is still there. I think it’s a wheel bearing or cv joint not sure which side.

Why is my Chevy Cobalt roaring at me?

If tires look ok, get front end back up in the air. using a stethoscope or other long tool) listen to the hub bearings from side to side. Careful not to hit any moving parts. If you can still not tell which side it is coming from it may be coming from transmission differential bearing or axle bearings.