What Is The Rattling Noise When I Start My Car?

Why does my car sound like an airplane?

Most wheel bearings manufactured today are sealed bearings.

When the seal is broken or damaged, the wheel bearing will fail and start making noise.

Many describe this as an airplane noise, but others might say it is like driving over a rumble strip on the side of the highway or the whirring of a helicopter propeller..

What are the signs of a bad catalytic converter?

Among the symptoms of a bad catalytic converter are:Sluggish engine performance.Reduced acceleration.Dark exhaust smoke.The smell of sulfur or rotten eggs from the exhaust.Excessive heat under the vehicle.

Is it safe to drive with a rattling exhaust?

If the cause of a loud muffler is not a defect, it is just loud, it may not be as dangerous to drive, but you may get pulled over because of the noise. … It is possible that a broken piece of the muffler may have come off and is rattling in the exhaust system, which can cause the clunking sound.

How much does it cost to fix a rattling exhaust?

If you can hear a kind of rattling sound as you drive along, this usually means that a bracket holding part of the exhaust system in place has become loose and is no longer holding things in place properly. When caught early, this issue is pretty straight-forward and inexpensive to amend – around $40.

Will my car make noise if it needs oil?

When there’s not enough oil, moving parts within the engine do not get the lubrication they need. This allows them to make physical, metal-to-metal contact, which can cause a light tapping or knocking sound. … If you hear engine noise, it’s crucial to check your oil level and conditioned, and have it changed immediately.

Why is my car making a rattling noise when I turn it on?

The rattling noise means that something isn’t right with the way your wheels are attached to the car. For example, a lug nut may have come loose and started rattling as the wheel turned around. Have your tires and wheels checked as soon as possible.

What does it mean when your car starts making noise?

Sounds from underneath your car A rattling sound might mean it’s out of alignment. A hissing sound could mean there’s a crack in the exhaust system. … If your car makes a humming noise, it could mean the differential needs lubricant, the transmission is failing or the universal joints or wheel bearings are wearing out.

Can low oil cause rattling?

Reason, Low Engine Oil Level: If the oil level gets too low, you can have a situation, where the oil pump sucks air into it; and the air gets pumped through the engine along with whatever oil is remaining. As a result, This can cause a rattling or ticking noise from within the engine.

What are signs of a clogged catalytic converter?

Here are some common signs of a clogged catalytic converter:Illuminated malfunction indicator lamp. … Difficulty starting the engine and stalling. … Poor fuel economy and engine performance. … Failed emission test. … Testing for Backpressure. … Other Ways to Check Back Pressure.

What is the most likely cause of a rattling sound coming from the underside of a vehicle?

If you hear a rattling noise coming from underneath your car, this is usually a problem with the suspension or the exhaust system. In order to figure out the root cause of the issue, you need to do some digging. … Most drivers have experienced a curious and concerning noise coming from their car.

What does a bad catalytic converter sound like?

Rattling noise Rattling noises are another symptom of a bad or failing catalytic converter. If a catalytic converter becomes old or damaged internally from excessively rich fuel mixtures, the catalyst coated honeycomb meshes on the inside of the converter can collapse or break apart, causing a rattle.

How does a car sound without a catalytic converter?

Listen to the exhaust. The catalytic converter helps reduce the sound in a car, just like the muffler. A car without a catalytic converter will have a loud exhaust note. … If the bulge is not there, you do not have a catalytic converter.