Skip the auto shop - Our mechanics make house calls

Q: rattling noise when engine idles. load engine noise during acceleration like glass packed muffler

asked by on

start car and sounds like a rattling sound front of car. upon acceleration loud engine noise like you would her with a souped up car with glass packed muffler.

My car has 30000 miles.
My car has an automatic transmission.

A: This may be related to loose exhaust parts ...

This may be related to loose exhaust parts such as exhaust mounting brackets, or potentially a bad or failing catalytic converter. As you may know, the catalytic converter has a honeycomb-like structure inside of it which helps to convert toxic exhaust gases into less harmful pollutants. When this honeycomb-like structure begins to deteriorate, the pieces tend to rattle around inside the converter housing which can cause a rattling sound as you describe. If this is the case, however, you may also notice a check engine light on. A certified YourMechanic technician can be dispatched to your location to help inspect your vehicle’s rattling noises and suggest any necessary repairs.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car is not starting

Hi. In a no start situation, there are always a few items that would need to be looked at. The first thing that is generally done is to read out any trouble codes in the engine computer. If codes are...

Q: Oil leak upon starting cold engine.

You should have the oil filter removed to see if it was double gasket-ed when the oil change was done. This means the old filter gasket did not come off and when new filter was put on it did not...

Q: Rattling Sound - 2007 Subaru Impreza

Hey there. I suspect you have an engine-mounted bracket that is touching a heat-shield or other metal component under the hood, generating the noise you hear. Get a helper to hold the brake, and put the car in gear while...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...