Skip the auto shop - Our mechanics make house calls

Q: Loud roaring sound from engine when accelerating

asked by on

I can hear a loud roaring sound coming from the engine as the car accelerates. The Check Engine light also comes on. when I had it checked, I got error codes dealing with an air leak.

A: It sounds like you have an exhaust leak. An...

It sounds like you have an exhaust leak. An exhaust leak can cause a Check Engine Light. It will give the O2 sensors a false reading. The exhaust runs nearly the length of the car and consists of two catalytic converters, three mufflers and piping. It can leak anywhere and usually leaks due to rust. Only the broken section needs replacing, but it will need to be inspected to see what needs replaced, and what parts can still be used. Replacement exhaust is a lower quality than factory. Factory exhaust is very expensive when it is available. The Check Engine Light should go out if the exhaust leak was the cause, so don’t pay extra to have it diagnosed. If it remains on after a week, then have it diagnosed.

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: Knocking/Rattling sound in the engine bay on startup.

It would be difficult to tell what is causing the noise without first inspecting the vehicle using a mechanic's stethoscope on various locations to determine exactly where the source of the sound is. However, it is possible that the noise...

Q: Engine stalls after a few minutes.

It is normal operation for the Check Engine Light to turn on when the key is in the engine run position and the engine is not running. As soon as the engine is started it should go out within 2-3...

Q: the shop costed me 378 dollars to replace camshaft sensor for 2004 chrysler 300M. am i being ripped off?

The camshaft position sensor itself, for your application, costs at most $30 if you buy it using the usual 30% off coupon(s) at the national auto parts chains. Even if you pay full fare, that is buy the genuine OEM...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...