Skip the auto shop - Our mechanics make house calls

Q: Knocking sound when driving. Disasters when braking or accelerating.

asked by on

When I drive I hear a knocking sound that gets more frequent the faster I go. The knocking only appears when I cruise, if I'm braking or accelerating the sound disappears. Been under the car today and I've noticed my heat shield is slightly loose and close to my exhaust. Could it be hitting the exausht as I drive??

My car has 60000 miles.
My car has a manual transmission.

If the knocking only appears when you are at cruise and becomes more frequent as you go faster, then you may have an axle inner joint or a transmission mount or engine mount issue. This may be why the noise goes away when decelerating or braking. See if the noise comes and goes if you cruise and let off gas and get back into the gas to see if noise comes and goes. If it does, then try and see with a passenger’s help to see if you can isolate where the noise is coming from. For example, is it the left or right side? This will help to explain the noise to the mechanic when they come and pinpoint the cause of the noise.

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
  • Home
  • Questions
  • Knocking sound when driving. Disasters when braking or accelerating.

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: I have an Altima that stopped accelerating. Battery light and brake light on?

If you have a battery light on then it is most likely the alternator not charging the battery. The brake light may be on since the ABS will not work if the battery voltage drops below 12 volts. You should...

Q: Car won't shift from Park to Drive - it only shifts to third gear

The problem you have described with your vehicle not shifting from park to drive could be a problem with the shifter mechanism. It could be a worn shift cable and/or bushings. I recommend having your vehicle's not shifting from park...

Q: Why does my car shake when I proceed to stop?

It sounds like you have an idle speed problem. It could be a misfire that is only evident when your motor comes to an idle. This could be due to the need for a tune up or an injector problem....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...