Skip the auto shop - Our mechanics make house calls

Q: Car making a hard knocking sound

asked by on

The car starts normally, but when I shift into Drive or Reverse, the car starts making a hard knocking sound, and the engine starts moving all over.

It sounds like you have a broken engine or transmission mount, causing your engine to move. You could also have an engine misfire. An inspection of your engine’s knocking sound from a qualified technician, such as one from YourMechanic, can help you determine the cause, and fix your issue.

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: Had blown spark plug on my engine. The spark plug was replaced a few times and the engine is shaking really bad.

Hi there. If the spark plug is constantly burning up, then check the coil and see if it has a proper ground. The coil wire could be producing too much resistance making the coil overheat and send too much current...

Q: The D light on the dashboard keeps blinking after the gear shift from reverse to drive

Hi There, The blinking D light indicates that there is a problem with the transmission. This may be something mechanical such as a shift solenoid or possibly some electrical such as a transmission speed sensor. This may also indicate that...

Q: Front of car sitting on front passenger's side wheel

If the tire is gone, or shredded, you had a blow out and will need to replace the tire. If the suspension is sagging to the point that the fender is rubbing the tire, you have a suspension failure. This...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.