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.

A: It sounds like you have a broken engine or ...

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: Metal noise when turning left.

The noise over bumps could be related to the steering rack or mounts. You have already replaced everything else. As for the screeching noise, there is a chance that the brake dust shield is rubbing the rotor The shields...

Q: Car revs high and jerks when first starting to drive car, while driving.

Hi There, It sounds like you may have low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates...

Q: strange problem

Hello. The symptoms you are experiencing can be caused by a wide variety of issues. If the symptoms appear to come and go then it may be possible that the symptoms are electrical in nature. A few things I would...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...