Q: Bad sounding engine noise, something is loose

asked by on November 03, 2015

Whenever I have my 2007 Nissan Sentra in park, the engine makes a loose, rattling noise. I've had vehicles with knocking engines before and this was not a knock. It sounds like a motor mount or something attached to the engine rattling and sounds like the car is broken. It only has 36,000 miles, so I doubt it is in any danger mechanically, but the sound is annoying! Is this an urgent issue that needs attention?

The rattle is most likely coming from a faulty motor mount on the passenger side. The motor mount allows the engine to vibrate and hit metal to metal. Your vehicle should be put up on a lift while in park, and the rattle inspected. Replace the motor mount if needed. Check all other mounts as well and replace if needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

My dashboard instrument panel stopped working all of a sudden

Instrument panel failures were a problem with this model, largely caused by water leaks in the windshield/cowl area that found their way to the instrument cluster (Technical Service Bulletin 383318). There was even an informal customer satisfaction program early in...

My car has a little shake to it.

You may have a bad tire or something that is loose on the front end. I would suggest having a mechanic lift and inspect the tires and front end to see if there is a front tire or axle problems....

Car is making a knocking noise when stopping. Other mechanics say it's motor. Some say it's the piston

Unfortunately, there is no way to tell without doing some more testing. The timing and small details about the noises you are hearing may make a huge difference in diagnosing the issue. Lifters will make more of a "clicking"...

Related articles

Symptoms of Bad or Failing Differential / Gear Oil
If your car has exceeded its gear oil service interval, or if you hear the differential whining, you may need to replace the differential/gear oil.
What Does It Mean When an Engine "Knocks"?
If your engine is making a knocking noise it means there's a problem. The wrong fuel octane, carbon buildup, and bad spark plugs can cause knocking.
How Air Filters Affect Horsepower
Air Air filters work to clean the air entering your engine’s combustion chamber. A good supply of air and oxygen is very essential so that the engine can burn fuel efficiently and give you the horsepower you need to drive....