Skip the auto shop - Our mechanics make house calls

Q: Engine knock, is it totally broken?

asked by on

I'm pretty sure the engine in my 2010 Nissan Sentra is completely broken. It's been knocking for a month now and when I went to start the engine this morning, it sounded like a lawnmower driving over wine glasses. The knock was very severe yet the car is just under 45,000 miles! At this point, is there anything that can be done?

The engines in most of these cars are pretty noisy on start up and quiet down after a few minutes of running. If your noise is an engine lower end knock and not a lifter noise, or if the noise does not go away after a few minutes, then you have other internal engine problems like main or rod bearings or piston slap. The engine noise would have to be inspected to by a trained technician to determine where it is coming from. Nissan will not honor any engine warranty without proof that the engine was maintained with oil changes at the intervals specified in the owner’s manual (or earlier) using the recommended oils.

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

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 shifted the lever to drive mode, but it goes to reverse mode. What is the problem?

You are very nearly right. There is a bowden type cable that connects the the shifter to the transmission. It has adjustable ends and one or more of those adjustments has probably worked loose. That or you might need a...

Q: power steering problem.

Hello. Noise could be a sign of trapped air, low fluid level, or a mechanical fault in the pump. While the system is cold, check the fluid level. If the fluid level is OK, remove the cap and turn the...

Q: Front creaking noise appears when driving. The noise is on the right side.

Hi there. The issue that you are having is the lower control arm bushings are worn out and dried up. I recommend replacing the lower control arm bushings on both sides on the front of the vehicle. The rubber becomes...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.