I’m getting a vibration and knocking either under my feet or the engine when I do 65+.

Im getting a vibration and knocking feeling under my feet when I do 60+. I do have a torn rear rubber motor mount. Could that be the issue or could it be something else? It almost feels like its my axle but I could be wrong.

My car has 182000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
The torn mount can account for the vibration and consequently should be replaced prior to further diagnosis if the vibration continues once that repair is accomplished. If the mount is torn and the engine/transaxle is consequently mispositioned, that can also ruin your CV axles because the axles are then operating outside of the intended range (angle). OEM, dealer supplied mounts are preferred for quality reasons. In your circumstance, you should request replacement of the motor mounts and then continue on with the vibration diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Damaged Tie Rod Ends: Tie rods connect your steering system to help move the wheels when you turn your steering wheel. Creaking while turning can be a sign of damaged tie rods, but it`s more usual to hear a knocking sound when making tight, low-speed turns.
Tires. This is usually the most common cause of unwanted shaking. Unbalanced tires on your Sentra can cause the steering wheel to shake when you accelerate to 50 miles per hour. This shaking generally stops once you exceed 65 miles per hour because of the extremely fast rotations.
Motor mounts keep your engine attached to the car. Weak or broken mounts can`t hold the engine tight in the engine compartment and creates a vibration at idle. If the shaking subsides when the car is in Neutral, this could indicate the motor mounts are responsible for the vibrations.
The most common reasons a Nissan Sentra engine makes a ticking noise are low oil level or pressure, an issue with the ignition system, or an exhaust leak. Search our network of RepairPal Certified shops near you to speak with a technician about your issue. Oops!
Tie Rods: A clunking noise when turning typically means there`s a loose or broken tie rod. Sway Bar Link: With a failing sway bar link, you will not only notice a knocking noise while you are turning but also poor handling.
Clunking

If the clunk happens when you drive over bumps, there might be a problem with your car`s suspension, or part of the exhaust could be loose. However, if your car clunks when you`re turning corners, it could be a problem with the steering, wheels and tyres, or a worn-out wheel bearing.

If vibration is felt at certain speeds, the tires may need to be balanced. If the tires are wearing unevenly and causing the car to vibrate, the driver may need a tire rotation. In some cases, the driver may need new tires to solve the problem of vibration.
Common reasons for this to happen:

Loose connections at the positive and negative battery terminals. Very dirty or clogged air filters can also cause your engine to underperform. Loose timing belts are another likely cause. A mechanic will check these and replace them if they appear loose and worn.

One of the main reasons why your vehicle could be vibrating at idle could be due to worn out spark plugs. When a vehicle`s spark plug is faulty, it can interfere with the air-fuel ratio leading to improperly firing cylinders, resulting in a misfire while idling. Replacing your spark plugs will solve this problem.
Dirty or Worn-Out Spark Plugs

Often, your car shakes when idle simply because it`s time to replace your spark plugs! When yours are dirty or worn out, they fail to fire in the right way. If this happens, they`re unable to ignite the fuel located within each of the piston cylinders on time.

Transmission issues: Several models of the Nissan Sentra struggled with transmission issues, particularly models with continuously variable transmissions (CVTs). These transmissions are prone to losing power, leading to stalling and even failure.
The most common reasons a Nissan Sentra has a rattling noise are the ball joints, struts or strut mount, or a problem with the sway bar links. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
It`s easy to misdiagnose the cause of engine knock, so you might have to pay a visit to your mechanic. Each of the engine knock causes on the previous page has a specific cure, and most of these fixes are simple. However, it doesn`t guarantee the knock will go away.
A knocking sound when going over bumps can indicate a problem with the suspension struts. There might be a clanking sound of metal hitting metal when you go over bumps. This could show the rubber bushes that join parts of the suspension have failed.
There are four sounds in particular that you should look out for: creaking, grunting, rattling, and knocking. See your auto collision center if you hear any of these noises, and keep reading for more on the four sounds of suspension problems.
If you begin to feel persistent shaking in your car, it`s best that you get to the problem right away before continuing to drive. Continuing to drive with the shaking can result in further damaging parts, ruining your tires, and other costly problems that could be avoided by a quick trip to your mechanic.
Tire Problems

Tires are one of the most common causes of car vibrations. One of the possible issues are out-of-balance tires. Your problems may not be noticeable at slow speeds, but the shaking will intensify as you accelerate to 55-60 miles per hour. The steering wheel, or even the entire car, will start to vibrate.

To help confirm that the vehicle has an engine speed related vibration, with the vehicle stopped, put it into park or neutral and raise the engine speed to the RPM at which the vibration occurred to see if the vibration can be reproduced. If reproduced, diagnosis should begin with engine speed related components.
An easy method to reduce vibration is to install a clean damper on the rear shaft of the motor. Clean dampers are basically hermetically sealed plastic cases with an inertia body packed with silicon gel. The extra inertia and silicon gel help absorb the vibration and provides a stable damping effect.
Some simple warning signs that the transmission is having problems: Transmission is slow to respond when shifting. Grinding, shaking, vibrating.
Worn or dirty spark plugs can cause a petrol car`s engine to misfire in one or more cylinders, which can cause vibrations when the car is idling or at running speeds. The easiest solution is to replace your spark plugs and check the related wiring. Engine vibrations can also be due to the air and fuel systems.
The most common signs of bad spark plugs include start-up trouble, rough idling, sluggish acceleration, declining fuel economy, engine misfiring, and engine knocking.
Improperly functioning spark plugs cause an uneven burn of fuel in the engine, resulting in fluctuating RPMs and a louder noise. You might also experience increased vibrations of your vehicle while sitting idle or while traveling at low speeds. These vibrations originate from the engine and can shake the entire car.
Dependable, efficient A to B car

This generation (B15) avoided CVT, engine, and other problems the newer Sentras suffered with. As an A to B car, it lacks refinements you`d expect of an economy.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I’m getting a vibration and knocking either under my feet or the engine when I do 65+.
ANSWER : The torn mount can account for the vibration and consequently should be replaced prior to further diagnosis if the vibration continues once that repair is accomplished. If the mount is torn and the engine/transaxle is consequently mispositioned, that can also ruin your CV axles because the axles are then operating outside of the intended range (angle). OEM, dealer supplied mounts are preferred for quality reasons. In your circumstance, you should request replacement of the motor mounts and then continue on with the vibration diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

I have an engine vibration that starts when I am in idle.
ANSWER : The engine vibration will need to be checked to see if it is worse in drive than it is in reverse. If the vibration is less apparent in reverse, then the motor mounts will need to be neutralized to center the motor mounts. If the vibration is even when the engine is in neutral, then the engine crankshaft damper is bad and causing the engine vibration. I recommend having a certified mechanic, such as one from YourMechanic, check to see if the motor mounts or the engine damper is at fault. They will be able to diagnose your engine vibration and ensure that the correct repairs are made on your vehicle.

Check engine on knocking engine milky cap but not in oil change loud knocking noise while driving and cold start up
ANSWER : Coolant leaks can be external or internal. If the coolant is leaking internally into the cylinders or crankcase, that will require a fairly significant repair. If the coolant is leaking externally, unless the leak is at the head gasket or the lower intake manifold, external leaks can be repaired readily. On the engine you have it was really common to have coolant leaks at the lower intake manifold, so common that the gasket there was completely designed and a different repair procedure was specified (higher torque on the manifold studs). To get the coolant leak diagnosed, please use YourMechanic’s coolant leak diagnostic service link. The knocking noise is obviously of concern. Unfortunately, typically, such noise is from worn bearings, connecting rods, and other major components. The noise might be accompanied by low oil pressure. My best advice is have the cooling leak diagnosed in case that is readily resolvable. The mechanic can evaluate the noise and if it is internal the engine will eventually have to be disassembled and rebuilt. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Check engine is on after new alternator
ANSWER : It sounds like you may have a failing voltage regulator. When the voltage regulator is not working properly, this may result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. In some cases when a battery is too weak or damaged, it may no longer hold a charge for any length of time, in which case the alternator may be doing its job, but the battery is just simply too weak to hold a charge. In either case, I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

Vibrates at 65 mph
ANSWER : A few different things can cause the vehicle to vibrate at freeway speeds. The brake rotors, brake pads, and tire balance are a great place to start. Other common causes would be the tire itself, bent rim, wheel bearing, or a suspension component failure. I suggest getting assistance from a qualified technician who will be able to diagnose the vibration you’re experiencing and perform any repairs that are required.

Vibrates at 65 mph
ANSWER : Have the driveshaft checked for a binding or a bad U-joint. This will cause the vibration to go throughout the entire vehicle. If you had the vehicle on a lift and ran the vehicle to the speeds indicated, you will feel the vibration in the drivetrain. A certified technician, such as one from YourMechanic, can come to your car’s location to diagnose your vehicle’s vibration issue and let you know what needs to repair.

I’m getting power to distributor coil, but I’m not getting power to the spark plugs.
ANSWER : Hi there. Check the spark plugs with a spark adapter tool to see if there is a park induced from the coil. If there is no spark, then the spark plug wires could be burned and need replaced. If the tool is getting spark, then the spark plugs need replaced. If you need further assistance with your ignition system, then seek out a professional, such as one from Your Mechanic, to help you.

is there any way possible a clogged untake before air filter or a bad pcv can ever lead to rod damage in the engine
ANSWER : Hello. I have seen similar things happen with this engine before. Typically it has nothing to do with the PCV valve though. Majority of the time it was because a rod bearing was failing. Once the vehicle was turned off, it spun the bearing and then the noise occurred. The most common reason that I have come across for this issue is a failing catalytic converter. This can cause excessive pressure and even debris to back up into the engine which can cause it to lock and bend a rod. This can be an expensive repair. If you needed a second opinion, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the knocking you’re experiencing with the vehicle.