Car vibration, engine shuddering at idle

When the car is stopped completely and starts running, a very noticeable vibration appears. It seems to be coming from the transmission tunnel area. It is also present at higher speeds but not as much. When I quickly accelerate, the vibration stays the same. Also, while idling, the engine starts shuddering a little. What might be the cause of this shuddering?
Experienced mechanics share their insights in answering this question :
Hello. It sounds like the torque convertor is malfunctioning causing the car to vibrate and shudder. It is also possible that there is a problem with the drive shaft being out of balance. One more possibility is that the transmission mount or engine mount is faulty and causing this problem. Have a certified technician, like one from YourMechanic, diagnose the vibration issue and assist with the correct repairs.

How to Identify and Fix Common car Problems ?

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

CV joints That Have Gone Bad – Working together with the drive shaft, cv joints get the power from the engine to the wheels and, if they are failing, can be the source of your vehicle shaking in idle. Broken Engine Mounts – As the name implies, these parts help secure the engine to the vehicle.
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.
If your tires are unbalanced, underinflated, or just worn down too much, it can lead to shaking. A simple visual inspection of your tires can be all it takes to avoid these problems. You should always maintain the optimal tire pressure and get your tires rotated and balanced regularly.
Engine vibration can be a result of many different issues in your vehicle, but when it occurs at a low RPM it usually is the result of faulty spark plugs, poor fuel pressure, or even an engine misfire.
The most prevalent cause of vibration is problems with your wheels or tires. The potential problems include improper wheel and tire balance, uneven tire wear, separated tire tread, out of round tires, damaged wheels and even loose lug nuts.
Installing new spark plugs is the best way to resolve such vibration related issues. The timing belt ensures the accurate functioning of many critical components of the engine. Any issues with the timing belt can cause your car`s engine to vibrate.
When the fluid in a transmission becomes dirty and contaminated, the particles in the fluid prevent it from building up enough pressure in the transmission lines. In turn, this will prevent proper pressure contact between transmission plates when they are applied. As a result, the transmission will begin to shudder.
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.
Any unusual shaking or vibrating forces coming from the engine is cause for concern. It could be something as simple as old spark plugs producing an uneven power delivery, it could be something serious like worn or broken engine mounts, or it could be even more serious in the case of internal engine damage.
Vibration in a diesel engine occurs due to unidirectional combustion forces caused by the changes in gas pressure inside the cylinder, structural resonance and alternating inertia forces concentrated on different engine parts.
So, what causes car shakes when parked? Worn-out or misaligned motor mounts, worn or misaligned belts, and issues with fuel intake are common causes. Also, faulty spark plugs, ignition coils, spark plug wiring, and an oxygen sensor can cause car shakes when parked.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Car not speeding up smoothly, service engine light on when first start driving and car vibrating
ANSWER : Hi There,
It sounds like you may have a dirty or faulty mass air flow sensor. The problem this can cause may also be compounded when the engine is cold due to the change in air density in cooler weather. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays information about fuel and air temperature, air speed entering the motor and many other things to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bit of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. I would suggest having a professional from Your Mechanic come to your home to diagnose and inspect your vehicle.

My car started idleing rough, vibrations soon as start car, vibrations soon as I accelerate, vibrations, rough idle bad
ANSWER : This sound like you may be having an engine misfire. Have the system checked and scanned to see if codes are present for an engine misfire. If it is, then a mechanic can check to see if a coil or spark plug has failed. You may have oil leaks in the valve cover seals that has caused the ignition to short out in the spark plug holes. A repair of your valve cover gaskets may be necessary, along with the other components that I’ve mentioned. I’d recommend having the vehicle looked at by a qualified technician who will be able to diagnose these misfiring symptoms and fix it accordingly.

The car vibrates when engine running (idling).
ANSWER : Hi there. The engine and transmission mounts need to be replaced. The mounts keep the vehicle from vibrating when the engine is running and is most likely felt at idle. The shocks will no contribute to the vibration as the soul purpose is to keep the wheels on the ground at all times. If you need further assistance with your car vibrating, then seek out a professional, such as one from Your Mechanic, to help you.

The engine of the car runs, but when I push the gas pedal it does not accelerate, and the engine does not rev.
ANSWER : Hello. It sounds like you may have an issue with your throttle position sensor. This sensor sends a reference voltage to your power-train control module, which uses that to determine ignition timing and fuel trims. If the power-train control module is not detecting the proper signal from the throttle position sensor, the engine may not accelerate properly. It’s probably a good idea for you to have a professional mobile mechanic come to your location and complete a car is slow to accelerate inspection first, so they can pinpoint what is causing this issue to occur and they will recommend the right repairs be completed.

Car vibration, engine shuddering at idle
ANSWER : Hello. It sounds like the torque convertor is malfunctioning causing the car to vibrate and shudder. It is also possible that there is a problem with the drive shaft being out of balance. One more possibility is that the transmission mount or engine mount is faulty and causing this problem. Have a certified technician, like one from YourMechanic, diagnose the vibration issue and assist with the correct repairs.

Reduced engine power and car shuts off
ANSWER : Hi there. If there is carbon build up on the valves in the engine then that can cause a rough running condition and even a check engine light but that will not usually cause the vehicle to stall. It sounds like you have another issue going on here. From my experience with this vehicle most of the time this is caused by a voltage issue. Most of the time it is a loose or dirty ground connection or an issue with the ignition switch. I usually start by scanning the computer for codes to see what is coming up as that can assist in finding the issue. If the codes do not help then the electrical system would need to be diagnosed to see where the power is being lost. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the check engine light is on and why the vehicle is stalling] https://www.yourmechanic.com/services/car-is-stalling-inspection

Engine has a cranking noise and car vibrates… also service engine soon light is on
ANSWER : Hello. The symptoms you describe would suggest that the starter is not disengaging immediately from the engine. This is caused by damage to either the starter drive, the engine’s flexplate (or flywheel) or both. The symptoms will only become worse, to the point that the car not starting, and this can happen very quickly. I recommend having a certified professional diagnose the rough idle and Check Engine Light so that this can be corrected properly.

When I start up the muffler vibrates an car is making a sputtering sound an engine is not idling smoothly. What is wrong can I dri
ANSWER : If the car operates really poorly and is on the verge of stalling, then it’s safer to fix it first and then drive it. Diagnostics and repairs can be performed on a mobile basis, that is right at your location. To request mobile service, please use YourMechanic’s rough operation/poor idle service page. If you request that service, the responding certified mechanic will come to your location, diagnose the issue(s) and estimate the required repairs. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.