My Audi a4 1.8t keeps vibrating at higher speed what could be the issue

My car is having two issues first my car is accelerating slower than usual and my car vibrates at higher speeds what could be the cause.

My car has 170815 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Among common possibilities for degraded acceleration are throttle body faults (electronic throttle controls, mass airflow sensor, torn air intake hose), worn out spark plugs, faulty fuel pump or restricted fuel system, and large vacuum leaks (including EGR malfunctions, PCV system, leaking intake manifold, leaking EVAP purge valve). A scan tool would be used to look at real time conditions within the engine (particularly fuel trim, etc.) and identify the root cause. Depending on the cause of the slow acceleration, there is a possibility it could be linked to the vibration you are experiencing at higher speeds. If there is no link to engine operating condition, generally vibration at speed is wheel/tire/suspension related. If you want both of these issues diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a loss of power inspection/diagnostic and the responding certified mechanic will get this resolved for you. 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 ?

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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.
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.
Common reasons for this to happen:

Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump: The fuel pump is responsible for transferring fuel from the tank to the engine.

The source of the problem could be from tires that are not balanced or a worn-out spark plug. It could also be loose lug nuts. A car also vibrates for a number of reasons when you accelerate. Typically it`s from a damaged inner CV joint.
When the inner CV joint is damaged or begins to fail, you will notice your car vibrating under hard acceleration. As it gets worse, the minor vibrations turn to violent shaking when under load. Damaged CV joints usually occur because of a tear in the joint boot.
A loose or disconnected air hose or vacuum hose can cause quite a bit of violent shaking and vibration in your car`s engine. To correct the problem, simply look for any loose or disconnected hoses and reattach them and replace them as needed.
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.
Among the potential underlying causes are vacuum leaks, EGR system malfunctions, malfunctioning oxygen sensors, dirty fuel injectors, fuel pump malfunction, faulty spark plugs, a faulty mass airflow sensor, or a faulty throttle position sensor.
An Audi A3 may cut out or lose power because of underlying issues ranging from it using a poor-quality battery to a clogged fuel filter.
Key Takeaway Rattling noises when accelerating can be caused by a number of issues, including damaged or worn-out suspension components, bad wheel bearings, low transmission fluid, loose heat shields, and faulty engine components.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My Audi a4 1.8t keeps vibrating at higher speed what could be the issue
ANSWER : Among common possibilities for degraded acceleration are throttle body faults (electronic throttle controls, mass airflow sensor, torn air intake hose), worn out spark plugs, faulty fuel pump or restricted fuel system, and large vacuum leaks (including EGR malfunctions, PCV system, leaking intake manifold, leaking EVAP purge valve). A scan tool would be used to look at real time conditions within the engine (particularly fuel trim, etc.) and identify the root cause. Depending on the cause of the slow acceleration, there is a possibility it could be linked to the vibration you are experiencing at higher speeds. If there is no link to engine operating condition, generally vibration at speed is wheel/tire/suspension related. If you want both of these issues diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a loss of power inspection/diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

severe steering wheel vibration at speeds above 60 mph, but not below 60, and severe vibration during braking.
ANSWER : If you can wiggle the tire side to side then you either have a problem with inner or outer tie rod ends. You may have both of them that are bad. This will allow the side-to-side movement, but brake rotors that are warped is the fault that may be responsible for the wobbling. You should have the tie rod inner and outer joints checked and replaced. Also check the rack and pinion bushings to make sure they are properly in place. If you need help with any of this, a certified mechanic, such as one from YourMechanic can come to your car’s location to inspect your vehicle’s vibration issue.

Vibration when turning left at highway speeds
ANSWER : Hi there. Vehicle vibration when driving above 55 mph is commonly attributed to tire / wheel balance. However, the other symptoms you’re describing lead me to believe that you might have damage to wheel bearings (as you indicated you have some play when you move them), or rear stabilizer bar (which is the play in the bushing you described perhaps). Since you had the brakes completely rebuilt, I’d suggest to have all of your wheel bearings inspected, especially since you said you noticed a vibration in your brake pedal. On a 1997 Toyota Camry, that symptom would usually be a front end wheel bearing problem, but could be due to all wheel bearings wearing out. If you would like to have the vibration inspected, a certified technician from YourMechanic can confirm the faulty component and replace the wheel bearings if necessary.

Could Vibrations at all speeds up to 75 be caused by bad upper ball joints?
ANSWER : Shaking or vibrating at high speeds is often times related to tires that may be out of balance, low on air, potentially a badly aligned front end, failing suspension components or ball joints. When any of these things are not geometrically proper or aligned correctly, this causes an imbalance in the way the vehicle travels down the road and may cause the vehicle to vibrate or shake violently. This type of condition usually gets worse with more speed and in your case is quite likely related to ball joints that are worn out. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

Intermittent issue where after a stop car is stuck in first, speedometer at zero. Had output speed sensor changed, no change.
ANSWER : Hello there, a few possible faults could cause the vehicle to become stuck in first. The most common would be low fluid level, shift solenoid, transmission range sensor, or a transmission mechanical fault. I’d suggest getting this looked at by a qualified technician, such as one from YourMechanic, who will be able to diagnose your shifting issue and perform any repairs 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.

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.

My car vibrates when I set the cruise or maintain speed at 55 mph or higher. What is wrong?
ANSWER : If the vibration only occurs act certain speeds, then an unbalanced tire is the likely cause. I would suggest that you have your tires balanced and go from there. If you continue to have vibration issues, then have a certified technician, like one from YourMechanic, determine the exact cause of your concern.