Intermittent failure to accellerate

If I accelerate on speed , my car runs slow instead of going speed . How can i detect the problem

My car has 114649 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi There,
It sounds like you are describing the symptoms of a failing throttle position sensor. The throttle position sensor monitors the throttle position of the throttle plate inside the throttle body in relation to your foot position on the gas pedal. Based upon the inputs from the sensor reading your foot’s position on the pedal, the ECU then makes the direction to supply more or less fuel to the motor. When this sensor is not working properly, this can cause intermittent responses when pressing the gas pedal. I would suggest having a professional from Your Mechanic come to you home to diagnose and inspect your vehicle.

How to Identify and Fix Common car Problems ?

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

Fuel injectors may become dirty over time and not be able to provide as much fuel to the cylinder as is needed. Dirty fuel injectors may cause the engine to run lean which will in turn, cause hesitation when accelerating.
Trouble accelerating can come from a few different engine issues. These include, but are not limited to, dirty fuel injectors, low fuel pressure, and restricted airflow. A problem with the mass airflow sensor, throttle position sensor, or engine speed sensor can also cause a car to have difficulty picking up speed.
Bad or Dirty Spark Plugs: Spark plugs are responsible for igniting the fuel in the combustion chamber. If they are not working correctly or are dirty they don`t ignite the fuel cleanly and the car can misfire or sputter. The plugs will need to be replaced or cleaned.
Common reasons for this to happen:

Defective fuel pump or filter: Since the fuel pump is responsible for supplying your vehicle with fuel, it can cause a loss of power when it begins to wear out or when the in-tank filter becomes clogged and prevents the free flow of fuel.

The most common cause of poor engine airflow is a clogged or damaged air filter. The air filter in your car protects the engine by catching all kinds of debris before it can enter the cylinder and cause more damage.
There are a range of reasons why your car is juddering when you accelerate. Your vehicle could have dirty fuel injectors, a damaged fuel pump, a blocked catalytic converter, a faulty mass airflow sensor, broken spark plugs, or even an accumulation of moisture.
A sputtering engine may just mean you need to have your fuel filter replaced. All vehicles have a series of vacuum hoses that create the fuel pressure. If one of them leaks or is damaged in any way, you will lose significant fuel pressure. The vehicle`s exhaust system can greatly impact the engine`s performance.
One of the most common causes of jerky acceleration is a dirty fuel injector. Your fuel injectors are responsible for pushing fuel into your engine`s cylinders. This means they control the timing and amount of fuel used to keep your engine running.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Hi I have this dtc:P0698 description (failure of wiring and connection. failure of spark plug control module) engin no start
ANSWER : Hi there. Typically this is a failure in the ignition control circuit. Most of the time it is a wiring failure going to the ignition coils such as a bad ground connection. It can also be caused by a failure in the main computer which happens most of the time on this vehicle.

I usually start by checking the circuit for power to eliminate a blown fuse or ignition switch issue. If no problems are found there then I move on to testing the wiring and the computer to see which one the vehicle needs.

If you are looking to have this repaired, consider YourMechanic, as a certified mechanic can come to your home to diagnose your trouble code firsthand and repair this as necessary.

Car headlight intermittently on/off even after new bulb
ANSWER : An intermittent headlight issue is a common problem. The most likely cause are the headlight assembly itself, a wiring issue, or a faulty switch. Any of these have the potential to cause the headlight to intermittently fail. If the headlight assembly is cracked or shows signs of condensation, then the assembly is most likely the issue. A qualified technician, such as one from YourMechanic, will be able to diagnose the headlight fault and perform any repairs required.

Intermittent failure to accellerate
ANSWER : This may be a result of a couple of different things, but is most commonly associated with a faulty throttle position sensor. The throttle position sensor monitors the throttle position of the throttle plate inside the throttle body in relation to your foot position on the gas pedal. Based upon the inputs from the sensor reading your foot’s position on the pedal, the ECU then makes the direction to supply more or less fuel to the motor. When this sensor is not working properly, this can cause intermittent responses when pressing the gas pedal. I would suggest having a professional from Your Mechanic come to you home to diagnose and inspect your vehicle.

Intermittent failure to accellerate
ANSWER : Hi There,
It sounds like you are describing the symptoms of a failing throttle position sensor. The throttle position sensor monitors the throttle position of the throttle plate inside the throttle body in relation to your foot position on the gas pedal. Based upon the inputs from the sensor reading your foot’s position on the pedal, the ECU then makes the direction to supply more or less fuel to the motor. When this sensor is not working properly, this can cause intermittent responses when pressing the gas pedal. I would suggest having a professional from Your Mechanic come to you home to diagnose and inspect your vehicle.

Steering wheel shakes, light came on power steering assist failure 2010 Ford Escape
ANSWER : Hi there – this behavior, sometimes called "phantom steering shake" is often due to a steering torque sensor in the steering column. This device sense how much effort is being put into the steering wheel to make a turn. This determines how much "power assist" the electronic steering adds to your own effort to turn the steering wheel. If you are getting the "shake" while idling and still, this can be the beginnings of failure of this sensor. I would first go back to Ford to discuss the Recall (#14V284000), because this appears to be precisely the problem you are having. Escalate to Ford Customer Service. If this is unsuccessful, I recommend a steering wheel shakes inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, confirm this diagnosis, and give you an accurate assessment of damage and cost estimate for repairs.

My Accord gives out a "Charging system failure" warning. I drove home about 15 miles and then parked my car. After about 3 hours,
ANSWER : Hi there. On a new Honda Accord, the Charging System Failure warning light typically indicates a problem with the battery, alternator or other component inside the charging system of your vehicle. However, with less than 10,000 miles, this is most likely an electrical glitch or stored error code that was triggered. Since your car is "new", I would recommend contacting your Honda dealership first, to tell them about this warning light and ask them how they wish to handle this issue; as it should be covered under warranty. If they can’t help you, please set up a warning light inspection, and one of our mobile mechanics can come to your location and determine why this light came on.

Charging System Failure and Battery Light on
ANSWER : Hi There,
It sounds like you may have a voltage regulator issue that might not be allowing the alternator to charge the battery sufficiently. The voltage regulator could be allowing the alternator to supply too much or too little amperage to the battery resulting in the battery never maintaining a consistent charge as it is designed to. The voltage regulator is a unit that regulates the charging of the battery by the alternator. 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. A common sign of this is usually the acid inside the battery boiling causing the battery to swell. You may also smell a bit of smoke due to things potentially getting too hot. 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. I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

on a 2009 Golf 1,4I Intermittent self start problem-on turning the key there is a ‘wizz" sound but the starter does not kick in.
ANSWER : Hi there. Typically the ’whizzing’ sound you’re hearing is the starter spinning over without the input gear engaging with the flywheel. This can happen intermittently and eventually will fail entirely. It’s a good idea to have the starter and starter relay replaced at the same time, to ensure the system has the best opportunity for longevity.