Skip the auto shop - Our mechanics make house calls

Q: Mass air flow sensor

asked by on

My car will be running fine and then it will suddenly jerk once or twice and then shut off, but then it starts back up afterwards. Why is it doing this? The fuel pump has been recently replaced. I did take it to a shop and they said it could be bad fuel, which led me to buying stuff to put in the gas tank to clean it and then it was fine for a month and then out of nowhere it starts to jerk once or twice and then it may shut off when I stop the car.
My car has an automatic transmission.

What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information 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.

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: Necesito cambiar bomba de agua, thermostate, lower radiator hose, cuál es el monto total de reparación incluyendo los repuestos.

Hola. Para una cotización rapida y precisa puede subir a nuestra cita y entregar su informacion de vehiculo. Los precios cambian con locacion, servicio, y modelo de vehiculo so no podria darle una cotizacion sin esa informacion.

Q: Hey, I have a cracked radiator on the side where the plastic is, anyways I can change or fix it without changing the whole thing?

I am not aware of any repairs that can be done to seal the plastic tanks on the radiators. The crack is created due to the plastic getting weak and not being able to contain the radiator pressure anymore. I...

Q: What does the Nissan Intelligent Key™ buzzer mean?

If your Altima is equipped with the Nissan Intelligent Key™, you’ll find that the car warns you if you’re about to lock the key in the car. If the key is left behind when you exit the vehicle, you’ll hear...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...