Q: 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 1,000 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
  1. Home
  2. Questions
  3. Q: Mass air flow sensor

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: Can't lock car

Hello. If your key is no longer working with the lock cylinder in the vehicle, it may be possible that the cylinder needs to be replaced. This means that you would need a new key for the new cylinder, and...

Q: What is the average labor cost to replace the engine in a 1997 lexis es3000

It takes about 15 hours to remove the engine on the 1997 ES300 and substitute another one. That figure does not include ANY time for rebuilding or re-conditioning. It is based simply on removing the complete engine from the vehicle...

Q: Q: Car does not start

Hello. If the engine is struggling to crank, or not cranking at all then the cold temperatures may be playing a role in your starting issues. As the temperature decreases, the amount of effort required to start an engine increases,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.