Q: My car is hesitating / jerking at speed intervals of 20 mph, 30 mph, 35 mph and 40 mph.

asked by on November 21, 2016

My car is hesitating / jerking at speed intervals of 20 mph, 30 mph, 35 mph and 40 mph. This comes and goes but happens enough that I have a service appointment scheduled for tomorrow with the dealership. Any thoughts? Additional questions welcomed.

My car has 33000 miles.
My car has an automatic transmission.

This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the motor. When this fails, this 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 may cause a hesitation, loss of power or jerking reaction when this sensor is malfunctioning. When this is not working properly, you may also notice a strong smell of fuel. I would suggest having a professional from Your Mechanic come to your home to diagnose your mass air flow sensor.

Was this answer helpful?
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

One lowbeam headlight out

The headlights are powered separately on different circuits form the body control module in the right lower instrument panel inside the car. You may need to check the connector to this module to see if the wire connection got melted...

2003 Hyundai santa fe, automatic, When in reverse, there is a loud grinding noise, what is the issue?

Hi there. Usually when a grinding noise is occurring while only in reverse, it's an indication of an inner reverse gear failure. It's also common for a CV joint or inner axle shaft to make this type of noise when...

How do I turn on or turn off the sound system?

To turn on your sound system, press the Power/Volume button. Press this button a second time to turn off the sound system.

Related articles

What Does the Mass Airflow Sensor Do?
How How often does the mass airflow sensor need to be replaced? Mass airflow sensors (MAF) have no expiration date. They are not included on the manufacturer’s scheduled maintenance list of things to replace based on mileage, like spark plugs...
A Buyer’s Guide to the 2012 GMC Sierra
The The 2012 GMC Sierra may not have sold quite as well as the Ford F-150, but that doesn’t mean you should dismiss this rugged and reliable model. For one thing, the Sierra is available in a half-ton version (1500)...
A Buyer’s Guide to the 2012 Toyota Camry Hybrid
More More and more manufacturers are offering their most popular passenger cars in hybrid models, and America’s top-selling passenger car is no exception. The 2012 Toyota Camry Hybrid is fuel-efficient, comfortable, and convenient. Key Features The upgraded HSD (hybrid synergy...