My car rpm is going up and down and my speed meter is too...

Q: My car rpm is going up and down and my speed meter is too. i have an Chevrolet 2012 cruze. what could it be?

asked by on November 11, 2017

my car rmp is going up and down and my speed meter foes up and down too. My car jerks like its trying to change gear but having a hard time.. i have an Chevrolet 2012 cruze. what could it be?
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. Additionally, as a result, this may also cause problems with shifting properly due to the inconsistent signals sent to the transmission control module as a result of the erratic engine RPM’s. I would suggest having a professional from Your Mechanic come to your home to diagnose and inspect your vehicle.

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

What does the Rear Access Open message mean?

The Rear Access Open message will appear on your driver information center (DIC) when the trunk is not properly closed. After you close the trunk, the alert will go away.

How do I set the clock?

Your car’s clock provides you with the time at a glance. It’s located under the radio display and above the heating and air conditioning controls. Whether you have an automatic climate control system or a manual air conditioning system, setting...

How do the door position lights work?

Your car is equipped with a number of interior lights that turn on either when you open a door or put the key into the ignition. The door position lights are set to come on when the door opens by...

Related articles

The Best Used Cars to Buy If You’re a Wedding Planner
As As a wedding planner, the demands placed on your time are going to be significant, even if you’re only dealing with one or two couples. You need to be a master juggler when it comes to your time and...
A Buyer’s Guide to the 2012 Toyota Corolla
Not Not only does the 2012 Toyota Corolla continue to be one of the best-selling compact sedans in the United States, but it also continues to maintain very high resale values. If you want a car that you’ll get your...
A Buyer’s Guide to the 2012 Chevrolet Suburban
The The 2012 Chevrolet Suburban offers large amounts of space to carry around a growing family or to transport supplies to your favorite camping spot. It is available in heavy duty and half ton models. Key Features The 1500 Suburban...