Q: Squealing when driving and breaking and rpms jump by 500 while driving.

asked by on

When i am driving a high pitched squeal happens intermittently when i brake sometimes. Also the rpms will jump up by about 500 almost viciously while driving even at a steady pace. What can i do to fix this?

My car has 240000 miles.
My car has an automatic transmission.

Hello There, It sounds like you may have two separate issues going on here. The squealing sound is likely your brake pads which have wear indicators on them that are designed to produce a squeaking sound signaling that it may be time to replace them soon. The RPM fluctuation may be due to 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 causing a jerking reaction or loss of power in some cases. I would recommend having a professional from YourMechanic come to your location 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Squealing when driving and breaking and rpms jump by 500 while driving.

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: Q: no start

Hi Leo. Thanks for submitting your question today. Usually when you physically can see a spark under the hood, it is an indication of an exposed electrical wire. The problem is trying to locate the source of the electrical short,...

Q: Coolant everywhere under hood.

Hi there. When this occurs, it's typically due to a coolant line breaking (in most cases, one towards to the top of the motor). This could also be caused by the radiator cap breaking or an overheating problem. Regardless of...

Q: Q: Cracked radiator?

If you have added fluid to the radiator more than once in a year and only have to add more than a few ounces then you may have a leak in the radiator. The stains are the green dye they...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...