Car is shaking/skipping when foot is on brake accent 2011...

Q: Car is shaking/skipping when foot is on brake

asked by on July 09, 2017

My car has been shaking/skipping/studdering whenever once every 10-15 seconds when I'm at a stop light/stuck in traffic/ at a drive thru/ any time my foot is on the brake. My check engine light is not on. Spark plugs were replaced 6 months ago. I keep trying to figure out the problem, but nobody is able to help me.

My car has 91500 miles.
My car has an automatic transmission.

What you are describing sounds like a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve making the transition from a higher RPM back down to idle speed while adjusting the air/fuel ratio constantly to allow this to happen smoothly. When the engine RPM drops below the normal range of about 800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location 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

Engine roar while braking/ stuttering while accelerating

Hi there. If the engine noise is happening only when the car is in forward gear, the issue might be caused by a damaged CV joint or the wheel bearings. However, if you're experiencing this sound while braking, it could...

Car door handle from outside is got free and on pushing, it is felt very light and does not open the door.

Hi there. Based on what you have written above, it is probably a good idea to have a professional mobile mechanic come to your location and complete a door handle is not working inspection. This will allow them to determine...

Error code P2187 - 2013 Hyundai Elantra

Hello - the P2187 code indicates a fuel/air mixture that is too lean. This could be caused by a leak in the air intake (the plastic intake tube might be cracked for example), a loose hose on the air intake,...

Related articles

The Best Used Cars to Buy If You’re a Photographer
If If you are a photographer, and you’re considering buying a used car, the big thing to consider is the type of photography you do. Thanks to the advances in digital photography, chances are you’re not hauling around a lot...
A Buyer’s Guide to the 2011 Mercedes-Benz ML450 Hybrid
The The 2011 Mercedes-Benz ML450 Hybrid is Mercedes' first hybrid SUV. It can perform light off-roading tasks while still being able to tow a good amount of weight. It has excellent fuel economy and drives just like the Mercedes-Benz M-Class...
A Buyer’s Guide to the 2011 Mitsubishi Endeavor
The The 2011 Mitsubishi Endeavor is a crossover SUV that manages to provide decent comfort, power and performance into a single package. This also marked the final year of production for the SUV, as it was phased out due to...