Q: Idiling issue

asked by on

As the car begins to slow down the car idles high to about 1500-2000 rpms and goes down after coming to a complete stop. I also have to apply more force than normal on the brake to slow down. This occurs most of the time. What's the problem?

My car has 50000 miles.
My car has an automatic transmission.

The power braking system in your 2012 Toyota Highlander uses an engine vacuum to increase the operators brake pedal effort and applies a higher amount of pressure on the brake assemblies. This function is found in today’s higher performing vehicles.

A high idle can be caused by a vacuum leak causing the engine to increase it’s RPMs and add fuel to compensate for the added air. Have a technician inspect the performance readings with a scanner as the vehicle is running. As a safety precaution I’d recommend having the braking hydraulic system inspected for any failures as well.

If you decide to get this fixed, consider YourMechanic, as a certified technician can diagnose your high idle and braking symptoms firsthand. From there you’ll have a clear idea of what needs to be fixed.

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
  1. Home
  2. Questions
  3. Idiling issue

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: How do you replace the battery in the remote for a Ford Fusion?

Your car’s Remote Entry system is certainly convenient. It provides you with the means to lock or unlock the doors from a distance, open the trunk, and even set off a panic alarm if you feel threatened. Of course, the...

Q: High RPM, cannot shift gears on 1998 Lincoln Mark VIII

Hello. We will be happy to assist you with your 1996 Lincoln Mark VIII. I suggest to have the vehicles computer scanned and trouble codes retrieved by a technician. Being that the Check Engine Light comes on when the problem...

Q: My heater/air conditioner blows out hot and cold air appropriately, but makes a horrible grinding noise

This is a sign of a faulty blower motor. As you know, these have electric motors in them that wear out over time and will begin to make squeaking or grinding noises as the bearings begin to wear out. The...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.