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: why oil filter be replaced ?

This is a very good question that I wish more people would ask. The reason why you change the filter at the same time you change the oil is due to the fact that the filter has a "lifespan" just...

Q: 98 Nissan quest jerks, skips, and rpm's bounce, when it warms up.

Hi there. The symptoms sound like the fuel pump relay is getting hot and cutting off the fuel pump. Check the fuel pump relay and see if its getting hot. If the relay is getting hot, then the fuel may...

Q: I feel a shimmy on the brake pedal a bit when I brake at high speeds. Does this mean the brakes should be changed?

Usually when the steering wheel shakes during braking, it is caused by a warped rotor or drum. It could also be that there is fluid leaking onto the brakes and it causes them to grab intermittently. A brake inspection will...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...