Skip the auto shop - Our mechanics make house calls

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?

Need advice from certified mechanic? Get help now!

Over 1000 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

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 I determine the correct load limit?

Your truck has a load limit. A load limit is the amount of weight the vehicle can carry. Your vehicle should never carry more than this weight. To determine the correct load limit. Find the vehicle’s placard that reads...

Q: Loud cranking, shaking, RPM decrease upon start - 2004 BMW 325is

Hello. This problem would be considered very serious. I would recommend not driving the vehicle at all until it has been inspected by someone to determine the extent of the damage. Sounds like that are usually either harmful to the...

Q: my daughter has a 2004 Toyota Highlander. the car wont start so i think it's the fuel pump since i can't hear it run. so once i ge

Check the fuse. There could be more than one relay in the circuit, for example a circuit opening relay as well as an EFI relay. The fault could be due to high resistance in the circuit (even at the relay...

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...
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...
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...