Skip the auto shop - Our mechanics make house calls

Q: Revs real high when I leave it idling

asked by on

My 2011 Toyota Tundra has a automatic transmission and only about 17,000 miles on the clock. When I leave it idling it will randomly increase revs about 700 rpm and then gradually bring that down over a couple of minutes. Not sure what to do and not sure if this can even hurt the truck. What is happening here?

A: Your engine control system is constantly ma...

Your engine control system is constantly making adjustments in relation to the various input signals it receives. Some idle changes are normal adjustments to a number of things that may be occurring. For example if left idling for a long period, things such as engine temperatures, A/C, defrost operations or exhaust temperature, can all trigger a response from the engine control system to adjust the idle speed. RPM speeds in the range you describe are not uncommon. If the speeds seem to be erratic or extreme, then have a qualified service mechanic, like one from YourMechanic, inspect your engine's high idling speed for any abnormalities. Keep in mind that it may result in finding no problem, unless there is a failed component.

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

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Do I risk a car fire? I have a small oil leak in my car.

There is a very small chance that a slight oil leak would cause a complete engine fire. The oil that is leaked onto the engine will burn, and cause smoke as the result, but this is not the same as...

Q: Starter cranks forever before the engine turns over

Your issue doesn’t appear to be a starter problem. The starter’s only job is to crank the engine. And from your description it is doing that (unless it is cranking very slow). Your problem seems to be that the engine...

Q: When I start my car it the idle is very jumpy and the car feels like it wants to die

There are several possible causes for the idle to fluctuate like this. The most common causes are a faulty/dirty mass airflow sensor, a vacuum leak, an oxygen sensor that is reading incorrectly, or an idle air control motor that is...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...