Q: Car revs up and won't rev down. Changed ICV

asked by on

Car won,t rev down changed idle control valve
My car's transmission is unknown to me.

High idle problems are often times related to vacuum leaks or lean fuel conditions. I would start by checking for vacuum leaks and other fuel delivery components, such as the mass air flow sensor, injectors, throttle body, etc. High idle problems can also be caused by faulty or damaged spark plugs. Try checking and/or changing spark plugs as well. You may also want to run a fuel injection cleaner through a tank of fuel as sometimes something as simple as a dirty injector can cause a high idle or surging idle problem. If you would like to have this taken care of, a certified professional from YourMechanic can come to your car’s location to diagnose the high revving issue and assist with a proper repair.

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. Car revs up and won't rev down. Changed ICV

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: When I stop my car shakes really bad.

I really need more information to give any sort of advice that might help you out. What is for certain, a car that shakes is not running well. Since this occurring while your car is at a stop, you may...

Q: The code came up crank shaft sensor and replaced it and now won't start

You may have got a bad sensor if the engine was running before the sensor was replaced. Also check connection and installation of sensor for problems. If it still does not start then you will need to have further testing...

Q: Low rpm idle

Since you had the battery disconnected the computer needs to relearn the idle again. I would recommend having the throttle body cleaned and then the throttle relearn process done so the idle can stabilize and be relearned by the computer....

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...
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.