Car Engine Revs in Idle
What is Idle Speed?
Idle speed is the speed at which a car’s engine runs when the vehicle is not moving and the transmission is in neutral or park. The idle speed is typically set by the manufacturer and is usually between 600 and 1,000 revolutions per minute (rpm).
Why is Idle Speed Important?
Idle speed is important because it affects the following:
* Fuel economy: A higher idle speed can lead to decreased fuel economy.
* Emissions: A higher idle speed can lead to increased emissions.
* Engine wear: A higher idle speed can lead to increased engine wear.
What Can Cause a Car’s Idle Speed to Increase?
There are several factors that can cause a car’s idle speed to increase, including:
* Vacuum leaks: Vacuum leaks can cause the engine to run lean, which can lead to an increase in idle speed.
* Idle air control valve (IACV): The IACV is a valve that controls the amount of air that enters the engine at idle. A faulty IACV can cause the idle speed to increase.
* Throttle position sensor (TPS): The TPS is a sensor that tells the engine control module (ECM) the position of the throttle. A faulty TPS can cause the ECM to think that the throttle is open, which can lead to an increase in idle speed.
How to Fix a High Idle Speed
There are several ways to fix a high idle speed, including:
* Check for vacuum leaks: Inspect all of the vacuum hoses and connections for leaks. Repair any leaks that you find.
* Clean the IACV: Remove the IACV and clean it with a throttle body cleaner.
* Adjust the TPS: Follow the manufacturer’s instructions to adjust the TPS.
When to See a Mechanic
If you are unable to fix the high idle speed on your own, you should take your car to a mechanic. The mechanic will be able to diagnose the problem and make the necessary repairs.
Conclusion
Idle speed is an important aspect of a car’s performance. A high idle speed can lead to decreased fuel economy, increased emissions, and increased engine wear. If you notice that your car’s idle speed is high, you should take steps to fix the problem.
