Is it possible to change the idle speed of an engine?
Now that the engine has been mapped under most stable operating conditions, it is possible to move on to a less stable condition: idle. Because of the slow engine speed, there is a relatively long time between possible corrections the PCM can make at each TDC event.
What does it mean when your car idles for a long time?
The idle of a car engine is kind of like a human heartbeat: You can tell what shape it’s in just by listening. Problems with idle speed —things like slow idle, fast idle, rough idle, or stalling after idling for a few seconds—are symptoms that something is wrong with your engine.
How does the dashpot affect the idle speed?
The dashpot function controls the amount of airflow at closed throttle. At higher speeds more air is allowed through the engine to control pumping losses and drag. The actual amount of dashpot airflow must be reduced over time for the engine to return to idle.
What to do if your car is stalling at idle?
Idle speed is set incorrectly. The Fix: Set idle speed to specs. There may be some type of ignition problem. The Fix: Check and replace distributor cap, rotor, ignition wires, and spark plugs. There may be a fault in the computerized engine control system.
What causes the idle speed to be high or low?
What Causes Engine Idle Speed to be High or Low On a modern fuel injected engine, engine idle is controlled by the engine control unit (ECU) and an electrically operated throttle control module. When the idle is high or low, it could be caused by a malfunction of this system or any of the individual components that comprise the system.
What does idle mean on a car engine?
Engine idle refers to keeping the engine running when the vehicle is not in motion. Generally, idle speed is just enough to keep the engine running without stalling out.
What to do if your car is idling too fast?
A throttle body cleaning is likely to cure the high idle speed as well. There are many possibilities when your engine is idling too fast. Here are some common ones to help guide you towards the root of the problem.
How can I change the idle speed of a glow engine?
Simply turn the ISS clockwise a little to make the idle speed go up, or turn it counter clockwise to make the idle speed go down. You can adjust the ISS any time you want and it won’t change anything other than how fast the engine idles at. Try to adjust the ISS while there is no servo pressure on the screw.