24
Apr
Turn the engine off again and reattach the air intake duct work to the throttle body. Most newer cars and trucks have this to help control the engines idle.
Most newer cars and trucks have this to help control the engines idle.
How to check idle air control valve. Checking to See if the Idle Control Valve is Functioning 1. Use a code scanner to check error codes. If your vehicle was built prior to 1996 you will need an OBD I scanner.
Start the engine and take note of the idle RPMs. Insert the key into the ignition and start the engine. Shut the car off.
If there is an open or shorted circuit in the idle air control solenoid driver circuit or the idle speed is out of range it will usually set one or more fault codes and turn on the Check Engine light. If the light is on you must plug a scan tool into the diagnostic connector and read out the codes that set the light. How to Check an Idle Air Control Valve.
If playback doesnt begin shortly try restarting your device. How to Check an Idle Air Control Valve Step 1. Open the hood and remove the screws holding the idle control valve to the throttle body on the back of the.
Unplug the electrical plug running to the control valve. It may pull right off but you may need to squeeze the. Commonly called an idle air control IAC valve or idle speed control ISC valve this device is used on many cable-operated throttle bodies to regulate the engine idle speed.
One of the easiest ways to test your idle air control valve is to simply look at it. Check to see if the valve stems have dirt on them or if they are burnt. Check the valve opening on the throttle body to make sure that there is solid contact between the valve and the stem.
Step 3 - Use Voltmeter. Turn the valve over until you see the valve openings. Go behind the engine and unscrew the idle air control valve from the throttle body.
2 Pull the electrical plug off the control valve. If the top has a release tab then squeeze that as you pull. 3 Take out the idle control valve and flip it over.
Turn the engine off again and reattach the air intake duct work to the throttle body. Start the engine and rev and hold to 1500 to 2000 rpm. Until no white smoke is coming out of the exhaust pipe.
If the idle speed still surges after this the IAC valve is defective and needs to be replaced. In this video I go over how to clean and check your Idle Air Control Valve. Most newer cars and trucks have this to help control the engines idle.
The IACV valve is operated by a step motor. This motor has winding phases and is actuated by the output signals of ECM. Each time the IACV opens or closes to.
A bad idle air control valve could certainly be one reason for this to happen. If the number of revolutions per minute seems peculiar to the engine control unit it will let you know by activating the warning light. When an idle air control valve fails it can cause the engine to idle erratically and even stall.
Sometimes a weak idle air control motor will can cause engine problems without triggering a MIL check engine light. Inspect vacuum lines when servicing the idle air control valve and replace any that are broken or dilapidated. Symptoms of a Bad IAC.
Over the years I have had to diagnose idle quality issues. In the beginning I had a difficult time determining if the IAC was functioning. In this video I show you how to get to the throttle body and idle air control valve on your car how to clean them what are some symptoms of a dirty or clog.
Idle air control valve replacement. How to replace idle air control valve in your car DIY with Scotty Kilmer. How to fix a car that idles poorly by replacin.
The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed or in some cases a surging idle speed that repeatedly climbs and falls.
Check Engine Light comes.