What is the AAC valve?
AAC Valve. This is the Idle Air Control Valve. It allows you to adjust idle up or down. If you have tried adjusting your idle and it just doesn’t change or changes marginally, then this valve is probably bad.
What are the symptoms of an idle air control valve ( IAC )?
Another symptom of a potential issue with the idle air control valve (IAC) is; an illuminated Check Engine Light. If the engine control module detects an issue with the idle air control valve circuit or signal; it will set off the Check Engine Light to notify the driver that there’s an issue.
What should the resistance be on an IAC valve?
Using an ohmmeter, measure the resistance between pins 3 and 2 on the (IAC) valve. Resistance should be 10-14 ohms. If resistance is ok, proceed to the next step. Finally, if resistance is out of range, replace the (IAC) and retest. Using an ohmmeter, measure the resistance between pins 1 and 2 on the (IAC) valve.
What’s the best way to clean the AAC valve?
The brass screw can tighten or loosen the spring that shuts aac valve. It is best to screw the big brass screw clockwise at first because threads are filled with epoxy. You can then clean the threads and brass screw will unscrew and come off so you can clean the valve. Ensure unit grounded properly.
Is there a second ground for the IACV?
A wire from metal part of iacv to engine would provide a second ground. Make sure car is grounded properly too. What is resistance reading between negative battery post and engine chasis. Resistance should be low for there to be good ground.
Another symptom of a potential issue with the idle air control valve (IAC) is; an illuminated Check Engine Light. If the engine control module detects an issue with the idle air control valve circuit or signal; it will set off the Check Engine Light to notify the driver that there’s an issue.
Using an ohmmeter, measure the resistance between pins 3 and 2 on the (IAC) valve. Resistance should be 10-14 ohms. If resistance is ok, proceed to the next step. Finally, if resistance is out of range, replace the (IAC) and retest. Using an ohmmeter, measure the resistance between pins 1 and 2 on the (IAC) valve.
The brass screw can tighten or loosen the spring that shuts aac valve. It is best to screw the big brass screw clockwise at first because threads are filled with epoxy. You can then clean the threads and brass screw will unscrew and come off so you can clean the valve. Ensure unit grounded properly.
A wire from metal part of iacv to engine would provide a second ground. Make sure car is grounded properly too. What is resistance reading between negative battery post and engine chasis. Resistance should be low for there to be good ground.