In town, when I turn on the A/C, the compressor turns on, the VSC switches and the A/C idle up on the carburetor increases the RPM at idle to about 900 (which I have set using the FSM directions). While idling or after driving for a few minutes, however, the A/C idle up VSV kicks off, and the idle goes back to 600 (or a little less since the The AC idle up speed is indeed controlled by an adjustable, vacuum operated servo on the side of the IP, just like the power steering idle up mechanism. Mine raises from 600 to around 800-850 rpm. I think the standard idle speed for an auto is higher than a manual but an idle up of 1200 is too high, as you have found, but is easily adjusted. This is just a little follow up video on how I ended up having to adjust my IAC valve. Please see my other videos for more in-depth information if you are ha 547. 164. Palm Beach Gardens, FL. Jun 23, 2020. #3. DIYPNP needs a 2N2222 which it has internally but is not wired up. Relay 1 & 2 circuits are 2N2222 rated at 600 ma which activate the relay coil directly via pin-54 & provide sensing to pin-10. Pin-10 is used as a sense to determine when the Clutch Cycling Pressure Switch is closed. Disconnect IAC (Idle Air Control) Solenoid. If engine stalls, turn the throttle stop screw in one full turn and restart. Repeat as necessary until the engine will idle with IAC unplugged. Set idle using throttle stop. Idle speed can vary depending upon mods made to the engine. Set to where you are comfortable with the idle speed. Your MegaSquirt-II™ controller can control an Idle Air Controller (IAC) to adjust the amount of air entering the intake manifold based on the engine's coolant temperature. The number of IAC "steps" is user set in a 10 element coolant temperature table. With IAC control, your MegaSquirt-II™ controller can be tuned to adjust the engine speed 0tPNp.

how to adjust ac idle up