Muffler - Iac (RM35-863829)

Muffler - Iac for Mercruiser - 350 MAG, 4.3L MPI, 5.0L MPI, 496 MAG, 6.2L MPI (If you need to replace the Iac Valve Idle air control, the Mercruiser part number is 862998) our ref; SIE18-7701) Helpful tips ;Merc MPI engine does not start, idle or is beeping twice every minute An IAC (idle air control) is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The IAC controls the air flow at idle speed. A failed IAC causes the boat to not be able to idle. Also, smartcraft equipped boats will give a code of 2 beeps every minute for a variety of issues. Alarms for the cooling temp, oil pressure, and drive fluid level are constant. The most common reason for the 2 beeps every minute is a bad IAC. If you take the boat out of gear by pressing the button on the throttle at the helm and manually control the throttle and are able to start the motor and keep it going yet if you pull the throttle back to neutral the motor dies, the issue is most likely your IAC.