idle drop when AC engage

[raycor178]

good day to all the members, i am newbie here, may i know what is the cause of my cars idle dropping when the aircon engage? at idle with no AC, rpm is at 750, when I turn on the AC, it would drop to 450 to 500 rpm that causes the engine to shake and it return immediately to 750 rpm. I am thinking of the FICD or AAC valve that is not working. Please help, its unfomfortable if engine is shaking everytime the aircon engage to on. thanks

[beavis327]

Hey Rayfrom what I can gather this is a 96 sentra w/ a 1.6ltr w/ a/t. With that make sure your base idle is @850+/- 50 at idle w/ a/c off. If ng you need to adjust base idle. If that cannot be adjusted the iacv are known to get carboned up as well as short out due change in polarity see bulletin ntb97-008 for further details. Check and make sure a/c is not lock up as well. Lock-up clutches have been known to slow motors operation down but you would hear your belt squealing.Hope this helpsSteve