I have Maruti Alto LXI 2004 model.Now it has driven 96000 km. When I drive on traffic with AC,the engine rpm increase as unusually. And also engine power is go down.... what can I do for that??
When the A/C is switched on the engine ecu increases the idle speed by a few hundred rpm to make sure the engine does not stall and keep a "smooth" idle. This is normal.
Also, the A/C system can demand some 10bhp or so during its operation - which is why some people will switch off the A/C when doing an overtake for example.
So, if you want the power back then minimize your use of A/C...