Hey , its my first post here
am a new evo fan
i bought an gsr evo 10
it was amazing till i had this issue

the idel is good when the AC is off
but after turning AC on the idle going down too less than 500 rpm then going up several times till i turn the AC off

the car moods is:
- turbo smart Mitsubishi Dual Port bov
- down pipe
- intake
- exhaust

and i cleaned the maf , then change it , with out any different

what do u think guys ?

 

What kind of intake does it have and how high does the idle actually go when it goes up?

 

k&n intake

almost 200-1000 rpm

 

Check your relays. I had to replace mine cause it had irratic idle. SSP sales a relay package. Look it up.

 

Does the intake have a heat shield i kno my cobb SF intake dont an it messes with my Idle because of the fans kicking in

 

My stock 2013 does the same thing. It jumps from 750 to 1k rpms then go back down once in a while when the AC is on.

 

If your intake has the heat shield then that's normal. When the A/C kicks in the RPM's jump around a bit. I notice it happens when the Fans kick in.

 

K&N intake usually comes with a heat shield unless he bought it used. Or he might be using the drop in filter.

 

Anyone know if this issue is lessened with either the AMS or ETS intake? Or does it become exaggerated over stock?

 

My IX does this as well. When the RPM's get low enough the oil sensor flashed on.

 

I found the problem !! I gust cleaned the air filter and changed the AC filter !!
And now every thing is good

 

Good to know it was a quick and easy fix!

 

Mine did the same thing. It was a vac line issue though.