two days ago my 1997 impreza outback sport started having a high idle problem, after it is started and it warmes up the idle will not drop below 1200 rmp. the check engin light is not on and a code reader shows pass. I do not think it is a vacume leak and other than the high idle it is running smooth. i disconnected the negitave terminal for a to reset the computer and it fixed the problem for about 10 min. HELP.

I had a similar problem with my 2.5. It turned out that my IAC was sticking and causing my high idle condition. Rather that remove and clean the IAC. (It's a bit of work). I sprayed carb cleaner through an intake hose that ran to the valve.

 

Valve now moves freely and the idle problem has been cured.

 

Regards;

Ken

thanks i will give it a try. where should i look for the IAC valve so i can spray carb cleaner in it.

Right under the throttle body, can be seen from the passenger's side. Do a search here on the forum--there's lots of info.