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by Simply msFortunate on February 1st, 2007

Simply msFortunate

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2003 Subaru Legacy 2.5L (H4). It idles high at 1500 rpm when I start it, but as soon as I shift out of park it drops down to about 700 or so. Idle air control valve...?

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Answers. 3 helpful answers below.

  • by 8 Jan 2004-10 Dec 2009 on February 1st, 2007

    8 Jan 2004-10 Dec 2009

    All engines idle higher in Park/Neutral than when the car is actually in gear. I don't know the exact tuning specs on an '03 Subi, but 700 RPM (under the load of a torque converter) does not sound excessively high for a cold idle speed.

    As for the 1500 RPM, I've had my cars do that too, usually in the cold, and nothing was wrong with them.

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  • by Christa on March 12th, 2007

    Christa

    on a subaru it shouls be idling somewhere between 900 and 1100 ,1500 is too high i would start with the coolant temprature sensor it tells the computer how cold the engine is so it can adjust the air fuel mixture timing ect. to warm up faster or you could check idle air controll the a.i.t. sensor air intake temprature sensor m.a.p. sensor and throttle position sensor and mass air flow but trial and error on all these sensors can be very expensive the best thing to do is take it to a garage where they can plug it up nop matter if the check engine light is on or not they can plug it and see what each and every sensor is doing while the car is running

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  • by Roundtable on February 21st, 2010

    Roundtable

    I am having the same issue on my 2k legacy wagon. It idles very high, nearer 2000 RPM and then causes the engine light to come on. The code is 1507, IAC solenoid malfunction.

    I am trying to find out where it is in order to clean it, (hopefully) instead of having to replace it.

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