My car idle idling high in drive and revving to over 2000 RPM when its put in park

Tiny
GRAMITH
  • MEMBER
  • 2000 MITSUBISHI GALANT
  • 170,000 MILES
Will replacing my idle air control valve fix this? My 2000 Mitsubishi Galant (2.4L I4) is idling high while in drive or reverse (around 1100 rpm), and when it is put in neutral or park it revs to over 2000 rpm very quickly. The car runs fine otherwise, but my gas mileage is suffering (by about 25%).

From everything I can find online it appears to be my idle air control valve, but when I brought this up to a mechanic during some other repairs he seemed to dismiss it. I also removed the IAC to make sure it wasn't burned out; it looks fine and moves in and out when the car is started and different gears are selected.

The IAC valve malfunction is one of 3 check engine codes in my computer right now(P0505). The others are P0170 and P0400. It's an expensive part so I want to make sure that it is causing the problem before I buy it.
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Saturday, February 18th, 2012 AT 9:29 PM

2 Replies

Tiny
RIVERMIKERAT
  • MEMBER
Also clean the EGR valve. Use some fuel system cleaner. And scan for codes.
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Sunday, February 19th, 2012 AT 12:33 AM
Tiny
RIVERMIKERAT
  • MEMBER
P0170 is related to fuel trim.
P0400 is EGR malfunction.
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Sunday, February 19th, 2012 AT 12:52 AM

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