2004 Subaru Outback Idling is goofy

N8BOXER

MEMBER
2004 SUBARU OUTBACK
4 CYL
AWD
AUTOMATIC
123,000 MILES

When I first start the car my rpms shoot up to nearly 2000 and then drop to 1500. I realize it may take a little to warm up but this also happens when I stop at lights and signs. There has been some vibrations but I'm replacing a motor mount on the drivers side, butthe rpms still stay pretty high for just idling. Im not sure what this is but i'd like to fix this issue. If u have any ideas, I would be very greatful

5 Replies

LEGITIMATE007

MECHANIC
5,121 POSTS

I suspect a bad or dirty idle air control valve, I would first try to clean it and the throttlebody. And see how it goes, sometimes it just has a buildup of carbon.

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Monday, May 10th, 2010 AT 9:27 AM

LEGITIMATE007

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https://www.2carpros.com/how_to/how_to_tune_up.htm

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Monday, May 10th, 2010 AT 9:28 AM

LEGITIMATE007

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Is there a check engine light on?

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Monday, May 10th, 2010 AT 9:29 AM

N8BOXER

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2 POSTS

No. The engine light isn't on. For about a week it was on and that was about a month ago but it went off itself. Another guy told me an auto switch or auto valve or something might be dirty but I have no idea what that is. Any chance u guys know what it's supposed to idle around for rpms? And thank u I really appreciate your help :)

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Monday, May 10th, 2010 AT 9:38 AM

LEGITIMATE007

MECHANIC
5,121 POSTS

Yeah thats just what I mentioned, the idle air control valve and throttlebody is probably dirty with carbon. I sent you a link that shows you how to clean the throttlebody, the idle air control valve is part of that, so it just self explainatory