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Old 02-01-2013, 01:54 PM   #1
pilfflip
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Default High idle until warm restart

Just as the title implies.


2002 Legacy
WELL maintained 200,xxx miles
The only modifications are a high flow air filter and STi axle back

It's started idling around 1500 rpm. Nothing apparent provoked it but it seems to have started burning a little bit of oil and I recently put in some Slick 50 in order to regain gasket integrity within the engine. It doesn't seem that any amount of driving will bring down the idle, however, if the car is turned off and restarted it will idle perfectly.

Thoughts?
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Old 02-02-2013, 06:51 PM   #2
pilfflip
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I was expecting more interest in this issue...
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Old 02-03-2013, 04:41 PM   #3
yarrgh
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It's not that I don't like you, I didn't have any good input. Try cleaning IACV? Clean grounds?
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Old 02-03-2013, 08:09 PM   #4
klaus_b2
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idk the answer to the question but my car idles around 1500 on cold start til it warms up lol
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Old 02-03-2013, 08:44 PM   #5
Akimpreza
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Have you checked the plugs, and o2 sensors. Could be they have become guncked up.
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Old 02-03-2013, 08:55 PM   #6
pilfflip
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This idles high indefinitely until I turn it off and restart it right away and it will idle normally.

The plugs and O2 sensors have been recently replace during a tune-up.
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Old 02-03-2013, 08:55 PM   #7
pilfflip
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I don't know anything about IAVC, how and where?
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Old 02-04-2013, 01:33 PM   #8
Awd180
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Quote:
Originally Posted by pilfflip View Post
I don't know anything about IAVC, how and where?
I have a similar high idle on cold start but it goes down once its warmed up. Of course I think if I shut it off before it is fully warm it would drop the idle. You need to search for IACV for specific details. In my case due to a number of mods I assume its valve timing and need of a new ecu map. But with your high mileage it's similar that the valves aren't seated as well as they should from wear.
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Old 02-04-2013, 01:55 PM   #9
pilfflip
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Quote:
Originally Posted by Awd180 View Post

I have a similar high idle on cold start but it goes down once its warmed up. Of course I think if I shut it off before it is fully warm it would drop the idle. You need to search for IACV for specific details. In my case due to a number of mods I assume its valve timing and need of a new ecu map. But with your high mileage it's similar that the valves aren't seated as well as they should from wear.
I hadn't even thought if the wear in the valves simply from use. I don't think that would explain the normal idle by simply shutting off and restarting the car.
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Old 02-04-2013, 02:40 PM   #10
Awd180
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Quote:
Originally Posted by pilfflip View Post

I hadn't even thought if the wear in the valves simply from use. I don't think that would explain the normal idle by simply shutting off and restarting the car.
Things reset, if you start then shut it off within secs does the idle drop? Mine won't, the friction heats them up enough to seat properly after running for a longer period.
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Old 02-04-2013, 03:25 PM   #11
pilfflip
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The very second I restart the car it idles as though its right off the factory line. I suppose I'll get the IACV gasket and clean that out and I'll know more thanks fellas.

Last edited by pilfflip; 02-04-2013 at 03:31 PM.
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Old 02-04-2013, 03:42 PM   #12
Awd180
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Quote:
Originally Posted by pilfflip View Post
The very second I restart the car it idles as though its right off the factory line. I suppose I'll get the IACV gasket and clean that out and I'll know more thanks fellas.
Not what I asked, let it run for no more than a few second then shut it off then restart it.
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Old 02-04-2013, 04:59 PM   #13
GT11
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The idle is higher at the cold start because that's how it was designed. It helps the engine warm up faster. It's completely normal. It happens with all cars made made in the last 15 or so years. You need to start worrying if the idle doesn't go back down after the car is fully warmed up.
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Old 02-04-2013, 06:01 PM   #14
GrundleJuice
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Quote:
Originally Posted by GT11 View Post
The idle is higher at the cold start because that's how it was designed. It helps the engine warm up faster. It's completely normal. It happens with all cars made made in the last 15 or so years. You need to start worrying if the idle doesn't go back down after the car is fully warmed up.
He already said in the first post that it doesn't go down until it is shut off and restarted.
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Old 02-04-2013, 06:16 PM   #15
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If you drive it around and it temps out and then you put it in neutral does it still idle high?
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Old 02-04-2013, 06:49 PM   #16
GT11
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Quote:
Originally Posted by RaceFaceXC View Post
He already said in the first post that it doesn't go down until it is shut off and restarted.
Doh! That's what happens when you browse on a smartphone.

Anyways, as the others mentioned. Cleaning the IACV and replacing the gasket should do the trick.

http://forums.nasioc.com/forums/showthread.php?t=781242
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Old 02-04-2013, 08:58 PM   #17
pilfflip
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Thanks the link. I found that thread yesterday but count find it today when I searched again.
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Old 02-04-2013, 08:58 PM   #18
pilfflip
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Thanks for the link*
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