Yo, first start each morning has my wrx (my97) hopping for the first few km's, goes away when its at running temp, anyone had this problem?

Yeah bro , most likely your high idle valve.

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do you mean the IACV?

An idea about what mods, or at least ECU you're running would help.

Also, Subaru's dont have high idle valve's as such. Honda's do.

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My car does this when it's very cold too...

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MY02 Liberty B4

Let the car sit and warm up before you drive, it might help.

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I did this before I changed my apparant "high idle valve " lol
I got told that's what it's called lol
what is it called then ? Ya know the little thing on top of the motor controlled by the computer that controlls your rpm?
Mine got all carboned up and did the same thing. Went to the wreckers to find out what it was and he said it was a high idle valve. Lol!

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I've got no idea what is causing your issues Robbo, like I said, a bit more info about your car is required before you've got any chance of having it diagnosed via the interwebs.

However, while we're taking about Idle Air Control Valves (IACV), The IACV is simply a solinoid with a rubber plunger on the end of it.This is how you clean it.


1) Remove two screws at the front and rear of the unit.

2) Carefully slide the solenoid out of the Throttle Body/ housing, beware that there is a brown o-ring that usually falls out if you're not careful.

3) Spray the knob, housing and shaft wth some UEC (Upper Engine Cleaner) or Throttle Body cleaner and clean it all with a rag/ toothbrush to remove all grimey deposits. (Try to avoid extending or pushing-in the solenoid shaft as the car will struggle to idle correctly for a short period after it's re-installed)

4) re-fit the o-ring to the solenoid.

5) re-fit the soleonid using the two small screws you tried not to drop earlier and remember to plug in the harness connector.

6) test-start engine. You may find the idle erratic/ unstable/ high/ low for a short period of time, your ECU will soon sort itself out, and you should be fine.


This may not have any influence on your problem at all, but is a half hour job, and worth a shot.

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So that's what it's called. Thanks bro

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You replace it? or clean it?

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