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Dirty idle control valve - Why


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7 replies to this topic

#1 anaphe

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Posted 13 January 2004 - 02:03 PM

So I had some stumbling at idle a few months back and cleanded the IAC valve with great success and then the car ran like a champ BUT it is now getting bad again after 3 months. Why is this happening?

Is it blow by causing this? Car has 190K KMs on it and seems to run great still with lots of power.

#2 ScoobySchmitty

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Posted 13 January 2004 - 02:07 PM

I've got the same problem. Your IAC might be going bad. I really need to replace mine, my cold idle is non-existant!

#3 Legacy777

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Posted 13 January 2004 - 02:10 PM

the pcv valve dumps a misty oil blow by back into the intake.....and I guess just normal operation causes them to get gunked up.

#4 anaphe

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Posted 13 January 2004 - 04:01 PM

NT

#5 Legacy777

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Posted 13 January 2004 - 05:45 PM

ehh....it won't fix how the pcv system works. It's just that way... Only thing you can do is put a catch can from all the breather vents before they go back into the intake track. Other then that....keeping the oil from the breathers is a lost cause.

#6 cookie

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Posted 13 January 2004 - 07:06 PM

and with that many Ks it deserves a bit of wear. A lot of other engines would already be dead.
I would just plan on doing a cleaning every few months as long as you plan to keep the car.

#7 Setright

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Posted 14 January 2004 - 02:04 AM

Erm, Josh...the Subaru PCV works "backwards" compared to most others. The PCV valve draws straight from the crankcase, pulling fresh clean air - ahhh! - through from the valve covers. My point: A catch-can/oil-separator would only be needed on the hose that connects up to the PCV valve.

#8 Legacy777

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Posted 14 January 2004 - 10:46 AM

I'll have to take a look at the pcv diagram.......I think I remember it acting different depending on how much vacuum you have or throttle position.




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