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anaphe

Dirty idle control valve - Why

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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.

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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.

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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.

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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.

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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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