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Guest Message by DevFuse

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IAC valve and other fun stuff

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2 replies to this topic

#1 BlueTrain


    Subaru Fanatic!

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Posted 07 April 2005 - 11:29 PM

well, im currently workin on this idle problem. simply put, it will fluctuate 'tween oh about 500-800 when warmed up.. it almost feels like it is missing, and the cadence of the exhaust changes about every 4-5 seconds.. kind of like "ff-ff-ff-ff-ff-pooo-ff-ff-ff" (sorry, tis best i can explain the exhaust sound, lol) after searching the site ive found a few things i am currently checking.. i found the often talked about curse of spfi idle problems, the infamous IAC valve. i popped off the IAC inlet hose and idle stopped completely (engine was cold).. when warm, it will still idle with it off, just idle crappy.. idle does not change if i cover hole with my thumb. i sprayed a little cleaner in there with no change. i also plan on swapping out wires, cap, rotor this weekend to see if this changes anything. plugs are new NGK's. any certain vacuum lines i should look at? any and all help greatly appreciated...

#2 85Sub4WD


    EA82 Junkie

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Posted 08 April 2005 - 12:36 AM

sounds like an infamous subaru vacuum leak - gave me neverending grief when I was carbed - if IAC is not the problem, your idle adjustment screw may be off

#3 BlueTrain


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Posted 08 April 2005 - 02:42 PM

Well, regarding the IAC valve.. how do i know if it is stuck open or not? if i take off the air inlet hose, i see a skinny white plastic piece down in there. this is when the engine is warm. i'm hoping skip will chime in here, as he appears to be the guru of the IAC problem.. thanks..

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