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Guest Message by DevFuse

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88 spfi wagon occationally hunts for idle

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5 replies to this topic

#1 Guest_subu luvr_*

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Posted 19 September 2003 - 10:40 AM

sitting at stoplight, idling smooth, occationally
it revs up 200 rpm then drops back to where it was
in a 3-5 second cycle

any ideas? going out to pull the codes now

#2 Scrub2k


    Eat, Live, Breath Subaru

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Posted 19 September 2003 - 11:30 AM

Sounds like you have a vaccum leak to me, i'd check all of your vaccum lines, my honda did the exact same thing when i had a cracked vaccum line.


#3 c150L


    Subaru Nut

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Posted 19 September 2003 - 02:05 PM

Might want to check the putor codes if you get bored. I thought someone once said that a bad connection on the the engine coolant temp sending unit can raise havoc. Could the air conditioning have anything to do with it? Don't think it was a Sube, but I remember a car that the idle would spike up just a bit before the AC compressor would kick in. Then the putor would again calculate out the correct idle speed. Just guessing for you.

#4 c150L


    Subaru Nut

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Posted 19 September 2003 - 02:06 PM

Careful with those vacuum lines and plastic fittings. You remember! LOL

#5 archemitis


    guy smiley

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Posted 19 September 2003 - 06:07 PM

that thing always did that, even with the other motor. i think its the idle air controll valve sticking. b12 chemtool helps it go away for a while

#6 Guest_subu luvr_*

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Posted 19 September 2003 - 06:16 PM

thankie, i will try that

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