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2.5 L Engine rpm modulation
Posted 30 July 2003 - 04:23 AM
Posted 30 July 2003 - 04:51 AM
BTW, how did you get a 1990 Legacy with a 2.5? I thought those didnt' come out in North America until 1995! You must mean the 2.2L.
Posted 30 July 2003 - 06:03 AM
The IAC valve is most likely sticking. It is located below the PCV valve. There was a procedure around here some where on how to clean it. Anyway, the jist of it is, you need to remove the top electro magnet portion of the sensor. Before doing this, make sure you scribe the orientation of the top controller portion to the body, so you get it aligned exactly how it was before. With that off, try and move the IAC valve. It should move freely and be smooth. If it doesn't, remove the hose that connects to the intake arm that's connected to the IAC valve. Spray some brake cleaner in there and work the IAC valve back and forth until things are moving freely and smooth.
The above is assuming you have an AT. If you have a MT, they use a different valve, and from a buddy's experience trying to clean his....it didn't work to good.
oh yeah....do check for vacuum leaks as well before you tear into cleaning the IAC valve.
Posted 30 July 2003 - 02:07 PM
Thanks for the great advice ! I think a vacuum leak is a distict possibility as I noticed some mouse turds around the engine compartment.
I didn't think it was possible to be happier owning a Sooba Roo, but finding this forum certainly has.
88 DL Wagon (same old 1.8L)
90 L AWD Wagon (now with 2.2L engine)
90 L 2WD Wagon (also now with 2.2L engine)
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