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Old 11-20-2000, 08:31 AM   #1
svxxx-26
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Member#: 1645
Join Date: Jun 2000
Location: Sissonville, WV, USA
Question idle problem - with A/C on

I flogged this for as much as I could on Yahoo, with little sucess:

Simply put, my SVX developed (overnight) an erratic idle with the Climate Control system "on". Rises and falls continuously. Does not do it when system is on "off" or "econ". Someone suggested the "IAC" was malfunctioning. I have replaced the O2 sensors and the MAF sensor, to no avail. Any ideas, anyone?
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Old 11-20-2000, 08:36 AM   #2
CRZ_MSL
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Perhaps your AC compressor is going bad. If the compressor is putting a varying load on your engine, your engine will vary the RPM to counteract it. But then the load on the engine changes again, and the RPM of the engine chases after it.

Sounds to me like either your AC is going bad, or the system that adjusts engine idle under load is going bad.

?????
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Old 11-20-2000, 08:47 AM   #3
glenstiles
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Vehicle:
2002 WRX wagon
Silver, baby, silver

Post

I know that this is a long shot, but did you try disconnect/reconnecting the battery to clear the memory?


Glen
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Old 11-20-2000, 08:55 AM   #4
svxxx-26
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Since the A/C system itself seems to be working fine, I'm assuming for the moment that it is the unit that controls the idle speed under load. Problem is, I don't know what it is called and/or where it is located.
As for resetting the ECU, I've tried that many times. I wonder though if I've given it enough of a chance - does it require many cycles to truly reset itself?
Thanks for the responses!
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Old 11-20-2000, 11:17 AM   #5
XT6Wagon
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Location: WA
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04 STi
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I would bet that the Idle air control valve is gettign clogged, or burning out. I don't know the specifics on the SVX, but the problem sounds like what happens on other cars when the IAC goes bad.
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Old 11-20-2000, 11:33 AM   #6
svxxx-26
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It seems like the IAC valve is the most likely culprit. Anybody have an idea where this thing is located?
Appreciate all the feedback!
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Old 11-20-2000, 02:48 PM   #7
zensvx
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Location: San Jose, CA, USA
Vehicle:
1992 SVX LS-L

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Don't know how much help this will be but...

"On the Loyale, the IAC valve is located on top of the engine in front of the intake air duct. On the Justy, it is in-line between the air filter housing and the intake manifold. On the Impreza, Legacy and SVX, the IAC valve is incorporated into the throttle body."

If you look toward the passenger side and under the "H-6" plastic cover you should see 4 bundles of wires. I believe it is one of those. This book does not gives pictures for the SVX so I am somewhat guessing here.

This book also gives a 13 step process for testing your IAC (should you find it). Let me know if you need that info.
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Old 11-21-2000, 06:43 AM   #8
svxxx-26
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Thanks, I'll look. Someone else suggested that the throttle body might need to be cleaned. If the IAC is incorporated into the throttle body, he may have a good point.
I was hoping it would be something along the lines of the MAF or O2 sensors, meaning something that I could replace myself.
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