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Old 12-22-2012, 04:10 PM   #1
Scooby Newbie
Member#: 300176
Join Date: Nov 2011
Chapter/Region: SWIC
Location: Arizona
Default Mystery Sensor

Can anyone please explain to me what this sensor is and how to tune it properly? Digging through the haynes manual revealed no mention of it and after 2 hours of pulling my hair out searching on the forums I regret I've fallen to posting a noob question thread. Any assistance would help, even just what the thing is I can go from there.

This is on a 97 impreza ej22, the reason it is disconnected is because I tried swapping it with the one on my 97 legacy ej25 when I thought it was the sensor at fault for a MAP trouble code, now both cars are having issues idling, especially cold, while it is connected. They seem to idle the smoothest when rotated fully clockwise, but have crap performance while driving. I've been forced to leave them disconnected until I learn how to tune it properly. When I get my scanner back I'll post the codes I pulled from the ECU.

I am a helicopter technician so I know my way around tools and older aviation engines but 'modern' technology that hasn't been approved by the FAA is foreign to me. The sensor in question is the sun faded one that is disconnected, located just under the throttle position sensor/PCV valve.

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Old 12-22-2012, 04:12 PM   #2
Scooby Specialist
Member#: 117980
Join Date: Jun 2006
Chapter/Region: NESIC
Location: Rochester, NH
2005 sti
wr blue


That is your idle air control valve or iac for short
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Old 12-22-2012, 05:26 PM   #3
Scooby Specialist
Member#: 155358
Join Date: Jul 2007
Location: Coon Rapids, MN
2008 Forester
Steel Silver


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