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Old 09-05-2010, 10:30 PM   #1
Scooby Specialist
Member#: 89821
Join Date: Jun 2005
Location: A Series Of Toobs
2015 STI LE

Default Throttle issues on 2006 2.5i

I'd like to find out if this is normal (in which case I'm getting rid of the damn car) or if there is something fixable here that someone else has run into.

This is a 2006 2.5i wagon that is primarily driven by my wife. It seems to have a pretty big gap in the throttle map from 0 to ~10% -- you can't smoothly coast at low (below 25 mph) speeds without trying to forcibly remove your passenger's head from their shoulders because the throttle goes from slight acceleration into full engine braking with no zero point. It's extremely irritating.

In a probably related symptom, it frequently revs on its own up to 1500 RPM or so when pulling into my driveway or into a parking spot. Stays there a few seconds then idles back down to a reasonable level.

The symptoms go completely away after a ECU reset, and return again in a couple days, probably as the ECU relearns based on crap information.

Any ideas? I've heard some people call it essentially normal ... but given that my STI has DBW throttle and no such issues, I know Subaru is capable of writing a perfectly functional throttle mapping table. That leads me to believe something is up, though there aren't any codes, so whatever's going on is not out of bounds.

I'm this ---><--- close to just giving up and trading it for something else. Aside from being anemically slow, I don't really have a problem with this car and would probably keep it a few more years if I can figure out why the throttle is finicky.
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Old 09-06-2010, 11:21 AM   #2
Scooby Specialist
Member#: 153374
Join Date: Jul 2007
Chapter/Region: South East
Location: Ocala, FL
2001 Outback Wagon


I'm really not familiar with the newer cars so wait for someone else to chime in, but from my days spent on this forum that sounds like the IACV (Idle Air Control Valve). Now, whether or not your car has one is beyond me. But if it it does, and it just needs to be cleaned, it's easy.

Do a little search for IACV clean, you might find some very helpful posts.
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