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Old 04-07-2006, 12:04 PM   #1
Scooby Newbie
Member#: 86255
Join Date: May 2005
Chapter/Region: MAIC
Location: So Cal
2006 STI

Subaru Stars Questions on Rough idle on 06 STI with the following mods...

I've got an 06 STI. 3000+ miles, did her first oil change. All seems nice.

I've got the following mods to the vehicle (have since 1000 miles).

Side note I've done a proper break in. The rough idle acts as follows. The engine after being warm (run for 20+ mins), will initially idle at around 500-750 rpms, smoothly, then on a cycle (no timers) it will dip and the car will just slighlty shift side to side, while the RPMS drop, and then come back up.

APS 3" TBE catless
5Zigen Header
APS CAI 65mm

Note that I havent taken the UTEC tobe tuned yet. But shouldnt matter at idle the stock eCU is still running things there. Running with throttle the car runs beautifully (could be better w/ tune but still very nice).

Don't need an answer specificaly, more than anything I want some ideas on ways to trouble shoot.

Thanks in advance!
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Old 04-07-2006, 12:17 PM   #2
Scooby Guru
Member#: 5851
Join Date: Apr 2001
Chapter/Region: VIC
Location: Vancouver
09 Forester XT
+ NA Miata


Bets on your intake giving you issues at idle, as you said the stock ECU is running things and it is getting funky MAP readings from your APS causing idle hunting...once you are into the tune (UTEC) it is running properly (from what you are saying).
tora is offline   Reply With Quote
Old 04-07-2006, 12:26 PM   #3
Scooby Newbie
Member#: 86255
Join Date: May 2005
Chapter/Region: MAIC
Location: So Cal
2006 STI

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Correct. The UTEC is in control at that point.

That makes sense.

I believe I can tell the UTEC to adjust that setting at idle, I could be wrong.

Any ideas on ways to smooth that out?

It's not horrible but I'm definately curious how to clean it up a bit.

Thanks for the reply!
origonalp is offline   Reply With Quote
Old 04-07-2006, 12:34 PM   #4
Scooby Newbie
Member#: 107541
Join Date: Feb 2006
Chapter/Region: TXIC
Location: Houston
2006 WRX STI


I'm not sure, but i might be something common to all 06 STI's.

My 06 STI has 4000 miles on it and no mods, yet i also sometimes get the same problem.
It usually lasts for about a few seconds, while waiting at a red light, the rpm will drop below the 500 rpm mark, and the car shakes a little, but then everything goes back to normal.

I was going to go in and have them check it, but it stopped doing it about 1500 miles ago.
StiChiara is offline   Reply With Quote

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