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Old 05-26-2008, 06:43 AM   #151
Barnacules
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Will this work on a 2005 STI?
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Old 05-26-2008, 07:20 AM   #152
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I don't see why not.
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Old 05-26-2008, 12:10 PM   #153
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Yes!
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Old 05-29-2008, 04:46 PM   #154
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I just got my gasket and a bag of replacement cap screws. Here we go!
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Old 06-01-2008, 07:51 PM   #155
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Subscribed
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Old 06-13-2008, 03:49 PM   #156
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I wish I would have found this thread earlier, cause I just spent $300 to replace it at the dealer!
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Old 06-18-2008, 02:56 PM   #157
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Has anyone tried to take those (I think they are) Ribe fasteners out to see if you can clean it better? Is there a gasket there?

Is there a way to exercise it while it is out to get the cleaning fluid in there? It doesn't seem to want to turn.

Is that black gunk coming up through the intake from the intake valves?

It has been so long.... Is this the way it is supposed to work? Cold start 1200 rpm, warm 750.
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Old 06-18-2008, 04:05 PM   #158
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i tried this hoping it would fix my idle issues but it only fixed half of it.

before my car would idle too low or too high. cleaning the iacv fixed the low idle issue but my car still idles 2k-2.5K in traffic.

i think i need to adjust my throttle cable.
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Old 06-21-2008, 12:18 AM   #159
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No Joy


After a thorough cleaning it seems to have improved but after a hot start it still sticks at 2000 rpm
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Old 06-21-2008, 03:39 PM   #160
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Quote:
Originally Posted by rick-l View Post
No Joy


After a thorough cleaning it seems to have improved but after a hot start it still sticks at 2000 rpm
IF engine is hot and idles at high RPM try loosen Your cruise control line. They are usually too tight, and when line heats up, outer part expands, pulling the inner part and making engine idle high.
My car was doing it, i pulled over on highway traffic and loosen it, and idle is fine ever since.
3 minutes of work, and so much better
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Old 06-23-2008, 07:14 PM   #161
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Quote:
Originally Posted by mostasz View Post
IF engine is hot and idles at high RPM try loosen Your cruise control line. They are usually too tight, and when line heats up, outer part expands, pulling the inner part and making engine idle high.
My car was doing it, i pulled over on highway traffic and loosen it, and idle is fine ever since.
3 minutes of work, and so much better

You were right it worked. Look how much it was adjusted to get slack. I am at the end of my rope so to speak.

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Old 06-30-2008, 02:37 PM   #162
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Quote:
Originally Posted by Rawker View Post
my engine looks like this, where is the IACV?

note this is not my picture
I am having the same issue. Please help!
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Old 06-30-2008, 04:12 PM   #163
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Quote:
Originally Posted by rick-l View Post

You were right it worked. Look how much it was adjusted to get slack. I am at the end of my rope so to speak.

I'm glad it worked for You! High idle was making me crazy
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Old 07-12-2008, 12:46 PM   #164
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Quote:
Originally Posted by rick-l View Post

You were right it worked. Look how much it was adjusted to get slack. I am at the end of my rope so to speak.

I just finished cleaning the IACV today, but this also sounds like a good idea. The car has been getting ridiculously hot in the summer heat, and maybe this is contributing to my high idle in traffic. Gonna def. give this a try. Thanks!
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Old 08-13-2008, 03:26 PM   #165
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Excellent thread, though it appears my IACV is dead. I cleaned it twice. Well the first time i cleaned it using the alcohol and q-tip method, used a new gasket and put it back on. I used my AP to reset the ECU. Once I started it rpm climed to 2k and threw the CEL 1507...again.

I cleaned it again with MAF cleaner (I didnt have TB cleaner), soaked it and it looked much cleaner the second time around. I put it back in and idle climbed to 2000. I blipped the throttle and it dropped to 1500. Driving around it seemed fine until I came to a stop. RPM would bounce from around 1500 to 2000. Then it held at 2000 and CEL 1507 came on yet again.

Unless there's anything else I should do I'm thinking it's dead. I did manage to find someone in the classified selling whole throttlebodies. I also checked out car-part.com and they're got a load of TB's on sale. They also seem to list "TB valve assembly" which are listed cheaper than the whole TB. Would the IACV be part of the "assembly"?? Having to possibly spend $300 for a new IACV does not bode well with me
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Old 08-14-2008, 12:08 PM   #166
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Quote:
Originally Posted by gooder77 View Post
Unless there's anything else I should do I'm thinking it's dead.
See that picture right above your post? You did verify that the cruise control and for that matter the throttle cable wasn't holding the throttle open. Try pushing it closed when it is idling fast.

My 2003 threw code P0519 Idle Air Sytem Performance when the cruise cable held the throttle open.

Here is the freeze frame data for the fault

Make: Subaru Model: Impreza Year: 2003
VIN: Not Reported
________________________________________
MIL: On
Diagnostic Trouble Codes
P0519 Idle Air Control System Performance
Freeze Frame (Frame 0) for DTC P0519
Calculated Load: 3 % Coolant Temperature: 192 F
Engine RPM: 1538 r/min Fuel System Status Bank One: Closed Loop
Fuel System Status Bank Two: Not Reported Intake Manifold Absolute Pressure: 10.9 in.hg
Long Term Fuel Trim Bank One: 3.12 % Short Term Fuel Trim Bank One: 1.56 %

Last edited by rick-l; 08-14-2008 at 12:17 PM.
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Old 08-14-2008, 01:39 PM   #167
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Quote:
Originally Posted by rick-l View Post
See that picture right above your post? You did verify that the cruise control and for that matter the throttle cable wasn't holding the throttle open. Try pushing it closed when it is idling fast.
Yep. Checked that. Even put a little more slack and it's still throwing 1507.
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Old 08-21-2008, 10:34 AM   #168
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my friend just put his 02 wrx back together but now it idle alittle below 2000 and when slowing down it surge. the code that came up was the p1507 code and misfire on 2. so we did the cleaning to the iacv but it still does it. so we checked it by pressing the ac button but instead of the rpm rasing it droped alittle. what else should we check or what iwll fix this? thanks
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Old 08-21-2008, 01:02 PM   #169
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I adjusted the throttle cable and havent seen the idle surge now , its been about 2 months. I also have the gasket but never istalled .
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Old 08-25-2008, 08:58 AM   #170
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i wish i would have known the problem w the gasket before doing this to my car. got code P0519 and the cars idle was like 1900rpm. pulled the valve to clean it, put it back on and it didnt work. took it out again, cleaned it again and put it back on and now i had coolant flowing into my TB. when i pulled it out again i noticed the gasket was broken and i had a LOT of coolant inside the TB. after drying it ran the motor again w the coolant line disconected and it just started smoking real bad and running like ****. shut it off and tryed cranking it back on and now it seems my plugs are fouled cause it will turn but wont fire. now i gotta pulled the plugs and try to get watever coolant is left inside the motor before is too late, which i hope is not too late.
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Old 08-25-2008, 05:26 PM   #171
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Quote:
Originally Posted by 08BlueWRX View Post
i tried this hoping it would fix my idle issues but it only fixed half of it.

before my car would idle too low or too high. cleaning the iacv fixed the low idle issue but my car still idles 2k-2.5K in traffic.

i think i need to adjust my throttle cable.
I had been plagued by this same problem (not on the low side, only high idle on hot days). I had ESP tuning in Shirly, MA take a look at it and they put in on their dyno and ran it hot to reproduce. The conclusion:

I have a cobb tuning dp that necessitated the removal of the stock dp heat shield. Without the shielding the extra heat on hot days was enough to shrink the cruise control cable casing causing it to bind up and not release (idle climbs with driving and never backs off).

Solution: disconnected cruise control (who uses it in these cars anyway) and am looking to get a proper heat shield from cobb.

They cleaned my IAC too which helped smooth out the idle (or maybe it's in my head).

hope this helps someone...drove me nuts all summer long idling at 3K in stop and go traffic!
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Old 08-25-2008, 11:50 PM   #172
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Just wanted to update my situation (abridged): Had bad IAC and got the cel 1507. Cleaned it as directed on this thread several times with no luck. I picked up a used one on the boards and I'm back in business! I did notice that the valve on the used one moved both directions when I swabbed it. My bad IAC was stuck though after one last shot with some aggressive swabbing today it moved in one direction, but not the other. I'll be taking it apart completely to see if I can fix the bad IAC. It might have been that the bad IAC was just really gunked up...or the little motor might be really dead. If it's the former I may have a spare IAC for someone.
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Old 08-26-2008, 12:03 AM   #173
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Quote:
Originally Posted by Jason Temple View Post

I have a cobb tuning dp that necessitated the removal of the stock dp heat shield. Without the shielding the extra heat on hot days was enough to shrink the cruise control cable casing causing it to bind up and not release (idle climbs with driving and never backs off).
Dude, I have the Cobb catted DP and I'm using the stock heatshield that has been trimmed a little, works perfectly fine.
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Old 08-26-2008, 09:18 AM   #174
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referring to the 1st post and the 1st pic, may i know what is the hose on the right side of the IACV used for?

i noticed that my IACV has not gotten a hose connected to it.
must be that my mechanic didnt put it back when removing the TGV.
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Old 08-29-2008, 09:23 PM   #175
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Would this be the same location on a 98 Legacy GT, and are there any better pictures out there of the IACV location? My engine bay doesn't look like the one pictured.
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