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Old 12-05-2010, 08:54 PM   #351
El Guapo
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Quote:
Originally Posted by K.Linchpin View Post
El Guapo, if you can get the iacv to spin freely, I don't see a reason for taking it apart.
how is everyone getting it to spin without taking it apart?
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Old 12-09-2010, 10:57 AM   #352
obyone
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Quote:
Quote:
Originally Posted by Rawker View Post
my engine looks like this, where is the IACV?

note this is not my picture
Quote:
Originally Posted by eXotek View Post
anyone have any coment on this? My engine looks like that too, 2003 Impreza TS. where is the IAVC?
Quote:
Originally Posted by GDAryder View Post
it could possibly right under that fixture where the throttle body meets the air filter.
I know it's an old post but the Idle Control Valve is here:
held in place with 2 phillips head screws.



This is off a 2000 RS.
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Old 12-09-2010, 05:29 PM   #353
nategreat923
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Has anyone tried this on a Legacy? The BC5?
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Old 12-24-2010, 11:55 AM   #354
subrandon
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I cleaned mine with alcohol and qtips and re installed with new gasket(had to go to two dealerships to fine one) last night. No change to idle and still throwing the P1507 code.
I noticed while cleaning the valve "door" wouldn't close all the way. It would stay 1-2mm open.
I could move it open quite easily and it would spring right back immediately.
Is this right? is it supposed to stay open just alittle?
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Old 12-24-2010, 11:04 PM   #355
rick-l
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Quote:
Originally Posted by subrandon View Post
I cleaned mine with alcohol and qtips and re installed with new gasket(had to go to two dealerships to fine one) last night. No change to idle and still throwing the P1507 code.
I noticed while cleaning the valve "door" wouldn't close all the way. It would stay 1-2mm open.
I could move it open quite easily and it would spring right back immediately.
Is this right? is it supposed to stay open just alittle?
Don't remember but you did check to be sure the cruise control cable isn't holding the throttle open right?
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Old 12-25-2010, 10:28 PM   #356
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Quote:
Originally Posted by rick-l View Post
Don't remember but you did check to be sure the cruise control cable isn't holding the throttle open right?
Cruise control cable is fine. first thing i checked. picking up a used IACV unit from another member in two days for $75.
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Old 01-07-2011, 07:59 AM   #357
H240sx
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i think this is what is wrong with my impreza. tired cleaning the MAF and fuel pump becuase i though thats what was causing the car to die out after 5secs. ill try and pick up a new gasket and hopefully solve the issuse
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Old 01-25-2011, 02:12 PM   #358
ezil71
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My bugeye idle isn't high/low, but it sounds like either a misfire or some coolant is getting past the gasket because at idle I get a stumble and see some white smoke when it does.

Does this sound like the IAC is dirty, or is it more likely a spark plug/gap issue? The car is otherwise running nicely (especially after some seafoam).

Edit:

Used some seafoam to clean the IACV, which worked quite nicely. With new plugs I still have a bit of a stumble at idle, but the cleaning of the IACV was well worth doing. I poured SF into the cambers and let to sit for 15 minutes, then used q-tips to clean it to a like new shine (same with the part still in the car)

What is the sensor right next to the IACV on the throttle body?

Last edited by ezil71; 02-04-2011 at 02:27 PM.
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Old 03-11-2011, 10:02 AM   #359
z0mgluke
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Can't begin to thank the OP for this thread enough, thank you so much. Saved me the extortionate price that Subaru here in Australia wanted to charge for a replacement IACV ($800... yeah)

Cleaned it out with petrol and degreaser, new gasket ($14... urgh) and all sorted. Cheers!
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Old 03-11-2011, 02:40 PM   #360
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Thx OP the fix solved a hunting idle I'd been having since changing the clutch. I soaked it in seafoam and used the qtips. Dried it and then applied wd40 to the hinged areas. Works great.
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Old 03-17-2011, 07:13 PM   #361
SubieRSjustin
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Replacing my iac tomorrow. Brought my swapped rs to Precision Tuning for a smoke leak test and sure enough my iac was leaking. The o ring is actualy coming out. Been having some weird idle issues lately so I'm hoping this will fix er right up.

Did some haggling and got it for cost $230 from dealer $4 for gasket.

Great thread!
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Old 03-17-2011, 07:15 PM   #362
Boostmaster
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O'reilly's auto parts can get this IAC for around $160 or so... Unfortunately no gasket is included.
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Old 03-30-2011, 06:39 PM   #363
SoCalWrx
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Just thought I chime in with another piece of info that might be of interest. I recently did the IACV cleaning. It helped a bit, but the car was still missing a bit of the bottom end torque I had long ago. Long story short I replaced the engine to purge-valve hose and voila the torque returned to my low rpms.

Part #09530C040



When I replaced the hose I noticed that the diameter of the one coming off the car was three times that of the one going on.
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Old 03-31-2011, 10:26 PM   #364
sgdought
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Talking Disconnected and reconnected power to the IACV and Shazaam!

I went by the Subaru dealer in Denver and ordered a gasket and was going to try to clean it this weekend. The symptoms were idle dropping to 0, car stalling at stop, idle so low it was rough if it did not die. This afternoon, before I picked up the gasket, I was going to try running the engine with the power to it disconnected. I disconnected the wiring harness, and thought, "it is just going to die", so I did not even try to start it with the power disconnected. I reconnected the wiring harness after maybe 10-20 seconds, started it, and it died immediately. I started it a second time, and the idle went to 1200, down to 1000 after maybe 30, seconds, and settled in a 700 - 800 like before. Shazaam, Sarge! I guess I "rebooted" my IACV.

It has run beautifully all afternoon and evening. I now have a spare IACV gasket in case I do decide to remove and clean it It was only $8.32, so I can't complain. After spark plugs and a new air filter, it's running very well, especially considering my 2005 Baja has 155,000 miles. (I'm the original owner). I dodged that 500 dollar repair.
Thanks again for the PICs, as I would never even known what I was looking for.

Last edited by sgdought; 03-31-2011 at 10:38 PM.
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Old 03-31-2011, 11:08 PM   #365
jaegmeister
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Quote:
Originally Posted by SoCalWrx View Post
Just thought I chime in with another piece of info that might be of interest. I recently did the IACV cleaning. It helped a bit, but the car was still missing a bit of the bottom end torque I had long ago. Long story short I replaced the engine to purge-valve hose and voila the torque returned to my low rpms.

Part #09530C040



When I replaced the hose I noticed that the diameter of the one coming off the car was three times that of the one going on.
is this legit?
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Old 04-12-2011, 06:11 PM   #366
shemoves
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Just want to confirm, cars that have a DBW throttle don't have to worry about this or am I mistaken?
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Old 04-13-2011, 04:11 AM   #367
OrbitalEllipses
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No IACV on DBW throttle cars. If you've seen the naked manifold, there isn't even an opening for air to enter the IACV. In DBW throttle, the throttle plate is actually opened to maintain idle.
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Old 04-13-2011, 05:30 PM   #368
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Quote:
Originally Posted by OrbitalEllipses View Post
No IACV on DBW throttle cars. If you've seen the naked manifold, there isn't even an opening for air to enter the IACV. In DBW throttle, the throttle plate is actually opened to maintain idle.
What I thought, just want to make sure though. Thanks.
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Old 05-08-2011, 01:18 PM   #369
Radys
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Hi all, can someone help me?
I replaced the catalytic converter and 2xsensors on it, on me car Subaru Impreza 2.5l TS 2002. Then I discovered the error on Knock sensor. I replaced the Knock sensor tu. After replaced it no error for 14 days. Bud now the car start have error P1507 Idle Control System Fault (Fail Safe Mode).
What I have tu du pls? Clean the IACV and putt new gasket? Need help pls coz the errors just show up 1 the converter, then i replace it and another error show up the knock sensor, I replaced it tu and now I am on this P1507 and I do not want bay new IACV coz i ready spend 2000$ for all the sensors and catalytic converter. Du U recommend clean the IACV and new gasket? The car run good, no problem with low engine speed. All sound ok but still error P1507. Btw the car have remote starter, can there be problem? Thx for any help.

btw the error show up when I putt the V-power gas 95 octan, when I run the regular 91 octan gas, the error disappear...

Last edited by Radys; 05-08-2011 at 01:29 PM.
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Old 05-08-2011, 02:28 PM   #370
rick-l
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Quote:
Originally Posted by Radys View Post
now the car start have error P1507
This is a shot in the dark, and I don't know if my 2003 wrx is similar to the NA version, but that is the code I got when my cruise control cable was hung up and would not let the throtle return to idle.
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Old 05-09-2011, 08:31 PM   #371
Boston WRX
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I just cleaned my IACV on my 2005 WRX wagon with 118K miles this past weekend following the instructions in the first post. My car ran terribly during the first start and run cycle. I got a check engine light and awful idle, but my Accessport reported no trouble codes found. I reset the ECU and let the car sit over night.

This morning the idle was a little high, but smooth. During my 8-mile, 20-minute commute, the idle rpms descreased a little bit at every stop sign and red light. By the time I got to my office, the idle was close to 800 and nice and smooth. I took a drive at night and again this evening. The is still smooth and drivability is much improved. no more herky-jerky if letting off the gas in 1st gear at low rpms.
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Old 05-14-2011, 01:43 PM   #372
ogboot
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I'm doing mine right now, and the last shop to have their hands on it didn't use a gasket at all, and it's covered in gray looking permatex junk. What's the best method for getting all this trash off of the throttle body and IACV? Would a scouring pad damage it too much?

Edit: Used a scotch pad, some gasoline and a blade.

Two things that really helped me out were using an impact driver to remove the phillips head screws, and then replacing them with 5mm x20mm socket top screws. Getting it on and off was a cinch.

Last edited by ogboot; 05-14-2011 at 04:46 PM.
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Old 05-16-2011, 07:00 AM   #373
mercfan33
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i have a 2005 2.5 rs 5 speed and it constantly revs itself up when in neutral or when idling it will rev all the way from 1k rpm all the way past redline the only way to stop it is to put it in gear or shut the car off could it be the IACV? i am in desperation as my warranty runs out on the car in a week
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Old 05-16-2011, 10:50 PM   #374
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My '02 started up this morning with a wandering (up to 2000 RPM) and lean (reading '--' on a TUNA) idle. With a little gas it ran fine, but dropping back to idle it returned to this lean, wandering mode.

I pulled the IACV, cleaned it per instructions, replaced gasket, reset ECU, etc. etc. And IT WORKS! So far, so good anyway. We'll see how it handles the commute tomorrow.

I was a little concerned when I first pulled the IACV, because it didn't look like what I'd call dirty. But the cleaning process did pull a small amount of gunk out of there.

Thank you very much for this post!
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Old 05-17-2011, 03:44 PM   #375
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Quote:
Originally Posted by mercfan33 View Post
i have a 2005 2.5 rs 5 speed and it constantly revs itself up when in neutral or when idling it will rev all the way from 1k rpm all the way past redline the only way to stop it is to put it in gear or shut the car off could it be the IACV? i am in desperation as my warranty runs out on the car in a week
If it's under warranty don't waste your time on it unless you can fix it quickly.
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