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Old 03-22-2011, 11:25 PM   #26
Haelan
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Quote:
Originally Posted by Objector View Post
I'm planning to take mine off, clean it and replace the gasket. i'm having issues with white smoky exhaust at warm idle and my search has led me to the IACV.

Does anyone know the part number for the MY05 STi IACV gasket? is it the same as for the wrx? and where is the IACV located on an 05 STi/STi? doesn't look to be in the same place as on a wrx based on pics.
To my knowledge the STi doesn't have an IACV like the above write-up.
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Old 03-22-2011, 11:30 PM   #27
MY EJ20TTTTTT
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Quote:
Originally Posted by 2gnt2wrx View Post

FYI: If you do the coolant bypass mod, your gasket won't expand.

liarsss
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Old 03-22-2011, 11:35 PM   #28
2gnt2wrx
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Quote:
Originally Posted by MY EJ20TTTTTT View Post
liarsss
Let me re-phrase. If you do this cleaning, coolant bypass mod, and replace the gasket. It won't expand the second time around.
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Old 03-22-2011, 11:57 PM   #29
Uncle Scotty
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Quote:
Originally Posted by Haelan View Post
To my knowledge the STi doesn't have an IACV like the above write-up.
dbw cars dont have the IAC valve, afaik
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Old 01-06-2012, 10:22 PM   #30
ShinanJDM
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Hi , I am very happy to find post on nasioc about iacv,I just get a question about it few weeks ago, 3 wks ago my idle was 2500rpm,them I cleaned it and take the motor off , it was so dirty and screwed already, but after clean, it works better, the idle only 1200,sometimes 1000,but since I got my car it was always 600-800,1200 still so high for me,and I get a used one from a friend of mine ,only 1000miles,almost new, and I cleaned it, and I am pretty sure this iacv is much better than my old one,but after installed with new gasket, the idle is 2000 now!!!Even higher than before!!!! I duno why, i checked and no leaking everywhere, just the idle is 2000,sometimes 2300rpm and always 1000-2000 weeping,as a person who breath after 10000 meters long run,so I dont know why, please help me with the problem,my english is bad ,sorry about that, and my car is a jdm v8 sti. 2L engine,thx~~~~~Paul
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Old 01-07-2012, 03:17 PM   #31
thatsilver2.5rs
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It sounds like what happened to you is that the tab connected to the magnet is not lined up correctly inside of the motor, or it's damaged...

When you put the IACV back together, make sure the tab falls in between the two slots inside if the motor. You can see the tab on the tip of the magnet in this picture:



And you can see the area it's supposed to go in the motor when you look into the motor when everything is apart, or feel it out by gently using the tip of a screwdriver.

When everything's back together, you'll know you did it right if the valve only spins a small amount to become open or closed.
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Old 01-10-2012, 08:03 PM   #32
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I cleaned mine with PB Blasters Lawnmower Tune up spray! Cleaned all the gunk out and works great!
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Old 03-10-2012, 03:17 PM   #33
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And, after all that, if it still doesn't work, the part number is 22650aa182. From THIS THREAD.

I cleaned mine up twice previously, but, at 112k miles, I think it's finally given up the ghost.

And a big +1 for the coolant bypass mod. No swelling after the initial replacement.
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Old 02-22-2013, 10:47 PM   #34
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Wow.. thank you! Did all the troubleshooting and this is what fixed it. Saved me 200 dollars
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Old 03-18-2013, 06:19 PM   #35
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Great write up, thanks. Easy fix for my idling troubles
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Old 03-29-2013, 05:40 AM   #36
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nice write up.

Wish this was around when I needed to clean mine years ago on my EJ205. I didn't remove the sensor part and just did the best I could. A new gasket was more the problem though.

Last edited by iNfEk; 03-31-2013 at 03:23 AM.
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Old 03-29-2013, 09:25 PM   #37
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Must have new gasket
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Old 03-31-2013, 01:51 AM   #38
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This is what one on a 1.8L looks like. The big black thing hanging off the side. Mine was so full of gunk it was completely closed. The car wouldn't run without lots of gas. Pulled it off cleaned it and it's good as new. It was throwing a P1507 The gasket on these is way different, I didn't replace it.

The big black thing hanging off the side. Mine was so full of gunk it was completely closed. The car wouldn't run without lots of gas. Pulled it off cleaned it and it's good as new. The gasket on these is way different, I didn't replace it.
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Old 05-31-2013, 02:29 PM   #39
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so when I take apart the IACV. The magnetc with projection will fit back into a space inside the motor area?
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Old 06-01-2013, 09:42 AM   #40
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Anyone know the best way to remove the two soft metal bolts holding this thing to the throttle body? I've tried every size philips and flat heat screw driver I have and the metal is so soft on the head of the bolt it just wants to come apart.
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Old 06-01-2013, 10:45 AM   #41
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Yea my bolts got stripped as well. What i did to remove em was to place a flat head screw driver on the bolts then tap the end of the flat head with a hammer until i was make enough of an indentation on the bolts to get it to nudge a bit
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Old 06-01-2013, 10:53 AM   #42
2gnt2wrx
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Put a little pb blaster, or wd40 on there too. Worst comes to worst, you will have to drill it out and re-tap it.
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Old 06-01-2013, 11:26 AM   #43
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Quote:
Originally Posted by juztin180 View Post
Anyone know the best way to remove the two soft metal bolts holding this thing to the throttle body? I've tried every size philips and flat heat screw driver I have and the metal is so soft on the head of the bolt it just wants to come apart.
get an impact screwdriver, they're cheap at harborfreight
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Old 06-02-2013, 01:17 AM   #44
iNfEk
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Quote:
Originally Posted by fastnoypi View Post

get an impact screwdriver, they're cheap at harborfreight
Nah. Just get a #2 Phillips head screw driver and a small hammer/another screw driver...etc and lightly tap as you then the screw driver. If you're stripping it out you probably have the wrong head size screw driver.

Alternatively though if you can get needle nose vice grips and clamp on the screw head it should be enough to break the seal. Try not to damage the head. If not you'll need 5mmx20 0.8 cap head bolts to replace. I replaced mine after removing.

I also used M5 washers.

In addition I replaced the special 5 point torx plus screws with new Phillips head screws as well. Pictured in my attachments (4mmx20 0.7)

All from Home Depot
Attached Images
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File Type: jpg image-3074165020.jpg (184.5 KB, 83 views)
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Old 07-25-2013, 11:38 AM   #45
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While I was at the hardware store digging up the new screws....

I found an o-ring to replace the motor to valve body, that is about as perfect a fit as you can get.

Size 3/4ID, 7/8OD, 1/16 wall.

Fits nice and snug around the valve body, gets a tiny squish as the motor is final tightened.

Didn't notice it earlier, but the IACV to TB gasket part # is 22659AA120

All rebuilt for under $13 :-)
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Old 07-25-2013, 10:18 PM   #46
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Cleaned my IACV about a month and a half ago. Great write up. I took mine apart and soaked it in gasoline for an hour and then used carb cleaner to clean out the cracks. Came out spotless. I also noticed that the old gasket was thicker and expanded compared to a fresh new one.

When reinstalling the motor onto the valve housing, make sure to seat it properly!!! I did it wrong the first time and was idling erratically lol.

Here are my pics:

Old gasket on the left, new on the right. Pretty evident the difference in thickness. Coolant would leak past the fat gasket and would see white smoke out my tailpipe.


Built up carbon & gunk (250k worth!)


Taking a bath...


Out squeaky clean!

Last edited by KitchenerWRX; 09-06-2013 at 11:42 AM.
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Old 08-05-2013, 03:24 PM   #47
shamrock 05
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Quote:
Originally Posted by KitchenerWRX View Post
Cleaned my IACV about a month and a half ago. Great write up. I took mine apart and soaked it in gasoline for an hour and then used PB blaster to clean out the cracks. Came out spotless. I also noticed that the old gasket was thicker and expanded compared to a fresh new one.

When reinstalling the motor onto the valve housing, make sure to seat it properly!!! I did it wrong the first time and was idling erratically lol.

Here are my pics:

Old gasket on the left, new on the right. Pretty evident the difference in thickness. Coolant would leak past the fat gasket and would see white smoke out my tailpipe.


Built up carbon & gunk (250k worth!)


Taking a bath...


Out squeaky clean!


Did you leave the magnet attached while it was soaking in the gas?

I have 141K on my wrx and I dont think this is a problem but I was wondering..... when I start my car in the morning, why do the rpms jump up to about 1500-1700, then settle down to 500ish rpm? I dont understand why they go so high upon start up...
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Old 08-05-2013, 03:37 PM   #48
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They go up that high because of The tune, its normal. Its called the warm up enrichment cycle, as the engine temp increases it lowers in steps until normal operating temp is reached and it settles to 700 rpm.
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Old 12-16-2013, 02:34 PM   #49
WRXmeinMD
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Have mine soaking now! New gasket waiting to go in....
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Old 12-18-2013, 01:58 PM   #50
MAJRMSA
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Good info on here. I change the gasket and clean the IACV every 15k miles along with the fuel filter. I use the fuel from the old filter to soak the IACV. For me I find that gasoline cleans it much better.
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