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Old 11-17-2009, 01:29 PM   #301
WRXerist
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2006 FX45
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My car does has a similar issue... It would start up fine and drives fine. When cold and when it hasn't been started for a couple of days, when starting it, it would make this struggling sound but it starts. You guys think it might be a dirty IAVC? Or do I need to clean the upper engine mount with the Subaru Upper Engine Cleaner?

The car has 88K miles. Just put in new plugs (NGK OEM).
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Old 02-08-2010, 04:15 PM   #302
miguel muņiz
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I have a Forester XT 2004 and the cel P0509 appears and is something about the IAC but I cant find the IAC in my forester does anyone know where it is??? I think I have the same throttle of the STI 04-up
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Old 02-15-2010, 10:32 PM   #303
ukranianization
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2003 wrx
Psm

Talking wow

this thread just saved me.thanks a bunch.
i also have a cylinder misfire, does anyone know if that could be a result of a bad iacv gasket?
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Old 02-17-2010, 03:33 PM   #304
mysticmicman
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Hey can anyone tell me what the other black box'ed item is on the left side of the IAVC? Mine has a crack down the side of it (Not the black box but the metal itself!) and i have no clue what it is and i want to find out what it is so i can replace it. Thanks
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Old 02-18-2010, 10:27 AM   #305
AWDBoost
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03 IMPREZA
under the Knife

Default Thank you!

I have 141K on my WRX and for the past 3 weeks Ive had my Idle surge on cold start up as well..

The Good ol' search button worked once again! Bought a new gasket and cleaned the IACV .. Idle surge is GONE!

Thank you OP !
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Old 02-23-2010, 07:17 PM   #306
97legwagon
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I cleaned the IAC valve on my EJ22T and it made a very slight difference. I have a feeling that I will to replace it sooner or later. Just have to keep an eye on the check engine light and hopefully the CEL stays away!
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Old 02-23-2010, 11:16 PM   #307
txl146
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you guys will be surprised at how much more gunk is below the shaft after you disassemble the whole unit. I spent an hour thoroughly cleaning the IACV, but was shocked to find out only about 1/2 of gunk was removed after disassembling the unit. You will need to use a grinder in order to be able to remove two bolts.
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Old 03-26-2010, 05:54 PM   #308
WrxRD87
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Good write up! I followed all of the advice and techniques on this write-up and successfully replaced my IACV on my 02 WRX. Replaced it, left battery cable unhooked for about 15 minutes and check engine light has not come back on Originally received P1507 code for this problem.
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Old 05-03-2010, 12:28 PM   #309
highmtn
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Really helpful! I followed the write up, took about an hour and saved $400. ('02 WRX)
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Old 05-08-2010, 11:47 AM   #310
nelam
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great write up and even easier fix on an 01 2.5rs. went the gasoline route. saved a few hundred bucks and the car is so much smoother. no more p1507 either. thanks very much OP.
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Old 05-22-2010, 06:38 AM   #311
Evilchargerfan
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looks like i got a hot date next weekend w/ some q-tips and alcohol (perhaps more than 1 type )
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Old 05-23-2010, 12:37 AM   #312
txl146
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make sure to disassemble the WHOLE unit....
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Old 06-02-2010, 11:56 PM   #313
wrxmonster
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Quote:
Originally Posted by txl146 View Post
make sure to disassemble the WHOLE unit....
Dam I should have done this!!!
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Old 06-03-2010, 12:23 PM   #314
rick-l
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Quote:
Originally Posted by txl146 View Post
make sure to disassemble the WHOLE unit....
I am not sure if you do more disassembly than take it off the intake manifold it will go back together.
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Old 06-14-2010, 02:25 PM   #315
Agkelos
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For anyone who doesn't have access to an impact to remove the screws, I was able to remove them with the large screwdriver method. It needs to be wider than the diameter of the screw head and also large enough to completely fill the gap in the screw (meaning no wiggle room for the driver). Also, one was really stuck so I attached vice grips to the shaft of the driver and cranked with my left hand while pushing the driver down hard with my right. This was on a 2002 with 107k and the IAC has never been removed.


Hope that helps.
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Old 07-16-2010, 04:06 PM   #316
DCrally43
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i drove all the way to the dealership today and bought their last IACV gasket, ready to do this but now im hung up on the bolts. their 5mm? thats a very odd size, what about the thread pitch?
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Old 07-17-2010, 04:30 PM   #317
rick-l
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Quote:
Originally Posted by DCrally43 View Post
i drove all the way to the dealership today and bought their last IACV gasket, ready to do this but now im hung up on the bolts. their 5mm? thats a very odd size, what about the thread pitch?
If you get the impact driver you won't need new screws.

http://www.sears.com/shc/s/p_10153_1...o=4&blockType=
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Old 07-23-2010, 08:16 PM   #318
Doroshujin
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Default Where is my IACV?

I really hope I'm not being retarded but I can't find the IACV. My throttle body looks different than all the write ups. Can you help pic it out of this picture? Thanks

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Old 07-23-2010, 09:59 PM   #319
mostasz
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What year and model do you drive?
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Old 07-27-2010, 05:17 PM   #320
Flyke
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Quote:
Originally Posted by Doroshujin View Post
I really hope I'm not being retarded but I can't find the IACV. My throttle body looks different than all the write ups. Can you help pic it out of this picture? Thanks
It's the one with the blue label.

//Flyke
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Old 07-30-2010, 12:53 PM   #321
elchupanigre
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just cleaned mine out today. took about 30 mins. great heads up on the flathead.
no surge, no freaking 3500 idle out of no where, and when the scoob is warm steadies at about 800 not 500-1200
thumbs thumbs thumbs up
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Old 07-31-2010, 11:25 AM   #322
wrx720
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Hey guys, I'm new to nosioc, How you guys doin? I been having problems with my icv for a while, I just figure out how to fix this culprit, I know how frustrated this can be. I want to share this with you guys.
when you guys take motor and housing apart, make sure you clean it good, I mean really good. especially the top and bottom part where the bearing is. when you can move the flap and bounce back, you getting close. I cleaned my so good that it instant close back , when you pick it.
I used wd40 to clean and lube, now putting the housing and motor, make sure the flap is fully closed, you can adjust the two 5 star screws to line up, doesn't have to be straight. pay close attention to the mounting hole, it can be adjust. good luck!
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Old 07-31-2010, 07:00 PM   #323
dwmoss_68
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07 WRB FXT Sport

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Just wanted to say thanks to this thread and images.

02 wrx wagon
205k

returned from a 2 week vacation (took the fxt, so the wrx sat)
returned and on the restart of the wrx p1507, and surging idle.

I had purchased 2 iacv gaskets a couple of years ago (thinking ahead thanks to this thread again)

I cleaned up the top half as in the first post, i didn't get it anywhere as clean as the rest of you im sure. 205k of miles there was lot's of build up. Just put back on and no more p1507, idle is good. I really think I need to do a better job cleaning it out. But i'll open it up and do it again if I need to.

thanks again

I'll add i plan to do the iacv cleaning as listed in endwrench as well tomorrow. Throttle body cleaning.

dm

Last edited by dwmoss_68; 07-31-2010 at 07:08 PM.
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Old 08-01-2010, 11:43 AM   #324
03WRX83
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I did this cleaning process yesterday. I first cleaned my perrin intake filter after which i start the car and the p1507 cel comes on. I take apart the iacv and fallowing cleaning procedures with the alcohol and q tips. As far as my gasket goes it came off in one piece, ever so gently. And yes it expanded, and I did reuse it again. To get the gasket to shrink back down i actually put it into the freezer for the duration of the time it took me to clean the part. And just like that it worked putting back on. I sat the gasket in place, put the iac back on and wiggled it back and for to ensure gasket fitment. Screwed her back on and no leaks. Car idles better than ever.
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Old 08-12-2010, 09:21 PM   #325
anickode
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I just went through and did this today. It was starting up at 1200 like it always does, but instead of dropping to 500 very shortly after, it would quickly spike to 2000 rpm. Figured it must be the IACV. The entire inside of the thing was just filled with black gunk. I laid it on the work bench and filled it up with seafoam. 5 mins later, I wiped around inside it with a q tip, poured it out, and it was squeaky clean. Did it a second time just to be safe, then cleaned out the seafoam residue with MAF cleaner.

Put it back on, and presto. 500 rpm idle.

I love seafoam. For degunking parts, you absolutely cannot beat it.
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