Cleaning And Reattaching The IACV (Idle Air Control Valve) - Page 5

scooterforever · 07-14-2007, 02:51 PM

Quote:

Originally Posted by AVATAR-X

Also, anyone know what the part number is for the IAC valve.

You could try cleaning it again, but sometimes they just go bad. You can get the parts number from subaruparts.com, but you'll need to register (free). You can get 'young' IACVs by buying complete throttle bodies off car-part.com, I've seen them go for $100 or less, and you get a spare TB in the process.

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AVATAR-X · 07-14-2007, 03:31 PM

Quote:

Originally Posted by scooterforever

You could try cleaning it again, but sometimes they just go bad. You can get the parts number from subaruparts.com, but you'll need to register (free). You can get 'young' IACVs by buying complete throttle bodies off car-part.com, I've seen them go for $100 or less, and you get a spare TB in the process.

My question is this, it is now worse after cleaning it than it was before. Now it actually throws a code P1507, where before it just had some cold start/idle issues.

So, is it more likely that we broke it by removing/cleaning it, or did we somehow not seat it properly/tightly enough? Did we need to go and drive it more to be seated correctly, get it on boost or something (we just did off-boost driving). Or is it something else - is there some procedure for "resetting" after having unplugged it we kinda did the priming thing that was mentioned, though we might not have given it as much time as called for in the instructions.

Hmm... I wonder if I can find a test procedure for the IAC somewhere - I thought I saw some reference to using a volt-meter.

Metallrulz · 07-15-2007, 11:34 AM

The easiest way to take off the IACV's screws is with an impact screwdriver, like this:

Just use a flat head bit and it comes off in seconds and doesn't mess up the screw heads.

rick-l · 07-15-2007, 12:37 PM

Quote:

Originally Posted by OLO

SWEET!! I have been having the same issdue, high idle of 1500RPM in slow traffic and hot weather. I will give this a try also. Thanks for the great advice.

Did cleaning your IACV fix this?

jc54 wrc · 07-16-2007, 12:41 PM

Quote:

Originally Posted by WRX_REED

I know this thread is a bit old but has anyone tried using RTV silicon in place of the rubber gasket in small amounts so no swished out silicon falls into the intake chamber?

Out of desperation, I tried that, but the RTV didn't keep the coolant out. On the second try, I used a small amount of RTV and fashioned my own gasket with rubber gasket paper, and I still don't think it's keeping the coolant out. I know it already got a little coolant into the intake, so I let it run to burn that off, but the amount it's burning off makes me think the new gasket isn't secure.

Now that I know the gasket is cheap to replace (and now that I know where to find it), I think that's the best way to go.

subywrxtuner6969 · 07-23-2007, 09:53 AM

That was a awesome write up, it really helped

TurboRex · 07-24-2007, 03:06 PM

I have an 04 sti with a big maf intake (perrin). The car idles rough at times and is becoming harder to start. It also dies most of the time if you push in the clutch when slowing down from the freeway (or at a speed of around 40mph or so). If you rev the motor or hold it at a high speed when just sitting there, it will not die.

My iacv appears different than the picture noted earlier (assuming due to the DBW). The dealer noted there is an IACV gasket for my car but I am not sure. Anyone know about the sti and/or what could be my problem?

Thanks,

Greg

NewShockerGuy · 07-25-2007, 11:59 AM

Quote:

Originally Posted by TurboRex

I have an 04 sti with a big maf intake (perrin). The car idles rough at times and is becoming harder to start. It also dies most of the time if you push in the clutch when slowing down from the freeway (or at a speed of around 40mph or so). If you rev the motor or hold it at a high speed when just sitting there, it will not die.

My iacv appears different than the picture noted earlier (assuming due to the DBW). The dealer noted there is an IACV gasket for my car but I am not sure. Anyone know about the sti and/or what could be my problem?

Thanks,

Greg

Same boat as you Greg!

Bumping up to see if anyone can help...

-nigel

veilside5 · 08-04-2007, 03:11 PM

Many thanks for this DIY thread!! Sorry about bringing an old thread alive but I'm having some questions.

I own a 02 WRX and when I shift, my RPM goes up (between 200-500RPM). I'm sure that it's not because I press the gas pedal, it's really something else. I'm 100% stock. Some people told me it could be the IACV that was dirty. So I cleaned it all, but it still doing the same thing. My idle is fine...

What do you guys think??? (And please rep me, I can't start a new thread

)

veilside5 · 08-07-2007, 04:48 PM

ttt anyone??

prez04tswag · 08-12-2007, 10:47 PM

Can anyone help me locate the IAC valve on an '04 impreza ts wagon? It doesn't seem to be on top of the TB as shown in these photos.

MK19 · 08-14-2007, 08:37 PM

First off- tested the harness going to the IACV and it checks out per Subaru specs. If you want to see the manual for that troubleshooting the IACV, click here (right click, save as...) and search the PDF for Idle Air Control Solenoid. I didn't check the ECU connections yet, but if I am getting good power and the correct resistance at the IACV, odds are the ECU connections are ok- but I will check them just the same. I am going to clean the IACV yet AGAIN, this time by soaking it in SeaFoam and using Q-tips after. Has anyone ever disassembled the valve? I may bite the bullet tonight and do that.

txl146 · 08-22-2007, 09:19 PM

Thanks for the post. I will be receiving a gasket this Friday and try to clean the IAC.

txl146 · 08-24-2007, 09:49 PM

I cleaned it out today with MAF cleaner. Also replaced a gasket.

MK19 · 08-25-2007, 12:00 PM

Followed Subaru's technique- no change... Tried to test the neutral position switch and it seems out of range. Replacing it next.

20SUBIEWRX02 · 09-01-2007, 03:21 PM

hey guys i have a problem with my rpms. smetimes when i start my car it will start up normal and then just die and one day i started it three time till i got to the poit i had to keep the rpms up for like 3 or 4 sec before it would stay on and oneday it was high like in the 2000 rpm range so i was just wondering if that would be the IACV

superhawk44 · 09-01-2007, 05:58 PM

Quote:

Originally Posted by 20SUBIEWRX02

hey guys i have a problem with my rpms. smetimes when i start my car it will start up normal and then just die and one day i started it three time till i got to the poit i had to keep the rpms up for like 3 or 4 sec before it would stay on and oneday it was high like in the 2000 rpm range so i was just wondering if that would be the IACV

QUE?

20SUBIEWRX02 · 09-03-2007, 09:38 PM

what superhawk

triguy · 09-05-2007, 12:42 AM

Did this service recently. Instructions were helpful. I did have to remove the throttle body to get the vice grips on the IACV screw closest to the intake maniflod. A screw driver wasn't enough to loosen it. Once I got the vice grips on it, it loosened right up. I replaced the screws with the allen head bolts recommended. I cleaned the IACV using a spray bicycle chain degreaser that doesn't affect plastic parts. Followed the instructions on the install of the new gasket and break in and everything went fine.

fantomas · 09-05-2007, 12:30 PM

Quote:

Originally Posted by 20SUBIEWRX02

hey guys i have a problem with my rpms. smetimes when i start my car it will start up normal and then just die and one day i started it three time till i got to the poit i had to keep the rpms up for like 3 or 4 sec before it would stay on and oneday it was high like in the 2000 rpm range so i was just wondering if that would be the IACV

How many miles are on the car? could be the IACV or a cam sensor. any check engine lights?

fastlanerex · 09-10-2007, 08:18 PM

Quote:

Originally Posted by overdose

this gasket and it's proper replacement is BY FAR one of the most irritating features of the WRX, thank GOD my sti is dbw!

drive by wires suck you get real ****ty throttle response

superhawk44 · 09-10-2007, 10:24 PM

I used to think the same thing.

20SUBIEWRX02 · 09-11-2007, 12:21 PM

Quote:

Originally Posted by fantomas

How many miles are on the car? could be the IACV or a cam sensor. any check engine lights?

I have a check engine light and i looked at it and it said that my cat sensor was in the wrong place so i am getting a o2 harness so i can put it in the right spot. so i think that is why my check engine light is on but ill check it again. and what is the cam sensor and where is it located so i can check it out.

scooterforever · 09-14-2007, 09:16 AM

I finally had enough. My idle was starting to go again, and after cleaning the IACV about 4 times, it was ceasing to have a positive impact. So...

I just installed a brand new IACV. Idle is perfect. Expensive, but at least cleaning bought me about 2 years of extra life to the controller.

Tonight I am installing a catch can to try to reduce oil vapor through the IACV.

distorto · 09-14-2007, 01:58 PM

i did the coolant bypass mod and the next day i got a cel for the IACV. should i reconnect the coolant line or just clean the IACV?

09-03-2007, 09:38 PM	#118
20SUBIEWRX02 Scooby Newbie Member#: 153112 Join Date: Jul 2007 Chapter/Region: MWSOC Location: Aurora Vehicle: 2006 STI Black	what superhawk Last edited by 20SUBIEWRX02; 09-03-2007 at 09:39 PM. Reason: wrong

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07-15-2007, 11:34 AM	#103
Metallrulz Scooby Newbie Member#: 100148 Join Date: Nov 2005 Chapter/Region: Tri-State Location: South Jersey Vehicle: 2003 WRX Wagon Silver	The easiest way to take off the IACV's screws is with an impact screwdriver, like this: Just use a flat head bit and it comes off in seconds and doesn't mess up the screw heads.

07-23-2007, 09:53 AM	#106
subywrxtuner6969 * Banned * Member#: 119526 Join Date: Jul 2006 Chapter/Region: MAIC Location: West Virginia Vehicle: 2002 WRX Silver	That was a awesome write up, it really helped

07-24-2007, 03:06 PM	#107
TurboRex Scooby Specialist Member#: 8635 Join Date: Jul 2001 Location: Texas Vehicle: 04 STI, 07 FXT	I have an 04 sti with a big maf intake (perrin). The car idles rough at times and is becoming harder to start. It also dies most of the time if you push in the clutch when slowing down from the freeway (or at a speed of around 40mph or so). If you rev the motor or hold it at a high speed when just sitting there, it will not die. My iacv appears different than the picture noted earlier (assuming due to the DBW). The dealer noted there is an IACV gasket for my car but I am not sure. Anyone know about the sti and/or what could be my problem? Thanks, Greg

08-04-2007, 03:11 PM	#109
veilside5 Scooby Newbie Member#: 153972 Join Date: Jul 2007	Many thanks for this DIY thread!! Sorry about bringing an old thread alive but I'm having some questions. I own a 02 WRX and when I shift, my RPM goes up (between 200-500RPM). I'm sure that it's not because I press the gas pedal, it's really something else. I'm 100% stock. Some people told me it could be the IACV that was dirty. So I cleaned it all, but it still doing the same thing. My idle is fine... What do you guys think??? (And please rep me, I can't start a new thread )

08-07-2007, 04:48 PM	#110
veilside5 Scooby Newbie Member#: 153972 Join Date: Jul 2007	ttt anyone??

08-12-2007, 10:47 PM	#111
prez04tswag Scooby Newbie Member#: 156476 Join Date: Aug 2007	Can anyone help me locate the IAC valve on an '04 impreza ts wagon? It doesn't seem to be on top of the TB as shown in these photos.

08-14-2007, 08:37 PM	#112
MK19 Scooby Specialist Member#: 21977 Join Date: Jul 2002 Chapter/Region: NWIC Location: Quilcene, WA Vehicle: 2002 WRX Wagon Blue (again)	First off- tested the harness going to the IACV and it checks out per Subaru specs. If you want to see the manual for that troubleshooting the IACV, click here (right click, save as...) and search the PDF for Idle Air Control Solenoid. I didn't check the ECU connections yet, but if I am getting good power and the correct resistance at the IACV, odds are the ECU connections are ok- but I will check them just the same. I am going to clean the IACV yet AGAIN, this time by soaking it in SeaFoam and using Q-tips after. Has anyone ever disassembled the valve? I may bite the bullet tonight and do that.

08-22-2007, 09:19 PM	#113
txl146 Scooby Guru Member#: 32459 Join Date: Feb 2003 Chapter/Region: Tri-State Location: NY Vehicle: 02 WRX VF34 (SOLD) Junior Tuned 301whp	Thanks for the post. I will be receiving a gasket this Friday and try to clean the IAC.

08-24-2007, 09:49 PM	#114
txl146 Scooby Guru Member#: 32459 Join Date: Feb 2003 Chapter/Region: Tri-State Location: NY Vehicle: 02 WRX VF34 (SOLD) Junior Tuned 301whp	I cleaned it out today with MAF cleaner. Also replaced a gasket.

08-25-2007, 12:00 PM	#115
MK19 Scooby Specialist Member#: 21977 Join Date: Jul 2002 Chapter/Region: NWIC Location: Quilcene, WA Vehicle: 2002 WRX Wagon Blue (again)	Followed Subaru's technique- no change... Tried to test the neutral position switch and it seems out of range. Replacing it next.

09-01-2007, 03:21 PM	#116
20SUBIEWRX02 Scooby Newbie Member#: 153112 Join Date: Jul 2007 Chapter/Region: MWSOC Location: Aurora Vehicle: 2006 STI Black	hey guys i have a problem with my rpms. smetimes when i start my car it will start up normal and then just die and one day i started it three time till i got to the poit i had to keep the rpms up for like 3 or 4 sec before it would stay on and oneday it was high like in the 2000 rpm range so i was just wondering if that would be the IACV

09-05-2007, 12:42 AM	#119
triguy Scooby Specialist Member#: 27109 Join Date: Oct 2002 Chapter/Region: SCIC Location: Carlsbad, CA Vehicle: 2002 WRX Wagon 2.5L Crawford, 6 spd	Did this service recently. Instructions were helpful. I did have to remove the throttle body to get the vice grips on the IACV screw closest to the intake maniflod. A screw driver wasn't enough to loosen it. Once I got the vice grips on it, it loosened right up. I replaced the screws with the allen head bolts recommended. I cleaned the IACV using a spray bicycle chain degreaser that doesn't affect plastic parts. Followed the instructions on the install of the new gasket and break in and everything went fine.

09-10-2007, 10:24 PM	#122
superhawk44 Scooby Specialist Member#: 20264 Join Date: Jun 2002 Chapter/Region: NESIC Location: not homeless Vehicle: 05 LGT arrestmered 07 Aprilia Tuono	I used to think the same thing.

09-14-2007, 09:16 AM	#124
scooterforever Scooby Specialist Member#: 55011 Join Date: Feb 2004 Location: New England Vehicle: 1999 Legacy Outback	I finally had enough. My idle was starting to go again, and after cleaning the IACV about 4 times, it was ceasing to have a positive impact. So... I just installed a brand new IACV. Idle is perfect. Expensive, but at least cleaning bought me about 2 years of extra life to the controller. Tonight I am installing a catch can to try to reduce oil vapor through the IACV.

09-14-2007, 01:58 PM	#125
distorto Top Scoob 024 Member#: 56364 Join Date: Mar 2004 Chapter/Region: International Location: houston, texas Vehicle: RIP stompr :( bagged vulvva	i did the coolant bypass mod and the next day i got a cel for the IACV. should i reconnect the coolant line or just clean the IACV?