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Old 05-05-2014, 02:59 PM   #1
Dr. octagon
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Member#: 171127
Join Date: Feb 2008
Chapter/Region: MAIC
Location: Union Station
Vehicle:
02 Kinugawa'ed
Rotated T67

Default Question on IACV Flapper Positon (asked in service...but hear crickets)

I believe my IACV is on its last leg.

What it does:

1. CEL P0507 (IAC rev high)
2. Sometimes the rev will hang at 2k on cold start and a few times at idle.
3.Have to rev up to 2000-2200 to not bogg down out of 1st gear
4.Sometimes CEL will stay on, but give no indication of an IACV issue...............then hours later kick back in with IACV rev issues. So yea, it comes and goes.

I have cleaned the IACV a couple times now, and the gasket is "okay"...not shot nor ripped but has expanded due to heat

Question:

I know the IACV flaper is not supposed to be stuck shut, and should move freely........but is it supposed to be 1/4 to 1/2 way open?

Mine is 1/4 to 1/2 way open.
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Old 05-06-2014, 10:06 AM   #2
Dr. octagon
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Join Date: Feb 2008
Chapter/Region: MAIC
Location: Union Station
Vehicle:
02 Kinugawa'ed
Rotated T67

Default

No one knows??????????
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Old 05-06-2014, 05:06 PM   #3
obrut
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Join Date: Nov 2003
Chapter/Region: MAIC
Location: NOVA
Vehicle:
04 STI JBP
HTA3586 5XX WHP 93oct

Default

sent you email with fsm diag's
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Old 05-07-2014, 10:08 AM   #4
rallyrab
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Join Date: Apr 2007
Chapter/Region: MAIC
Location: Ocean City AWD Meet
Default

2 things.....

My throttle body sat for a while and the flapper inside stuck shut. This made the car rev high and then it goes into limp mode. When you clean it out, make sure you are actually moving the flapper up and down to ensure it is not stuck open or closed. I sprayed card cleaner in there and let it sit and then used a q tip to clean it and move the flapper.

The second thing, and what may be your problem, you need to replace that gasket every time the IACV is off the throttle body. It expands from the heat and when you try to put it back on, its too big to fit. If you force it in, I promise you that it will leak.

Hope this helps!
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Old 05-07-2014, 10:10 AM   #5
rallyrab
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Chapter/Region: MAIC
Location: Ocean City AWD Meet
Default

And yes the flapper is supposed to be open. That is the only air inlet when the throttle body is shut.
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Old 05-07-2014, 10:19 AM   #6
simpsonsdotcom
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Join Date: Jan 2011
Location: Richmond, VA
Vehicle:
2002 2.5RS BRP
2004 WRX WRB

Default

I just had to replace mine. I cleaned it twice over the past to years to prolong it. I got a CEL and high revs.
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Old 05-07-2014, 10:20 AM   #7
rallyrab
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Default

OP, prolong it as far as possible. I think these things are like over $300 bucks lol
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Old 05-07-2014, 10:27 AM   #8
simpsonsdotcom
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2004 WRX WRB

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yeah $300+. I ordered mine from rockauto for $205, but the first one got to me defective. I sent it back, the second one is good.
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Old 05-07-2014, 01:37 PM   #9
Dr. octagon
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Member#: 171127
Join Date: Feb 2008
Chapter/Region: MAIC
Location: Union Station
Vehicle:
02 Kinugawa'ed
Rotated T67

Default

Quote:
Originally Posted by obrut View Post
sent you email with fsm diag's
Boss, thanks
Quote:
Originally Posted by rallyrab View Post
2 things.....

My throttle body sat for a while and the flapper inside stuck shut. This made the car rev high and then it goes into limp mode. When you clean it out, make sure you are actually moving the flapper up and down to ensure it is not stuck open or closed. I sprayed card cleaner in there and let it sit and then used a q tip to clean it and move the flapper.

The second thing, and what may be your problem, you need to replace that gasket every time the IACV is off the throttle body. It expands from the heat and when you try to put it back on, its too big to fit. If you force it in, I promise you that it will leak.

Hope this helps!
Yes after repeated cleanings it definatly has expanded

Quote:
Originally Posted by rallyrab View Post
And yes the flapper is supposed to be open. That is the only air inlet when the throttle body is shut.
Appreciate the insight

Quote:
Originally Posted by simpsonsdotcom View Post
I just had to replace mine. I cleaned it twice over the past to years to prolong it. I got a CEL and high revs.
I have cleaned mine about 4 times, on two seperate occasions about 4 years apart

Quote:
Originally Posted by rallyrab View Post
OP, prolong it as far as possible. I think these things are like over $300 bucks lol

Correct, i will buy a used one before i buy a new one
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Old 05-08-2014, 12:24 PM   #10
rallyrab
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Join Date: Apr 2007
Chapter/Region: MAIC
Location: Ocean City AWD Meet
Default

If you are reusing the old gasket, that will possibly make the car run the way it is and even throw the CEL. You need to get a new gasket before you buy another IACV.
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Old 05-08-2014, 05:13 PM   #11
Dr. octagon
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Member#: 171127
Join Date: Feb 2008
Chapter/Region: MAIC
Location: Union Station
Vehicle:
02 Kinugawa'ed
Rotated T67

Default

Quote:
Originally Posted by rallyrab View Post
If you are reusing the old gasket, that will possibly make the car run the way it is and even throw the CEL. You need to get a new gasket before you buy another IACV.

Correct.....amther taking the gasket out twice I knew it was done pretty much, I also noticed that it has expanded.

Hate these dealership aliens and their what's your vin.......and they won't have the gasket in stock.

Not sure what the **** they stock...or why they claim to have a stock room.
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Old 05-08-2014, 07:56 PM   #12
KONKILR
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Join Date: Dec 2000
Chapter/Region: MAIC
Location: Flintstone,md.
Vehicle:
2004 Impreza TS and
the Suxass racing mobile!

Default

They stock what sells. IACV gaskets are a rare part to be replacing. Only turbo cars of the early years have it, and the dealer hardly ever see's those cars. Turbo subaru's make up a small fraction of the business they do! And the VIN is neccesary so the parts person can get you the right part. The subaru parts catalog is a nightmare without a VIN. Without it you will never find what you need unless you know what exaclty every part number is. Plus subaru has the oddest names for the parts compared to other manufacturers.

jake
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Old 05-08-2014, 10:04 PM   #13
DavC825
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Location: Prince George's County
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07 Squeakmobile
Black in Color

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Quote:
Originally Posted by KONKILR View Post
They stock what sells. IACV gaskets are a rare part to be replacing. Only turbo cars of the early years have it, and the dealer hardly ever see's those cars. Turbo subaru's make up a small fraction of the business they do! And the VIN is neccesary so the parts person can get you the right part. The subaru parts catalog is a nightmare without a VIN. Without it you will never find what you need unless you know what exaclty every part number is. Plus subaru has the oddest names for the parts compared to other manufacturers. jake
And one of the worst labelers of wire color for electrical diagrams.
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Old 05-08-2014, 11:11 PM   #14
bluemax189
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Member#: 137405
Join Date: Jan 2007
Chapter/Region: MAIC
Location: Baltimore
Vehicle:
2011 WRX
20g

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Old 05-08-2014, 11:23 PM   #15
t3hWIT
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Member#: 58779
Join Date: Apr 2004
Chapter/Region: MAIC
Location: **** Town
Vehicle:
95 STi RA (rhd)
98 Tacoma (300k Club)

Default

Quote:
Originally Posted by Dr. octagon View Post

Not sure what the **** they stock...or why they claim to have a stock room.
As previously stated, dealerships stock what sells. If more than one or twit buys X-part, it becomes a stock item. If no one buys a certain item for 6-12 months, the part is called back or scrapped. Very rarely do these gaskets get replaced, so it's not reasonable to expect them to be sitting on a shelf waiting for you.
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Old 05-09-2014, 08:55 AM   #16
Dr. octagon
Scooby Specialist
 
Member#: 171127
Join Date: Feb 2008
Chapter/Region: MAIC
Location: Union Station
Vehicle:
02 Kinugawa'ed
Rotated T67

Default

Quote:
Originally Posted by KONKILR View Post
They stock what sells. IACV gaskets are a rare part to be replacing. Only turbo cars of the early years have it, and the dealer hardly ever see's those cars. Turbo subaru's make up a small fraction of the business they do! And the VIN is neccesary so the parts person can get you the right part. The subaru parts catalog is a nightmare without a VIN. Without it you will never find what you need unless you know what exaclty every part number is. Plus subaru has the oddest names for the parts compared to other manufacturers.

jake
Thanks

Quote:
Originally Posted by DavC825 View Post
And one of the worst labelers of wire color for electrical diagrams.
Quote:
Originally Posted by bluemax189 View Post
Quote:
Originally Posted by t3hWIT View Post
As previously stated, dealerships stock what sells. If more than one or twit buys X-part, it becomes a stock item. If no one buys a certain item for 6-12 months, the part is called back or scrapped. Very rarely do these gaskets get replaced, so it's not reasonable to expect them to be sitting on a shelf waiting for you.
thanks
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