The Subaru SVX World Network   SVX Network Forums
Live Chat!
SVX or Subaru Links
Old Lockers
Photo Post
How-To Documents
Message Archive
SVX Shop Search
IRC users:

Go Back   The Subaru SVX World Network > SVX Main Forums > Technical Q & A

Reply
 
Thread Tools Display Modes
  #1  
Old 10-19-2006, 04:38 PM
SVXdc's Avatar
SVXdc SVXdc is offline
Radio wiring harness guru
Subaru Gold Contributor
 
Join Date: Oct 2002
Location: Atlanta, GA
Posts: 615
Significant Technical Input Registered SVX
Question Engine stalling, need new "Auxilliary Idle Control Valve"?

A couple of nights ago, my '96 started stalling if I did not keep the revs above ~1000rpm. In order to crank it, I had to keep my foot on the gas.

I read the ECU [correction: TCU] fault code (using the shift D/3/2/1 manu-button technique) and got code 23 "Engine Revolution Sensor".

Does anyone have any further information about this fault?

I've taken it to a Subaru dealer, and they've determined that I need a new "Auxilliary Idle Control Valve" for about $244 plus 2hrs labor.

I tried looking up the part number they gave me (14467AA02A) on SubaruParts.com, but can't find it.

This thread started by Landshark from a few years back talks about the "auxilliary idle air control valve". Is that the same part? Beav said it should only need to be cleaned, not replaced. That fix would sure make me $244 happier.
__________________
David C.
1996 Laguna Blue Pearl SVX L AWD
See my home page for SVX radio install/removal instructions and wiring harnesses

Last edited by SVXdc; 10-19-2006 at 04:57 PM.
Reply With Quote
  #2  
Old 10-19-2006, 04:47 PM
Earthworm's Avatar
Earthworm Earthworm is offline
Meow!
 
Join Date: Mar 2002
Location: Winnipeg, Manitoba
Posts: 11,957
Send a message via ICQ to Earthworm Send a message via AIM to Earthworm Send a message via MSN to Earthworm Send a message via Yahoo to Earthworm Send a message via Skype™ to Earthworm
You scanned the TCU fault code...not the ECU code. Does the check engine light come on or stay on? Find someone with an OBD-II reader to confirm and engine codes.
Reply With Quote
  #3  
Old 10-19-2006, 04:55 PM
SVXdc's Avatar
SVXdc SVXdc is offline
Radio wiring harness guru
Subaru Gold Contributor
 
Join Date: Oct 2002
Location: Atlanta, GA
Posts: 615
Significant Technical Input Registered SVX
The "check engine" light did not stay on. I think it came on while the engine was stalled -- it seemed to be the normal mode for when you turn the key to "on" but have not cranked the engine, where most of the dash indicators light up.

The dealer did use an ODBII scanner. The error message was slightly different than the above, but similar (I don't remember the exact wording it showed). It was still somewhat non-specific as to the cause.
__________________
David C.
1996 Laguna Blue Pearl SVX L AWD
See my home page for SVX radio install/removal instructions and wiring harnesses
Reply With Quote
  #4  
Old 10-19-2006, 06:13 PM
svx_commuter's Avatar
svx_commuter svx_commuter is offline
Making tires round, Six now :)
 
Join Date: Feb 2001
Location: North Jersey
Posts: 3,433
Cleaning the throttle body comes to mind. I think you don't have any codes to care about. The CE would be on if a sensor failed or misfired occured for OBDII.
__________________
May your transmission live forever.
SuperbVehicleXtraordinary
Proud sponsor of a 1992 SVX.
Reply With Quote
  #5  
Old 10-19-2006, 07:32 PM
SVXRide's Avatar
SVXRide SVXRide is offline
Official AutoX Part Breaker
Subaru Gold Contributor
 
Join Date: Aug 2002
Location: Midlothian, VA 23112
Posts: 8,138
Registered SVX
Beav's got it right! Pull the TB off and then pull the AICV off the bottom of it. Clean both with TB cleaner, let dry, and reinstall
-Bill
__________________
Retired NASA Rocket Scientist

Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023

Center Network Member #989

'92 Fully caged, 5 speed, waiting for its fully built EG33
'92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension
'92(?) Laguna, 6 spd and other stuff (still at OT's place)
My Locker
Reply With Quote
  #6  
Old 10-19-2006, 08:00 PM
oab_au oab_au is offline
Registered User
Subaru Gold Contributor
 
Join Date: Mar 2001
Location: Coffs Harb, Australia.
Posts: 5,032
Significant Technical Input Registered SVX
Quote:
Originally Posted by SVXRide
Beav's got it right! Pull the TB off and then pull the AICV off the bottom of it. Clean both with TB cleaner, let dry, and reinstall
-Bill
Bill that is fine for the Idle Air Control Valve, but it is the Auxiliary Air Valve that is the problem. It is under the left hand, rear of inlet manifold. The inlet hose, to the AAV, runs off the left hand side of the air box that connects to the throttle bodies. If you pull the hose off the air box, you should be able to blow through it when the engine is cold. If you can't, the valve is stuck. Spray some carb cleaner into the AAV to unstuck it.

Harvey.
__________________
One Arm Bloke.
Tell it like it is!

95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels.
97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
Reply With Quote
  #7  
Old 10-19-2006, 08:09 PM
SVXRide's Avatar
SVXRide SVXRide is offline
Official AutoX Part Breaker
Subaru Gold Contributor
 
Join Date: Aug 2002
Location: Midlothian, VA 23112
Posts: 8,138
Registered SVX
Quote:
Originally Posted by oab_au
Bill that is fine for the Idle Air Control Valve, but it is the Auxiliary Air Valve that is the problem. It is under the left hand, rear of inlet manifold. The inlet hose, to the AAV, runs off the left hand side of the air box that connects to the throttle bodies. If you pull the hose off the air box, you should be able to blow through it when the engine is cold. If you can't, the valve is stuck. Spray some carb cleaner into the AAV to unstuck it.

Harvey.

D'oh! I've got to get more sleep before posting
-Bill
__________________
Retired NASA Rocket Scientist

Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023

Center Network Member #989

'92 Fully caged, 5 speed, waiting for its fully built EG33
'92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension
'92(?) Laguna, 6 spd and other stuff (still at OT's place)
My Locker
Reply With Quote
  #8  
Old 10-19-2006, 11:09 PM
SVXdc's Avatar
SVXdc SVXdc is offline
Radio wiring harness guru
Subaru Gold Contributor
 
Join Date: Oct 2002
Location: Atlanta, GA
Posts: 615
Significant Technical Input Registered SVX
Quote:
Originally Posted by oab_au
... it is the Auxiliary Air Valve that is the problem. It is under the left hand, rear of inlet manifold. The inlet hose, to the AAV, runs off the left hand side of the air box that connects to the throttle bodies. ...
I have not been able to find a diagram that shows the Aux. Air Valve.

But in this diagram...

http://www.subaruparts.com/subaru.diag/2A/i073A-1.gif

(the "Air duct" diagram, showing the "Boot-air intake")

Is the inlet hose to the AAV that you are talking about the hose labeled H512191 or the short tube labeled "refer to fig. 82A" ?
__________________
David C.
1996 Laguna Blue Pearl SVX L AWD
See my home page for SVX radio install/removal instructions and wiring harnesses
Reply With Quote
  #9  
Old 10-20-2006, 09:34 AM
billb billb is offline
Registered User
 
Join Date: Sep 2004
Location: Akron, OH
Posts: 165
If you look in my locker you will see a writeup on the Aux. Air Valve and the Idle air control valve (usually called the IAC). There's a lot of photos there too. It explains the valves, where they are and how to clean them. Briefly, the Aux. air valve is only open when the car is cold. It allows extra air in while the engine is cold. After the car warms up, it closes down. As it closes, the idle speed drops. When the valve has completely closed, the engine should idle at 610 rpm.

If your problem is only when the engine is cold, it could be the Aux. air valve.

The IAC holds the engine idle at 610 rpm after warmup. It can get gunked up and be cleaned.

http://www.subaruparts.com/subaru.diag/2A/i073A-1.gif
The diagram you referenced above doesn't show either one of these valves.
__________________
Bill
94 SVX LE 130,000mi
Reply With Quote
  #10  
Old 10-20-2006, 09:37 AM
SVXdc's Avatar
SVXdc SVXdc is offline
Radio wiring harness guru
Subaru Gold Contributor
 
Join Date: Oct 2002
Location: Atlanta, GA
Posts: 615
Significant Technical Input Registered SVX
Found the correct diagram and the part the dealer said I need to replace...

Image: http://www.subaruparts.com/subaru.diag/2/i036-A.gif

Page on SubaruParts.com, category 036A-1 "Water Pipe (1)" (now requires registration/login)

Part number 14467 "Valve assembly-auxiliary air" $110.76

Although the diagram for the 92 is slightly different, the same part is listed there too.

I don't see how this aux. valve could be causing my stalling problem. After re-reading Jason's post in the "Confused" thread, it sounds like the 'primary' valve is more likely the culprit. Can any other experts confirm?

Added: Problem persisted even after engine was hot.
__________________
David C.
1996 Laguna Blue Pearl SVX L AWD
See my home page for SVX radio install/removal instructions and wiring harnesses
Reply With Quote
  #11  
Old 10-20-2006, 09:38 AM
billb billb is offline
Registered User
 
Join Date: Sep 2004
Location: Akron, OH
Posts: 165
Quote:
Originally Posted by SVXdc
I have not been able to find a diagram that shows the Aux. Air Valve.

But in this diagram...

http://www.subaruparts.com/subaru.diag/2A/i073A-1.gif

(the "Air duct" diagram, showing the "Boot-air intake")

Is the inlet hose to the AAV that you are talking about the hose labeled H512191 or the short tube labeled "refer to fig. 82A" ?
Nope. It comes off of the other one, where it says Fig. 36.
__________________
Bill
94 SVX LE 130,000mi
Reply With Quote
  #12  
Old 10-20-2006, 10:14 AM
SVXdc's Avatar
SVXdc SVXdc is offline
Radio wiring harness guru
Subaru Gold Contributor
 
Join Date: Oct 2002
Location: Atlanta, GA
Posts: 615
Significant Technical Input Registered SVX
Quote:
Originally Posted by billb
Quote:
Originally Posted by SVXdc
Is the inlet hose to the AAV that you are talking about the hose labeled H512191 or the short tube labeled "refer to fig. 82A" ?
Nope. It comes off of the other one, where it says Fig. 36.
Thanks. After I finally found diagram 36 I figured that out.

Quote:
If you look in my locker you will see a writeup on the Aux. Air Valve and the Idle air control valve (usually called the IAC).
Ah! I hadn't noticed the Word doc before. That helped a lot. Wish I had found that before I went to the dealer.

One question I still have: Where does the inlet hose to the (primary) Idle Air Control Valve come from? I'm not seeing any stubs for it on the "Air Intake Boot" page (fig. 073A), or the "Air Intake" page (fig. 071K).
__________________
David C.
1996 Laguna Blue Pearl SVX L AWD
See my home page for SVX radio install/removal instructions and wiring harnesses

Last edited by SVXdc; 10-20-2006 at 10:35 AM.
Reply With Quote
  #13  
Old 10-20-2006, 10:43 AM
billb billb is offline
Registered User
 
Join Date: Sep 2004
Location: Akron, OH
Posts: 165
Quote:
Originally Posted by SVXdc

One question I still have: Where does the inlet hose to the (primary) Idle Air Control Valve come from? I'm not seeing any stubs for it on the "Air Intake Boot" page (fig. 073A), or the "Air Intake" page (fig. 071K).
Look at my photo 10 for a picture of the tube attached to the IAC valve. The open end of that tube can be reached by standing on the passenger side of the car and reaching down between the main air intake tube and the firewall. It stubs off of the air tube back there. I didn't take a photo of it in the car because you can't really see it very well.
__________________
Bill
94 SVX LE 130,000mi
Reply With Quote
  #14  
Old 10-20-2006, 11:09 AM
SVXdc's Avatar
SVXdc SVXdc is offline
Radio wiring harness guru
Subaru Gold Contributor
 
Join Date: Oct 2002
Location: Atlanta, GA
Posts: 615
Significant Technical Input Registered SVX
Quote:
Originally Posted by billb
... [from the] passenger side of the car [reach] down between the main air intake tube and the firewall. It stubs off of the air tube back there. ...
That helped -- I looked more closely at the Air Duct diagram (073A) and noticed the "Refer to Fig. 050A" above the Air Boot. Figure 50, "Intake Manifold," shows the hose flying in space (and the hose has no connection with the parts on figure 50 otherwise).
__________________
David C.
1996 Laguna Blue Pearl SVX L AWD
See my home page for SVX radio install/removal instructions and wiring harnesses
Reply With Quote
  #15  
Old 10-20-2006, 12:12 PM
cdigerlando cdigerlando is offline
Registered User
 
Join Date: Feb 2001
Location: Longwood, FL
Posts: 1,422
Aac

When you find it, try cleaning it up again before buying a new one. There is not much too this part to go wrong. It does seem like that is what the problem is with the car from the symtoms you decribe.
__________________
Chuck D.
1992 Subaru SVX LS-L - Heavily modded turbo
2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 03:54 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
© 2001-2015 SVX World Network
(208)-906-1122