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#1
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Checking Idle Air Control Valve
Hi again,
I'm pretty sure the IAC on mine needs cleaning out. It'd appear, since it sits on the underside of the Throttle Chamber, you have to remove the Throttle Chamber, so I've got gaskets (and some time) coming. Once I get to it, is there any way to test it ? Maybe run a voltage to one of its wires (I'm guessing it just moves a 'valve' to open outside air into the plenum) ? My car is a hard start when cold (no CE lights, no obvious vacuum leaks, and just did 02s). Once warm is no problem. Also, when cold the car shakes and RPM's drop - just like a carb'd car with no choke would do... I'm sure I need to get to it and attempt cleaning it out. I guess I just spray some Carb Cleaner in the main square hole on its top ? Maybe in a vacuum line ? Didn't notice anyway to get to the actual valve by looking at the pic on subaruparts.com Thanks for any advice on testing it ! |
#2
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Re: Checking Idle Air Control Valve
Quote:
i have the same symptoms - on freezing days when the car sits in the lot all day, it does what you said if i don't warm it up for a few minutes. i used to throw Cylinder#1 misfire codes if it was really cold out with no warm up. now i just make sure to warm it up before heading out, and its kind of a pain in the arse. i need to get it fixed real soon!
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Alan 1987 928 S4 (Black) SOLD! ![]() 1997 SVX LSi (Ebony) SOLD! ![]() 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! ![]() 1987 928 S4 (Black) SOLD! ![]() 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#3
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I cleaned mine out.
Yes, you have to remove the throttlebody from the intake manfold to clean it out.
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2005 Legacy GT 2002 WRX VF22, Pinks, big TMIC and turbo back 128,*** miles ![]() My WRX's Cardomain Page |
#4
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Quote:
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Alan 1987 928 S4 (Black) SOLD! ![]() 1997 SVX LSi (Ebony) SOLD! ![]() 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! ![]() 1987 928 S4 (Black) SOLD! ![]() 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#5
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An exploded diagram and info from the FSB indicate that an "auxiliary air-control valve" assists in the control of bypass air when the motor is cold, as opposed to the "bypass air control solenoid valve" which controls bypass air after the motor reaches operating temp. It appears the aacv is attached via vacuum hoses to the throttle body on one side and the intake plenum box on the other. I'd be sure those hoses aren't hiding a leak, then assure that the aacv is operating correctly. It's referred to as a " bi-metal coil-heater and rotary valve" presumably switching off as engine heat/coolant reach optimum.
The bacsv appears to be on the underside of the throttle body and would probably require r&r of both to clean. A Trouble code 24 appears associated with the bacsv troubleshooting. Have you pulled any trouble codes? Glenn
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"The only thing necessary for the triumph of evil is for good men to do nothing" Aaron Burke 1993 25th Anniversary Edition #63 of 301. R.I.P. Rojo 7/24/2008 She saved my life! 1997 Ebony Mica Pearl LSI. BLACKBERRY 1998 5-Spd Legacy GT Wagon in Glacier White: NUBURU 2005 Cadillac STS in Sandstorm Metallic: STORMY Veteran and farthest traveler of 1st SoCal2MuseumsMeet2010. http://www.subaru-svx.net/photos/user.php?RojoRocket |
#6
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Quote:
what, and where, is this "bypass air control solenoid valve"? Quote:
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Alan 1987 928 S4 (Black) SOLD! ![]() 1997 SVX LSi (Ebony) SOLD! ![]() 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! ![]() 1987 928 S4 (Black) SOLD! ![]() 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#7
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Alan, The bacsv is what I believe you're calling the iac, and is on the bottomside of the throttle body. It adjusts the idle in tandem with the aacv when cold and when warmed handles the chore alone. I can't tell you how much help it is to have the manuals.
I suppose, from what I've seen of the inside of the "collector" on my car, it could definitely do no harm to clean it up. Glenn
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"The only thing necessary for the triumph of evil is for good men to do nothing" Aaron Burke 1993 25th Anniversary Edition #63 of 301. R.I.P. Rojo 7/24/2008 She saved my life! 1997 Ebony Mica Pearl LSI. BLACKBERRY 1998 5-Spd Legacy GT Wagon in Glacier White: NUBURU 2005 Cadillac STS in Sandstorm Metallic: STORMY Veteran and farthest traveler of 1st SoCal2MuseumsMeet2010. http://www.subaru-svx.net/photos/user.php?RojoRocket |
#8
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Quote:
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#9
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Factory service manual or bulletin.
KuoH Quote:
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#10
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Sorry Rob! That would be FSM(Factory Service Manual) as I got a bit carried away with the abbreviations.
![]() Glenn
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"The only thing necessary for the triumph of evil is for good men to do nothing" Aaron Burke 1993 25th Anniversary Edition #63 of 301. R.I.P. Rojo 7/24/2008 She saved my life! 1997 Ebony Mica Pearl LSI. BLACKBERRY 1998 5-Spd Legacy GT Wagon in Glacier White: NUBURU 2005 Cadillac STS in Sandstorm Metallic: STORMY Veteran and farthest traveler of 1st SoCal2MuseumsMeet2010. http://www.subaru-svx.net/photos/user.php?RojoRocket Last edited by RojoRocket; 02-03-2005 at 09:57 PM. |
#11
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Hey RojoRocket,
Thanks for the tips. A little confusing, but I'll figure it out this weekend. I'd rather have more, than less information ! Quote:
Thanks again !!! Last edited by RobSVX; 02-04-2005 at 08:26 PM. |
#12
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Sorry for the delay Rob. I'm out of town. The "collector" is the large aluminium piece that attaches to the intake manifolds on either side of the motor. I would have referred to it as the intake manifold until seeing the breakdown in the manual. Best of luck with your project. Hope you get the idle back to a "purr".
Glenn
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"The only thing necessary for the triumph of evil is for good men to do nothing" Aaron Burke 1993 25th Anniversary Edition #63 of 301. R.I.P. Rojo 7/24/2008 She saved my life! 1997 Ebony Mica Pearl LSI. BLACKBERRY 1998 5-Spd Legacy GT Wagon in Glacier White: NUBURU 2005 Cadillac STS in Sandstorm Metallic: STORMY Veteran and farthest traveler of 1st SoCal2MuseumsMeet2010. http://www.subaru-svx.net/photos/user.php?RojoRocket |
#13
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Testing the auxiliary air valve.
Glenn is on the ball, this rotary valve is closed by a bi-metal spring, that can get gummed up. When it is cold the spring opens the rotary valve, to allow extra air for a faster idle speed,when the ignition is turned on, the electric heating windings heat the spring to close the valve.
An easy way to test, is to pull the AACV hose that runs from the left hand side of the black box on the throttle bodies. When the engine is cold, you should be able to blow through the valve. Then turn on the ignition, don't start the engine, after a few minuits the valve should heat up, to close the valve, and you should not be able to blow through it. Harvey. ![]()
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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. |
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