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Idle Air Control Valve #5169017 07/23/19 03:23 PM
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SatinSilver Offline OP
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Not sure if the car has one or not being an 05 Toyota Matrix. The mechanic took off the throttle body for cleaning and he said it didn't have one. But just one to be sure since it has a high idle on start up. Right around 1800 or so and slow to come down off of that. Car has drive-by-wire which I think they went to in 05. Need to put in new spark plugs so maybe that has something to do with it. Thank you in advance.

Rock shows the part is available but Amazon part finder doesn't. I guess I can plug the vin into Toyota's parts store and see what comes up.

Re: Idle Air Control Valve [Re: SatinSilver] #5169032 07/23/19 03:42 PM
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Dave Sherman Offline
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I think IAC valves disappeared when throttles became servo driven. No need for them when the computer controls the throttle directly. It's entirely possible there's an idle learn procedure that needs to be performed. I just had to remove the throttle body on the wife's Equinox and it reacted by idling high. The cleaning probably had something to do with that; if it builds up deposits near where the throttle rests, then cleaning them up effectively opens the throttle more. Once I did the procedure it behaved normally. The procedure on the Equinox was letting it idle for 3 minutes, turning the engine off for 60 seconds, then starting it again and letting it idle for 3 more minutes, but you may have to Google it for a Toyota.


2015 Honda Pilot EX AWD Pennzoil Platinum 0W-20 STP filter
1977 MG Midget Valvoline VR-1 20W-50 Bosch Filter
Re: Idle Air Control Valve [Re: SatinSilver] #5169102 07/23/19 05:29 PM
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incognito_2u Offline
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In 2005 there was a mid year transition with the throttle body of both the Matrix and the Corolla. Depending on when bought determined which you received.
The “ Drive by wire” design that you have means that there is no independent IAC valve. The idle is set via the ECM.
That being said, certain ECMs of that generation were recalled due to cracks in the circuit board. Reach out to Toyota Care with your VIN to be sure.
Finally, your issue with the high idle at startup most likely points to a leaky Intake Manifold Gasket. Common issue with this generation.
Ask me how I know. grin


2006 Jeep Commander 3.7 V6 -116k (M1EP5W30/XG3600)
2006 Toyota Corolla 1.8 VVTi -88k (M1EPHM5W30/XG3600)
1999 Toyota Corolla 1.8 -91k (PUP5W30/XG4386)
1998 Toyota Corolla 1.8 -68k (VME5W30/XG3600)
Re: Idle Air Control Valve [Re: SatinSilver] #5169301 07/23/19 09:36 PM
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zorobabel Offline
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I was under the impression they all idle at 1800 rpm on cold startup. I know my wife's 2004 does, very annoying.


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Re: Idle Air Control Valve [Re: incognito_2u] #5169578 07/24/19 09:44 AM
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SatinSilver Offline OP
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Originally Posted by incognito_2u
Finally, your issue with the high idle at startup most likely points to a leaky Intake Manifold Gasket. Common issue with this generation.
Ask me how I know. grin


Thanks to everyone for the posts, very helpful.

I did have the IMG replaced with the updated orange gasket last October which solved the rough running when cold. This is more of just being loud from the high rpm. I think there may be an exhaust leak on top of the muffler or something. I had the car inspected by a good mechanic last December and he said the exhaust looked good. Including a repair I had done two years ago where the donut gasket in front of the cat. converter was replaced. So I think the high idle combined with a slight exhaust leak might be the culprit. I can take it back to the muffler shop which is pretty good. They are very busy and have great reviews. Small indy shop that's been around a long time.

Re: Idle Air Control Valve [Re: SatinSilver] #5169596 07/24/19 10:02 AM
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zorobabel Offline
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I asked a friend with a 2007 Corolla, his does it too.


1997 Maxima 210k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 211k, Valvoline SynPower 5W-30, K&N HP-1003
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