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Old 03-31-2009, 10:10 AM
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DIY: Clean your IACV

IACV = Idle Air Control Valve

The function of the IACV a.k.a. Idle Air Control Valve is to adjust the idle based upon the amount of air entering the engine, then the computer reacts to this information by adjusting the cars rpm.

Why should I clean my IACV?
If you that have an erratic, fluctuating, or lumpy idle or if you have high idle after your car warms up. Or if the problem has been present for a long time, the car may stall sporadically at idle.


Tools Needed:
Small 1/4” ratchet socket wrench
10mm socket
Needle nose pliers
New IACV gasket (Honda part# 36461-PAA-A01)
Carb cleaner
Old rag to absorb over flow from removing the coolant hoses
Misc tools (to remove intake hose)

Step One: The idle air control valve (IACV) is mounted on the rear of the intake manifold (IM) near the throttle body (TB). You'll have to remove the intake hose at the throttle body to gain clearance to the rear of the IM.

Step Two: There are two 10mm screws attaching the IACV to the IM, one at the top that is partially visible and the other is lower and out of view. You'll have to feel your way back there and remove that bolt. Remove the gray plug on the right side of the IACV.

Step Three: Remove the blue plug on the TB. With the needle nose pliers,at the TB end, pull back the clamp and remove the coolant hose attaching the IACV to the TB. At this point the IACV has enough slack to pull out from behind the IM & TB. Now pull the IACV out into the void left by the intake piping. Remove the last two hoses, there is one with a clamp and one without. Viola the IACV is free.

Step Four: With the IACV in hand remove the gasket and toss it. Look at all the schmootz in the valve. Spray the IACV vigorously with the carb cleaner, cause as you can see it's very clogged and probably has tons of carbon buildup.

Step Five: Let it dry completely, then put the new gasket on and connect the two hoses, install the two bolts, connect the coolant line to the TB, reattach the blue plug at the TB, and the plug on the IACV. Re attach your intake pipe/hose and Booooyah!....you're done.

Now you can enjoy a smooth idle sputter free.

Originally Posted by 1998accordsirt View Post
You should not start the car with the IAC out. The PCM (or ECM as Honda calls it) will have no reference for idle and the engine will over rev. The IAC valve actually works a lot like the stepper motor in a printer. It even does a rail check before start up (just like a printer) to check IAC movement and so that the PCM can gain a reference point to adjust idle from.
Props to Jephu for adding pics that i procrastinated on....throw some rep his way.

Originally Posted by Jephu View Post
Cleaned my IACV today. Here are some pictures.

STEP 1:




STEP 2:







STEP 3:









STEP 4:




Put everything back in reverse order and that is it.
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Last edited by CHID0; 05-03-2009 at 01:43 PM.
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Old 03-31-2009, 10:15 AM
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Re: DIY: Clean your IACV

Repped.

Maybe I should add to this with a how-to on removing the intake manifold to clean out the throttle body, EGR ports and IACV passageways?

EDIT: Apparently I need to spread the love before I can rep you again?
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Old 03-31-2009, 10:17 AM
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Re: DIY: Clean your IACV

nice write up and good info.....one question tho...wouldnt you be able to clean this out also by seafoaming?
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Old 03-31-2009, 10:20 AM
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Re: DIY: Clean your IACV

Thanks Chido.......

jus replaced mine after i did my clutch and timing belt.....

car stalled on me while exiting the freeway....cleaned her good and got a new gasket and shes been running like a champ ever since....
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Old 03-31-2009, 10:21 AM
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Re: DIY: Clean your IACV

Originally Posted by TriNiCorD99 View Post
nice write up and good info.....one question tho...wouldnt you be able to clean this out also by seafoaming?
No, seafoam doesn't not clean out the IACV like actually removing and scrubbing it does.
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Old 03-31-2009, 10:56 AM
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Re: DIY: Clean your IACV

sweeet...im going to hit up majestic honda, hondaautomotiveparts.com, for the gasket.
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Old 03-31-2009, 10:59 AM
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Re: DIY: Clean your IACV

Originally Posted by xi0utlawstarix View Post
sweeet...im going to hit up majestic honda, hondaautomotiveparts.com, for the gasket.
They will rape your asshole on shipping... it's a rubber gasket, what's wrong with the dealer?
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Old 03-31-2009, 11:02 AM
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Re: DIY: Clean your IACV

Originally Posted by finch13 View Post
They will rape your asshole on shipping... it's a rubber gasket, what's wrong with the dealer?
shipping and
Handling Fee:
All orders will be assessed a handling fee of $4.95.

lucky me they are local, only 7% tax
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Old 03-31-2009, 11:33 AM
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Re: DIY: Clean your IACV

Can't you just pick it up there? Cause Majestic is local for you. They wanted 15 bux shipping so i just paid a slight premium and got mine from the dealer.
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Old 03-31-2009, 11:36 AM
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Re: DIY: Clean your IACV

Originally Posted by finch13 View Post
Repped.

Maybe I should add to this with a how-to on removing the intake manifold to clean out the throttle body, EGR ports and IACV passageways?

EDIT: Apparently I need to spread the love before I can rep you again?
Thanks

The more DIYs the better. My car is running like a dream now but i may still remove the IM for a more thorough cleaning
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