How to Test an Idle Air Control Valve

[GripFreak]

The mistake most techs make is unplugging the IAC with the engine still running. DO NOT do that! You can pop the IAC driver in the ecm. I know of hundreds of ecm's from GM that came in for repair and the driver for the IAC was blown due to this mistake. It may or may not pop the ecm the first time but it happens more often than not. This guy showed and explained the correct way (one of several) to test the IAC motor.

[panasonicchrome]

Best video to test Iac sensor i seen 👍 Thanks 👍

[goldenthrone]

simple, i like it. that throttle body valve is super dirty lol

[michaelvazquez]

It idles the same plugged as it is unplugged. Is it my wire connector or the actual iac valve? The iac valve i just bought from auto zone and thats when my problem started

[JW_______]

What if the IAC is stuck closed? Then the test wouldn't work presumably.

[tuannguyen-ytty]

This is a great test, thank for sharing

[bobtailsthecat]

i’m chasing a high idle at 1k in my 95 f150 5.0. Unplugging the iacv drops the idle to normal 650-800

[WCGwkf]

Lol that's great it bounces on 1500, like my problem plugged or unplugged. But it was replaced, maybe its the harness or the ecm still.

[dannymartinez]

Mine stalls after starting up, and when i unplug the connector, and then start it, it will stay running but at low idle and rough, I've cleaned the TB and IAC, is that telling me i need a new IAC?

[pro-duct]

What if the IAC is already bad when doing this test. Will the idle still change? As it already bad.

[wallysjimenez]

I just installed a new IAC and its rev 1300.. why?

[UltimatumDemon]

When i rev up to 3k, SOMETIMES it drops a bit too far and you can feel the engine almost stalling

[gail]

HELLO on my 98 KIA SPORTAGE when I first start I GET 4, 000 RPMS..way too high..then when I DISCONNECT THE IAC VALVE AND RESTART CAR THE RPMS DROP TO A REGUALR 850 RPMS~~IS THIS IAC VALVE BAD?? THE CHECK ENGINE LITE CAME I WEHN I DISCONNECTED THE HARNESS.

[nadeem]

just want to know that when the car is NOT idling and it is running over 4 rpm around 120 kilometers per hour speed so what would be the reading of IAC valve on OBD2? plz note that car is having Cable less electronic throttle body.
my car shows IAC readings fluctuating during drive too, is it normal ? thanks. in advance.

[PhilipMaguire-iyth]

If unplugged mean idel is faulty please momes states same ? Unplugged. Nissan micra 2002 petrol

[ricoflex]

This video was helpful but not that much because running your engine with something unplugged can cause it to go into limp mode ... And most of all electrical devices unplugged is different compared to a electrical device that is worn down or maybe blocked off by dirt or debris...👍🏼

[rowanrichard]

I did this test and my car won’t start now, what did I do wrong? I unplugged it and it didn’t start, then plugged it back in and it cranked but wouldn’t start.

[johnnydiaz]

After starting the car the rpms take 2 minute's to go down to normal rpms while there is a weird noise In the engine

[angelamichelle]

Can u tell me what part of my meter I put it on to check my IAC I don't even know how to read it

[ssd]

What do you unplug???
What do you use to clean the ICA?