I need a favor from you guys with working 4th gen Idle Air Control Valves. The FSM has a testing procedure that requires you to remove the IACV valve from the actual IACV housing unit (2 screws for 99's, 3 for other years) but leaving the connector plugged in.

It claims if you turn the key to IGN (not turn the car ON, but to light up all the gauge cluster lights), that the IACV should move up and down freely as you turn the key on/off.


Can you guys check to see how much the valve moves up and down when your turn the key to ON position and off? I tried it on mine and im trying to rule out if my ECU is fried from trying to use a A33 IACV on a 4th gen 00vi. Both my A32 and A33 IACV's move but it only a tiny bit. Not noticeably enough to control air flow. Like 1-2mm.



Thanks.

 

My 5th gen IACV moves maybe 3-5mm. I doesn't move much.
I have 2 of them and one moves more than the other but idle is the same with both...
Can't you check the voltage at the connector to see how much you're getting compared to what it should be getting?

 

Its the center pins right? 2 and 5?

1-2-3
4-5-6

I'm at my GF's house and dont have a FSM but i think it said to test (2) and a Ground, and 5 and a Ground.

For OHMS, it said to test 2 with 1 & 3 and 5 with 4 and 6. I did that and got a ~ohm reading, all terminals consistent. This is on the iacv itself though, not the connector.


Reason im worried my ECU is fried like the infamous 5th gen's have, is because my IACV's dont buzz... I had the TPS connected as i took apart the car today, and while testing the IACV with the Key to IGN, it moved a tiny bit, both the A33 and A32, but they didnt buzz.

 

if it moved it buzzed. The buzz itself is the motor inside pushing out the rod.