IACV question
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Driver School Candidate
Joined: Aug 2013
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From: wa
IACV question
I have cleaned my IACV as recommended in the Forum. The magnetic "slug" rotates freely about 75 degrees. My question is, is the shaft supposed to spring return at the end of rotation, or does it remain in the position you leave it until magnetically activated? Mine stays in the position I let go of it. Thanks for the help. Drrako 1999 RX300
Last edited by drrako; Mar 24, 2018 at 03:02 PM. Reason: info
CL Community Team
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From: Austin, TX
Salim
Thread Starter
Driver School Candidate
Joined: Aug 2013
Posts: 3
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From: wa
Iacv
Hmmm. Seems we have 2 different opinions. Yes, it's quite clean, and rotates freely through the 75 degrees. However, I put everything back together and it still nearly stalls out on a cold startup, then runs and starts fine. My suspicion is, that if the rotating valve is supposed to spring back to a "cold" position for cold startup and isn't doing so, this might explain what's going on - and I would need to replace the IACV. So - springs back, or not?
Instructor
Joined: Oct 2005
Posts: 1,091
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From: pa
It springs back, believe it or not. Pretty sure it is spring action but it has been many years since I had one part. Also, there are a couple different designs and maybe one return is magnetic force. If you are interested in looking, there is one very detailed thread on this item over in ToyotaNation. The fast idle opening is controlled by the ECU, not the spring. The spring is only there for fail safe. You can test yours by applying voltage. It should snap open and snap shut. When shut, you will still see a small opening.
Last edited by artbuc; Mar 25, 2018 at 11:59 AM.
CL Community Team
Joined: Apr 2001
Posts: 16,573
Likes: 1,393
From: Austin, TX
Hmmm. Seems we have 2 different opinions. Yes, it's quite clean, and rotates freely through the 75 degrees. However, I put everything back together and it still nearly stalls out on a cold startup, then runs and starts fine. My suspicion is, that if the rotating valve is supposed to spring back to a "cold" position for cold startup and isn't doing so, this might explain what's going on - and I would need to replace the IACV. So - springs back, or not?
Keep in mind that after you clean the IACV, you should disconnect the battery 20 mins or so and then start the vehicle and let it idle for about 15 minutes to re learn.
Salim
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