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Old 11-30-2012, 07:49 AM   #15
Scooby Specialist
Member#: 236927
Join Date: Jan 2010
Chapter/Region: NESIC
Location: Oakville CT
2015 BRZ 93 LEGacy33
1984 BRAT


Originally Posted by Kijho View Post
Does anybody have any information in regards to adjusting the IACV?
I see there are 2 screws, one on each side of the actual top of the control valve as pictured above. Would adjusting this valve has any effect?

I'll be taking it all off tomorrow to give it a good cleaning inside.
I've messed around with the valve, setting it at different positions, and I found it doesn't really matter the degree in which you turn it too.

I've set it at the highest point, and it idled very high at first, then once the ECU learned it's position, it set itself back to a 500 rpms warm idle.

I've set it incrementally to the lowest point (setting it from highest to lowest instantly caused it to stall) and the warm idle would make it's way back to 500 rpms.

After that I just set it to what was marked by the white markings. It doesn't really matter where you set it too, but there is really no need to adjust because the ECU learns the position of the valve and adjusts accordingly.

If you are having trouble with the IACV, here is a video I made:

As Scotty and I have previously stated, the coolant temp sensor could be at fault as well. I have early coolant temp sensor resistance measurements you can go by if you want to test. (Haynes book is ridiculously incorrect with their resistance table)
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Jessekrs123 is offline   Reply With Quote