SR20DET - HIGH IDLE - Idle Air Control Valve Diagnosis and Replacement

Hello and welcome back!
The freshly built SR is running great and some break-in miles have been put on the engine. Even after getting a solid base tune the idle has been around 1200 rpm. I finally decided to order an idle air control valve to fix the high idle issue. After setting the timing, getting a base tune, and trying a couple other things showed in the video, I wanted to stop wondering if replacing the valve would fix it.
This video is a little longer than I normally post, but I wanted to show the installation of the idle air control valve also.
Thank you for the support and I hope everyone has a great day!
Leave a comment if you're stuck on your project and I'll see if I can offer some assistance!

[@hersonsegovia2373]

It's your coolant lines bro. I did this on my S13 I brought over. The circuit you tested is the high idle or bump idle for AC/power steering. The coolant lines you didn't hook up makes the IACV think the car isn't warm so it stays open thus the high idle. Your ecu mainly controls fuel but there is idle settings you can mess with. Good luck homie! 🙌

[@garagehotcar]

Thanks for your input! I’ll definitely check into that again 👍🏻

[@DJizz82]

You mentioned deleting a few thing on the intake manifold side. Usually when this happens idle is really off. I suggest keeping the OEM plumbing in tact. Also, try going through the FSM process for setting up your idle. I’ve had similar experiences with idle and timing. I followed the FSM and NOT Zilvia. Everything worked out perfectly.

[@lexustech]

Dude, great job on the videos you’re killing it

[@garagehotcar]

Thank you! Still have a ton to learn. I hope all is well!

[@SoThick]

Thank you for documenting the process. My IACV just went out last night and I was wondering how to get to it and find it. Sadly my SR20DET is in a sentra so the intake man is pointing to the firewall. SAD times. My symptom is 2-3k rpm idle and the car "acting like the gas pedal is being held" for lack of better words. Free rev matching and cruise control.

[@garagehotcar]

Glad to help! Let me know what fixes it! haha