Subaru Conversion Won't Idle Options

[turnaround89]

Hi everyone, so December 2018 was the first time I got to hear the WRX STi motor I purchased run. It ran rough because the intake wasn't connected, hardly any sensors hooked up, etc. However, it ran and that made me happy knowing my investment wasn't useless.

The engine that was purchased is supposed to be a subaru wrx gc8 sti v4 turbo ej20

Cut to a few months later, now I have all the required sensors (MAF, purge solenoid, ignitor, etc) that I was missing purchased and hooked up. Vacuum hoses hooked up and I thought now the engine should run and idle beautifully. Nope, it will fire and run for maybe 3 seconds then shut off. Check out the video in the link.

Subaru Engine Video

The only thing I dont have hooked up are to the non-pressure side of the intake. I tried plugging these holes today and the car did t idle any better. Now, I need to find a permanent solution to these holes, but I swear the engine is running worse now with everything hooked up then in December with nothing hooked up.

Any ideas where I could start?

I was thinking fuel pressure and timing would be my next step. In the video you can hear the fuel pump prime the system before the engine kicks over.

The wiring harness was sent out to iwire services to be redone and that appears to be functioning properly.

Thank you everyone for your help.

[lierofox]

I ended up getting an aftermarket silicone intake for my Subaru (that I still have yet to install...d'oh) that has all the proper ports on it, though it's designed for use with the stock, non-flipped intake manifold position.

https://www.ebay.com/itm/Silicone-Turbo-Int...;frcectupt=true

That one's basically the same as the one I got, the long thin snorkel looking tube would just need a nipple fitting to allow you to plug the IAC inlet hose into it.

As for stock vs aftermarket recirculation/BOVs... there's a lot of discussion about that regarding why it vents back to the intake in stock configuration. A lot of people cite that the AFRs will be messed up if it vents to atmosphere because the MAF already measured for that air. I don't know if I buy that as being THAT important since snapping the throttle closed would change the AFR regardless (plus the massive volume of compressed air would just blow back up the turbo inlet, past the MAF, and towards the airbox. Does the MAF have a way of telling what direction the air is flowing past it?)

Personally, I think the MAIN reason it vents back to the intake is just because the stock Subaru airbox and intake resonators will help muffle the sound of it.

[pploco]

I ended up getting an aftermarket silicone intake for my Subaru (that I still have yet to install...d'oh) that has all the proper ports on it, though it's designed for use with the stock, non-flipped intake manifold position.

https://www.ebay.com/itm/Silicone-Turbo-Int...;frcectupt=true

That one's basically the same as the one I got, the long thin snorkel looking tube would just need a nipple fitting to allow you to plug the IAC inlet hose into it.

As for stock vs aftermarket recirculation/BOVs... there's a lot of discussion about that regarding why it vents back to the intake in stock configuration. A lot of people cite that the AFRs will be messed up if it vents to atmosphere because the MAF already measured for that air. I don't know if I buy that as being THAT important since snapping the throttle closed would change the AFR regardless (plus the massive volume of compressed air would just blow back up the turbo inlet, past the MAF, and towards the airbox. Does the MAF have a way of telling what direction the air is flowing past it?)

Personally, I think the MAIN reason it vents back to the intake is just because the stock Subaru airbox and intake resonators will help muffle the sound of it.

Yep