How to boost leak test a Subaru STI

[@MrVoodoo5050]

lol… I feel your pain with the top mount install. Good video on boost leak troubleshooting!

[@E85_STI]

Awesome that you drive an STI and understand how to work on these. Not a lot of people know how to boost leak test and I e made one in the past with the coupler and a tire shredder valve.

[@GarageQueens]

It’s my goal to understand how to work on every vehicle I own, runs in my blood. Every turbo Subaru owner should have some knowledge on how to boost leak test their Subarus to prevent any expensive EJ fatalities!

[@miriamvivo4279]

Have a po302 on my 2006 sti. This is next

[@E85_STI]

@@miriamvivo4279 so mine is fully built and on 40 lbs of boost but I don’t drive on that map I stay on the 35 psi map and mine had a cylinder 2 roughness but no cel so I did all the test and compression test but even though I had my injectors cleaned last year they go dirty again so I sent them out to get flow matched and balanced and sure enough my number 2 was the dirtiest so now the car is running great again.

[@raymanguino7696]

Lol at the tmic install. The struggles are so true

[@GarageQueens]

Never once have I had a top mount slide on both couplers first try haha

[@guardrailbiter]

@@GarageQueens The top-mount air-to-air intercooler on the 3S-GTE (USDM Toyota Celica All-trac) is actually pretty trouble-free to remove & install. Can't blame you if you've never poked under the hood of one of those given they're old & rare. *** I specified USDM because JDM and others received a water-to-air top-mount which would surely have been labor intensive.

[@alexandruionita3508]

Thanks for showing us that putting the intercooler back is not easy, I found it a pain too ;)

[@711liljay]

I love the conversation between parts 😂

[@lorenlizotte]

Thanks for the video. I was hoping for a simpler video on how to check for leaks without the gear. 😂a girl can dream

[@GarageQueens]

Haha unfortunately there isn’t a simple way to check for boost leaks properly. To know exactly what is leaking and how bad, an air compressor and an inlet adapter is the best way

[@evanrosario]

There is. Grab a bong and smoke out your subie

[@brettmills2470]

Best video I have seen on this for Subarus so far, good information and thanks! 😎🤙🏻

[@GarageQueens]

I did my best to include all of the important stuff! Thanks for the input and thanks for watching!

[@quilarvitar]

omg car women 😭😭😭 I’m so happy thanks for the video babes!!!

[@BraveheartSTIS209]

9:13 I understand, I’ve been there many times. And I know I have many more to come. LOL Great job.

[@GarageQueens]

Appreciate the shared pain of the glorious top mounts haha

[@theloniousmonk2169]

Installing that top mount is a huge pain in the ass!

[@GarageQueens]

Anyone who tells you otherwise is lying

[@miriamvivo4279]

Es la verdad

[@jamesdalton09]

There’s only a couple things on a car that make me use the words cock sucker and a tmic is one of them lol

[@GarageQueens]

I 100% agree! Haha

[@miriamvivo4279]

And carajo punyeta

[@pigeonsil240sx]

i used to just blow into my tester for a quick way to find leaks but yesterday changed everything,i found a leak at injector o ring ONLY after a few psi was introduced,without pressure there was no leak so now i add the same psi as my wastegate boost is so i dont miss anything

[@miriamvivo4279]

Top mount intercooler is a big PITA to put back on . No doubt

[@kelseyn9749]

The soapy water to find the leak was a really smart trick!

[@GarageQueens]

With everything under pressure, it doesn’t take much to start blowing bubbles

[@merser36]

So what do you do if you have an AOS?

[@trevorroszell1304]

Awesome

[@j20sti]

So is that the cause of my bypass valve not triggering yet still being able to hit boost???

[@GarageQueens]

It’s always good to check for boost leaks every year on a turbo Subaru. If your bypass valve isn’t opening, it could be sticking and might be a good time to replace it.

[@j20sti]

@@GarageQueens I’ve replaced it with a brand new 100% recirc bypass valve by turbo smart and same thing I can’t hear it… my homie that owns the same car I do said get an intake but idk if that’s the issue at hand

[@SubiCarLous]

9:40 😂My first time was exactly like this. The right technique is too push the intercooler against the firewall and to the right and then lift first the the front part (where the hose to the throttle body is) and it will come off easy. Now my question: Why did you cap off the PCV valve at 3:04? I though it should not be capped off because of the pressure?

[@GarageQueens]

It’s always putting the top mount back on that’s the stubborn part 😅 Usually you should cap off the pcv valve because as you apply pressure into the turbo inlet, you don’t want to pressurize the pcv valve as that could pressurize the crank case. Looking for boost leaks, not creating oil leaks 😅

[@SubiCarLous]

@@GarageQueens Maybe I misunderstood something but then you have to cap off only the pcv opening at the turbo inlet and not also at the engine so then when you pressurize the inlet and basically the whole engine the air will bypass the piston rings to the crankcase and can escape over the open PCV openings. Is this correct?

[@trojangpete8]

Wolf you still recommend the boost leak testing kit?

[@GarageQueens]

Some people make their own as it’s more cost effective for how little it gets used. But having a garage that frequently has 3 turbo Subarus in it, along with working on them Monday-Friday, having the legitimate kit certainly makes it easier and worth the investment!

[@miriamvivo4279]

Autool sdt 304

[@miriamvivo4279]

Just found this.

[@thenicaraguan]

TMIC is the biggest PITA. I want to go FMIC just because i hate it so much.

[@GarageQueens]

The only way it would go back on was when I threatened to throw it out in exchange for a front mount haha

[@trojangpete8]

Would

[@MiguelLopez-ni4ur]

🤣🫶🏽

[@trojangpete8]

Lol 😂