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Old 03-27-2020, 06:42 PM   #12
Scooby Newbie
Member#: 489016
Join Date: Aug 2018
2015 STI


First guess turbo seals, Second guess blowby.

Smoke coming out of oil cap? Does it pull vac with your hand over it and someone brings up the RPMs a bit? Is there any white residue here?

Pull the BPV off the ic. I know you stated you have a catch can, but I'm just ruling out easy things. Look for oil near the flower front lip. Pulling the IC you could run your finger inside the turbo outlet. Looking for traces of oil here as well.

Putting a mechanical vac gauge on car will help me here as well. Don't depend on the one in the dash its no accurate enough.

What about cylinder roughness on your AP?

Finally it gets more interesting pulling plugs, compression test/leak down, and turbo inlet or exhaust housing pull to check for shaft play.

You stated it has oversized injectors? How big if known? What tune are you using OTS or professionally done?
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