I drive 25miles to work and back every day usually stop at a gas station right before work, turn car off hop back in get on it and its cant get over 2000 rpm and sounds like a tug boat. After it sits all day then I go home is fine up until I'm almost home starts doing it again. I did a boost leak test and found the pcv valve was bad and also felt shaft play on the turbo thought it felt a little sloppy so I rebuilt the turbo. Drove good on a test drive but the first time I took it to work again it was back, I also notice when topping off the car at idle after the turbo rebuild I was getting some serious blow by out oil fill. I'm thinking bad vavle stem seals? Any help would be appreciated.

 

Got it home from work it almost didnt want to make it any sign of boost our a load and the car falls on its face.

 

All good figured it out thanks for the help, boost leaking out turbo into oil return line.

 

cool

 

think I have the same issue, I plugged the turbo hot side and pressure tested straight into the turbo inlet and air was leaking out from inside the turbo somewhere, what did you do to fix the air leaking into the oil return line?

 

I rebuilt the turbo.

 

Im still having the same issue though with no boost leaks, my car hits 5psi of boost and falls on its face and bucks and jumps, I think I have a fuel issue.

 

Interesting, don't want to go to that extreme of rebuilding the turbo as the turbo does not have any free play on the journal but I can still hear air escaping into the block some how. Is there anything else in the turbo that can cause a boost leak inside it like a seal or a gasket?

 

Why would you try to plug the hot side? Air goes into the inlet, through the compressor cover, then into the IC piping. The hot side is "connected" to the exhaust manifold.

 

when I say hot side I really meant the LICP that comes out the bottom of the turbo, I plugged that and pushed air direct into the inlet and air was escaping inside the turbo somewhere, so where would that be and why? keeping in mind there is no in out or up and down play in the journal

 

How many psi? How long did it take to bleed down?

 

I put 20 psi in and it took about 10 seconds to bleed down to 0, I also took the oil cap off and felt air come up from the filler hole with I put my hand over it, felt low pressure. Is all this normal?

 

That's not how a turbo works. And you shouldn't be doing that.

The "seals" Ima turbo are actually called pistons rings because that's what they are. They rely on pressure outside of the CHRA to be higher than inside in order to keep the oil in. So of course they don't hold any pressure .

 

I ended up getting a baffled mishimoto catch can and a GFB BOV, the metal one was 200 bucks here, so went the GFB, its all back together gain, I felt an instant change when the boost came on it felt a lot sharper, I'm thinking it was always leaking out of the old plastic BOV, so I'll take it for a run this sunday and see how it feels