I recently did a boost leak test and for the first time opened the throttle body to test the TB seals....Well no TB seal leaks, but I did find an injector that was leaking...

Afterwards I started the car and it just blew tons of smoke. My car never has smoked, so I was quite concerned. After driving for a bit the smoke stopped, so I am guessing that pressurizing the system somehow put oil into the combustion chamber or intake manifold and just needed to be burned off.

My question is how did the oil get into the combustion chamber and why would it do so from the test versus normal driving under boost (what is the difference)? (I have a DC2 catch can, so I would have thought oil would have been trapped in the can if coming from the head and into the intake or IM.)

Thanks in advance!

 

you dont need to open the tb to hear the seals leaking just fyi.... never had that happen, but i wouldnt worry about it if the smoke went away. whens the last time you did a compression test? could be blowby from the turbo seal as well, when the seals warm it will expand and seal but when cold it can give in some and maybe it did that when you were pressure testing.... which would result in oil getting in the o2 housing and smoke smoke smoke.

 

You connected the boost leak tester at the maf position and didnt unplug the valve cover breather im guessing. it wont create smoke under boost because the intake to turbo isnt pressurized.

 

if he did that then thats funny, but who knows.. that would surely pressurize the **** out of the crankcase.

 

Ughhhhh I screwed up...I actually did just take the MAF off and connected my leak tester to my Injen intake (lol)...

So I am guessing I forced oil into the combustion chambers via the valve stems... (???)

 

damn you're good man. you guessed his problem first try.

 

You win the prize Sir!

9 out of 10 times that I take a tech call on a brand new leaking turbo the customer has just performed a boost leak test that actually caused a oil leak to occur. The boost leak test should always be performed such that the crank case is not pressurized. The crank case of the engine should never had positive pressure in it during actually running of the motor. If it does, then oil will squirt out of the turbo, even if the turbo is brand new.

The best way to ensure this is to open up the valve cover vent during the boost leak test and observe the leak air escaping easily. You should also hear the oil bubbling in the pan as the leak air going thru the compressor side air seal should be venting into the pan and out the valve cover.

This must be very easy to get wrong on the EVOX, it happens very often with the EVOX application.

BOOSTON!

Robert Young

 

*crosses fingers* (new turbo, new turbo!!) Haha thanks Robert! I actually had this problem in march and ended up talking to you on the phone. Its great info to know since it is easy to do.

 

valve cover? are you talking about the oil cap?

 

nope. the breather on the right side of the valve cover. the line routing back into your intake.

 

so you saying i have to unplug it from the valve cover? do i remove the oil cap when doing the boost leak?

i did a boost leak test last week, just took the intake off plugged the mbc and pressurized. i hope i didnt damage anything cause my exhaust has a weird smell to it after the test almost smells like oil or a really rich smell?

 

on your intake, disconnect the line that routes to your valve cover. or you can skip all of this and just connect your tester directly onto your turbo and you wont have to disconnect any lines.

 

oh i connected it straight to the turbo so im good then?

 

^ yes...

 

Hey!
In this case, is it necessary to change something on the turbo or is it just question of time before the car stop smoking???