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Old 03-25-2020, 04:39 PM   #1
Stove08
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Default Engine oil coming out tailpipe

Hello everyone,
Past a vehicle on a single lane highway to notice my car was huffing blue. Pulled over and visually inspected everything as well as checked oils. All good. Continued on watching my mirrors like a hawk. Heavy blue under acceleration. Pulled over and did a another walk around the car. There was now oil up the back of the car from the tailpipes. Called the tow truck.

No feedback or fine knock warnings prior to being towed. Turbo was still spooling and sounded fine.

Possibly my oil catch can is overfull? Turbo oil return somehow pinched off?

Just trying to get an idea of what I should be doing. Fly back to the car with a spare turbo and a tool kit? Or something more serious.

Any help or suggestions would be appreciated.

I'm 1200kms away from the car now back home
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Old 03-25-2020, 07:11 PM   #2
JSR84
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Quote:
Originally Posted by Stove08 View Post
Hello everyone,
Past a vehicle on a single lane highway to notice my car was huffing blue. Pulled over and visually inspected everything as well as checked oils. All good. Continued on watching my mirrors like a hawk. Heavy blue under acceleration. Pulled over and did a another walk around the car. There was now oil up the back of the car from the tailpipes. Called the tow truck.

No feedback or fine knock warnings prior to being towed. Turbo was still spooling and sounded fine.

Possibly my oil catch can is overfull? Turbo oil return somehow pinched off?

Just trying to get an idea of what I should be doing. Fly back to the car with a spare turbo and a tool kit? Or something more serious.

Any help or suggestions would be appreciated.

I'm 1200kms away from the car now back home
I would expect that if you where getting liquid oil out of the exhaust that it would have to be something with the turbo oil / return. I find it unlikely even large amounts of blow by would cause an issue like this. If your catch can was full the oil would have to survive the combustion process and the trip through the hot exhaust and turbo.
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Old 03-25-2020, 08:50 PM   #3
Stove08
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Wishful thinking with the catch can I guess... The turbo isn't the highest of aftermarket quality so it would not surprise me. Only other thing I could think of would be a ring landing? Even if my belt skipped a few teeth and I had a valve bent like a horseshoe I couldn't get that much oil out the tailpipe from head issues?
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Old 03-25-2020, 09:20 PM   #4
Haevn
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i would pull off downpipe and check hotside of turbo
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Old 03-26-2020, 12:22 AM   #5
JSR84
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Quote:
Originally Posted by Stove08 View Post
Wishful thinking with the catch can I guess... The turbo isn't the highest of aftermarket quality so it would not surprise me. Only other thing I could think of would be a ring landing? Even if my belt skipped a few teeth and I had a valve bent like a horseshoe I couldn't get that much oil out the tailpipe from head issues?

Na, I do that believe a bent valve would cause this. And fractured ringlands cause blow-by, which I covered in my original post. I would be leaning towards that aftermarket turbo. Give the repair shop that info
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Old 03-26-2020, 08:19 AM   #6
Jay11STI
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Lets first start with what car and engine, then what mods and miles on the car. Has there been any oil consumption lately? Any oil leaks?

Have you removed the down pipe to check the hotside of the turbo for oil in it? Hows the PCV system on the car?
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Old 03-26-2020, 09:44 AM   #7
rtv900
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boy that must be a heck of a lot if it made it all way to the muffler without burning off

I can't imagine how it could get any further than the initial few feet of exhaust post turbo and remain liquid oil
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Old 03-26-2020, 10:49 AM   #8
Jedi03
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i would think turbo seals first...
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Old 03-26-2020, 12:14 PM   #9
BootsJunkie
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When I had a decent amount of oil coming out the tail pipe it was due to an exhaust valve stem seal wasn't fully seated.

Taking off the downpipe won't really narrow it down if it's coming from the engine OR turbo.
Rather, taking off the header will give you a good idea if it's coming from the turbo or engine.
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Old 03-26-2020, 01:30 PM   #10
heiche
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with dp dropped, you can also check for excessive shaft play, which means the turbo ate its bearing so lots of oil is getting by.

speaking of, did u check your oil for the glitter of doom?
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Old 03-26-2020, 04:09 PM   #11
Stove08
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Many thanks for the help so far. Definitely didn't expect I'd see oil making it to the tailpipe. Thought don't fire it back up and possibly hydraulic. I've been using the car as a long distance work commuter which wasn't what I originally purchased it for or ever wanted it to be.

09 sti with 260000ish k
Engine was rebuilt approx 45000k?
I purchased the car used with the current mods
Forged pistons and headstuds
Not sure exactly as I deleted the parts list is was given when I bought the car but...
Slightly oversized injectors and drop in fuel pump(can't verify)
Htz fp green turbo
Catless downpipe with 3" I believe to a quad tipped muffler
Cobb tuner
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Old 03-27-2020, 06:42 PM   #12
4bang4now
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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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Old 03-30-2020, 09:34 AM   #13
BlackFighter
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I remember when my turbo went to hell, oil was just pouring out of my exhaust.
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Old 03-30-2020, 06:15 PM   #14
Stove08
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Unsure on who tuned the car and size of injectors. They're small. I believe the car was making around 300 at the wheels. Tuned conservative for sure.

Never had a chance to go over the car before leaving it. Cold snap at -30ish celsius without tools at the time it broke down. Now being back on Vancouver Island with the car still up in fort st John I'm trying to make the smartest decision on what to do from here.

At this point I'm thinking toolkit, turbo and some gaskets... After doing a quick compression test and some new plugs while they're out. Empty my oil catch can, check/add engine oil and attempt to start
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Old 03-30-2020, 07:40 PM   #15
Stove08
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Quote:
Originally Posted by BlackFighter View Post
I remember when my turbo went to hell, oil was just pouring out of my exhaust.
Any issues before it happening? How did you notice? How was the engine after? Many thanks
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Old Today, 09:46 AM   #16
BlackFighter
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Eng was fine, smoke is a big give away. Hard to not notice when you have a thick white cloud of smoke behind you. If its the turbo, you might hear the turbine rattling, but might not depending at what stage of failure it is. Take the downpipe off and inspect the turbo. Not to hard if you have basic knowledge of a wrench and bolts.
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