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Old 04-10-2019, 06:11 PM   #1
JLSTi
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Member#: 488750
Join Date: Jul 2018
Default 2011 STi(EJ257) Oil smoke after long idle?

Greetings NASIOC!

I own a 2011 STi with 14 000KM on the engine and I get a pretty big smoke cloud(oil smoke) when pulling away after letting the car idle for over 5 minutes.
It doesn't happen all the time but happens enough to have me slightly worried.

Mods on car :
- Invidia Q300 catback
- Cobb SF intake
- V3 AP
Stage 1 91 map

Things I have checked so far
- No noticeable blow-by, no smoke at all when leaving the oil filler cap open at idle.
- No oil in intake, intercooler is also perfectly dry, not a single hint of oil in there.
- I don't need to add any oil inbetween oil changes, currently at 5 500km on this oil(needs to be changed i know) and it still shows full.
I run Shell Rotella T6 5W40 full synthethic with the original filter.
- Turbo boosts just fine, peaks at 17-18psi and settles at 15psi, no visible smoke under full acceleration.

Is it a common thing for the EJ25 to throw a smoke cloud when accelerating after idling for a moment?

I also noticed, it doesn't happen when I start the car cold in the morning, i'll pull away without a single hint of smoke.
It seems to happen more if the car is already warm from driving, and you let it sit at idle for 5-10 minutes then leave, that's when the smoke will show.

Is there someone out here who had similar experiences or had any idea of what could be causing this?

Thanks!
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Old 04-11-2019, 07:30 AM   #2
Jay11STI
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Member#: 492422
Join Date: Oct 2018
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If you take a video and post it, it will really help determine if there is actually something going on here or not. This kind of sounds like a valve seal issue but this is all just speculation. Weather you have oil in the intake trac or not i would start with replacing the PCV valve first and report back after.
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Old 04-11-2019, 08:15 AM   #3
JLSTi
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Thanks for the reply,

I'll throw a new pcv valve in and see if that fixes the issue.
Valve seals could be the problem but since the engine is a complete shortblock from Subaru and has 14 000km, I wouldn't quite point at the valve seals just yet.
It also was smoking before, it just seemed to have stopped for a while, it did it last oil change also, at around 9 000km, I would get huge smoke clouds after letting it idle for a while, and now the "problem" is back.
The car is not over-filled, I can confirm that 100%

So next step, PCV valve, report back, thanks!
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Old 04-11-2019, 08:39 AM   #4
Turpid Porpoise
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Chapter/Region: MAIC
Location: Virginia
Vehicle:
2008 Impreza WRX STi
Silver

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Quote:
Originally Posted by JLSTi View Post
Thanks for the reply,

I'll throw a new pcv valve in and see if that fixes the issue.
Valve seals could be the problem but since the engine is a complete shortblock from Subaru and has 14 000km, I wouldn't quite point at the valve seals just yet.
It also was smoking before, it just seemed to have stopped for a while, it did it last oil change also, at around 9 000km, I would get huge smoke clouds after letting it idle for a while, and now the "problem" is back.
The car is not over-filled, I can confirm that 100%

So next step, PCV valve, report back, thanks!
The valves are in the heads, not the shortblock so a new OEM shortblock wouldn't have anything to do with valve seals leaking.

It could also be your turbo. Pull the downpipe off and check the inside of the turbine housing for oil.
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Old 04-11-2019, 04:43 PM   #5
Jay11STI
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Quote:
Originally Posted by JLSTi View Post
Thanks for the reply,

I'll throw a new pcv valve in and see if that fixes the issue.
Valve seals could be the problem but since the engine is a complete shortblock from Subaru and has 14 000km, I wouldn't quite point at the valve seals just yet.
It also was smoking before, it just seemed to have stopped for a while, it did it last oil change also, at around 9 000km, I would get huge smoke clouds after letting it idle for a while, and now the "problem" is back.
The car is not over-filled, I can confirm that 100%

So next step, PCV valve, report back, thanks!
A subaru OEM short block comes as just the bare bottom end of the engine. Literally block and pistons assembled. The cylinder heads, manifolds, turbo, cam gears, accessories, wiring harness, and other things are all swapped over.

Its possible you were having a valve seal problem before and has now carried over. There is also a possibility there could be oil in your down pipe coming from the turbo. If you would like, you could also pop off the down pipe and check the hot side of the turbo for any oil there and in the down pipe like previously mentioned above. BUT i would imagine if this were the case, you would have heavy smoking on cold starts. I still think you should go with replacing the pcv valve first and seeing if this helps.
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Old 04-14-2019, 08:25 PM   #6
Jaya1c
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Same I found out it was just my
Power steering pump leaking
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Old 04-16-2019, 10:55 AM   #7
ceniack
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I had a similar issue in my 240sx back in the day and it was the valve seals, it could be completely unrelated to getting your block done.
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