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02-20-2019, 02:12 PM | #1 |
Scooby Newbie
Member#: 420235
Join Date: May 2015
Location: Albany, NY
Vehicle:2015 WRX WR Blue |
FA20 Bad Valve Stem Seals
I own a 2015 WRX with a turbo back exhaust, cobb intake, killer b after cooler, killer b charge pipe, TGV deletes, EGR deletes, Grimmspeed EBC and Manley connecting rods. Started to notice some smoke while idling back in September after moving back to NY. Brought it to the local tuner and they installed a Perrin oil restrictor. I never had any issues with smoke since the day a bought the car. I've been running Mobil 1 full synthetic for every oil change. I would shoot for every 3-5k on miles depending on the driving/temperature. Changed the oil and started keeping track of oil consumption since the Perrin oil restrictor didn't do a thing. I went from full to 1/4 on the dipstick over 800 miles. I added about a half of quart of oil and noticed it would smoke at idle and take off. I just brought it back to the shop and they removed the turbo and exhaust manifold. The valve stem seals are leaking and they now need to be replaced.
What would cause this issue with only 50k on the car? Is there anything else besides replacing the valve stem seals that should be looked at?
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02-20-2019, 02:32 PM | #2 |
Scooby Newbie
Member#: 452248
Join Date: Aug 2016
Chapter/Region:
MWSOC
Location: Cleveland Ohio
Vehicle:2017 Base WRX WRB |
This is the first I have heard of bad valve stem seals on an FA20.
Valve stems seals usually fail due to excessive heat. Did you have any issues with EGT's? |
02-20-2019, 03:51 PM | #3 |
Former Vendor
Member#: 93646
Join Date: Aug 2005
Chapter/Region:
MWSOC
Vehicle:Many Track Records Let us help you go fast! |
that much oil missing in 800 miles would mean your valve stem seals are missing, not leaking. As in ALL of them missing.
You have something else going on. Now you COULD have some leaking valve seals, BUT I would strongly recommend 1) a compression test and 2) inspection of the turbo. |
02-20-2019, 04:43 PM | #4 |
Scooby Specialist
Member#: 421271
Join Date: May 2015
Chapter/Region:
MWSOC
Location: Chicago
Vehicle:2015 WRX Galaxy Blue Pearl |
I’ve heard of leaking seals before, like TiC said though that seems like a lot of oil loss from those alone.
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02-21-2019, 08:12 AM | #5 |
Scooby Specialist
Member#: 207263
Join Date: Mar 2009
Chapter/Region:
MWSOC
Location: Indianapolis area
Vehicle:2019 WRX Limited World Rally Blue |
I wonder if turbo is burning oil. That is, oil leak into the turbine section?
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02-21-2019, 09:15 AM | #6 |
Scooby Newbie
Member#: 420235
Join Date: May 2015
Location: Albany, NY
Vehicle:2015 WRX WR Blue |
They are going to pull the motor. I will also have them take a look at the turbo. This is the second time this shop has seen valve stem seals go on a FA20.
I only have ~14,000 miles on the rings. The motor work was actually done at TIC. |
02-21-2019, 11:53 AM | #7 | |
Former Vendor
Member#: 93646
Join Date: Aug 2005
Chapter/Region:
MWSOC
Vehicle:Many Track Records Let us help you go fast! |
Quote:
-Clint |
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03-21-2019, 12:51 PM | #8 |
Scooby Newbie
Member#: 430590
Join Date: Sep 2015
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Any status updates?
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05-19-2019, 06:55 PM | #9 |
Scooby Newbie
Member#: 393545
Join Date: Jun 2014
Location: CT
Vehicle:2015 WRX (6MT) DGM |
Updates?
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05-22-2019, 12:36 PM | #10 |
Scooby Newbie
Member#: 501872
Join Date: May 2019
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same thing happens with my car and im not sure what to do to be completely honest with you
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05-22-2019, 11:19 PM | #11 |
Scooby Newbie
Member#: 497351
Join Date: Feb 2019
Location: Down Under
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also interested on an update to this thread.
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09-15-2019, 02:16 AM | #12 |
Scooby Newbie
Member#: 453501
Join Date: Aug 2016
Location: Colorado
Vehicle:2015 WRX |
Any updates on this? I have a 2015 WRX that is showing similar issues.
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11-14-2019, 04:40 PM | #13 |
Scooby Newbie
Member#: 508132
Join Date: Nov 2019
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Any update on this? I think I'm have the same issue.
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11-14-2019, 05:25 PM | #14 |
Scooby Newbie
Member#: 439586
Join Date: Feb 2016
Chapter/Region:
MWSOC
Location: Omaha, NE
Vehicle:2015 WRX ISM |
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12-03-2019, 09:10 PM | #15 |
Scooby Newbie
Member#: 393856
Join Date: Jun 2014
Chapter/Region:
NWIC
Location: Wetside of Oregon
Vehicle:2004 WRX WRB |
Similar symptoms on my 2015 with 35k and stage 2+. Perrin restrictor did not fix smoke during idle, throttle blips, and takeoffs. Mine doesn't burn as much oil, but enough that I have to add a quart per oil change.
Always has a minor amount of oil in the top of the charge pipe when I take the intercooler off, which everyone says is normal. The MAP sensor in the top center of the intake manifold had significant oil residue, which is more concerning to me. I will be doing a compression check and if that doesn't highlight the issue, I'll probably have to remove the turbo and rebuild it unless someone has other items to check first. |
12-03-2019, 10:00 PM | #16 |
Scooby Guru
Member#: 90539
Join Date: Jul 2005
Chapter/Region:
South East
Location: SWLA
Vehicle:My BOV goes COVFEFE! |
Like mentioned previously, if you're getting that much smoke, the stem seals would either have to be missing or even popped off. They could also be damaged from excessive extreme temperatures, but before they went you'd think the valve faces or seats would be damaged. I'm also curious if there's some kind of factory defect/quality issue with the seal material or fitment. I've seen stem seals come off on some older vehicles when crappy seals were used and they wouldn't lock properly on the stems, but you wouldn't think that could happen with oem. That's a LOT of oil to lose in 800 miles, even if turns out to be something else. If seals are starting to leak, at idle you wouldn't even notice smoke. Once they are really worn, they still usually only make visual smoke at first start, and the smoke burns off. If the seals are actually the culprit, they have major damage or came off the stem.
Looking forward to what they come up with. Good luck, hopefully it's actually a seal problem. Way less invasive than block work, at least while the heads are off the block. |
12-04-2019, 02:22 PM | #17 | |
Scooby Newbie
Member#: 480524
Join Date: Jan 2018
Location: Pa
Vehicle:2015 WRX Black |
Quote:
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12-04-2019, 02:25 PM | #18 | |
Scooby Newbie
Member#: 480524
Join Date: Jan 2018
Location: Pa
Vehicle:2015 WRX Black |
Quote:
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12-04-2019, 02:47 PM | #19 | |
Scooby Specialist
Member#: 450713
Join Date: Jul 2016
Chapter/Region:
Tri-State
Location: Super bowl LII champs
Vehicle:2017 WRX Stage 3ish world rally blue |
Quote:
My car burned more oil and smoked more when it was really hot out. Now that its cold I'm hardly having either of these problems. That's why I'm thinking its related to oil viscosity. Currently running motul xclean 5w30 efe |
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03-04-2020, 07:08 PM | #20 |
Scooby Newbie
Member#: 393856
Join Date: Jun 2014
Chapter/Region:
NWIC
Location: Wetside of Oregon
Vehicle:2004 WRX WRB |
Still haven't found anything conclusive, but I did do a compression check and all cylinders were within a pound or two of each other. I tested with the engine warm and cold, but both results had the same PSI, which was 155. I spoke to one tuner who said those numbers are fine, but I thought I read somewhere that 190 was spec. Does anybody know what PSI they should be at?
With the sensor on top of the intake manifold collecting oil residue, I've been leaning more towards the turbo seals, but there is zero residue inside the intercooler and I would expect there to be. Has anybody used the tomei turbo rebuild kit from Subispeed yet? |
03-04-2020, 07:26 PM | #21 |
Scooby Newbie
Member#: 505996
Join Date: Sep 2019
Location: Asheville, NC
Vehicle:2018 WRX Silver |
An update from the OP seems in order.
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03-06-2020, 09:32 AM | #22 |
Scooby Newbie
Member#: 508132
Join Date: Nov 2019
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I had a similar issue. The car will smoke on start up. Did a engine rebuild and found that the exhaust valve seals were not on properly. No smoke for 3 days now, I'm still breaking in the engine.
I also what to rebuild the stock turbo. Is there an rebuild kit for it? |
07-20-2020, 09:00 AM | #23 |
Scooby Newbie
Member#: 464491
Join Date: Mar 2017
Location: Kazakhstan
Vehicle:2015 Forester XT White |
I had a similar issue. The car was smoke on start up and on idle. Oil consumption was 1 quart per 2000 miles.
After disassembling the engine, it turned out that the valve stem seals on the exhaust valves fell off the guides (6 of 8 valve stem seals). The valve stem seals are not worn out (they are completely intact). It looks like it were not fully dressed at the factory during assembly. Subaru Forester 2015 XT (FA20DIT), mileage 40k miles (65000km) My config: INVIDIA Catback exhaust, Killer-B Jpipe, Nameless Bypass, 3-port turbo solenoid, Perrin turbo restrictor, CNT Intercooler, Mishimoto ChargePipe, AccessPort tuned by professional tuner. Peak boost 1.2 bar. Last edited by Omega_793; 07-20-2020 at 09:08 AM. |
07-20-2020, 09:49 AM | #24 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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I had one lonely intake valve seal fall off or not get installed correctly on the ej I rebuilt not too long ago. Smoked so much, been putting off pulling it back out
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09-24-2020, 01:17 AM | #25 |
Scooby Specialist
Member#: 115756
Join Date: May 2006
Chapter/Region:
MWSOC
Location: illinois
Vehicle:2002 wrx impreza ASPEN WHITE |
Got a oil leak on my header gasket on the passenger side, do you guys think it's a valve seal issues? guys know how much is it to fox it? just got the car like a month ago 2015 w/ 54k miles
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