Do FA20s normally get this dirty after ~80k miles? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

vfrqqq · 12-26-2023, 03:33 PM

I removed the manifold on my engine and found quite a bit of gunk in the intake manifold and ports. Is this normal for an FA20 with about 80,000 miles on it? It’s all oily, gunk that wipes off relatively easily, but I don't have experience with how dirty these motors can get and this seems excessive. Also, this is a replacement motor and I know nothing of its history beyond that it was compression and run tested by the seller, so I'm wondering if this maybe indicates how this FA20 was run before me.

Sorry if there are already plenty of posts about this, but I always get an error now when I try to use the forum search function.

whataboutbob · 12-26-2023, 04:15 PM

I think a catch can would help with this. Even NA I got a decent amount of blow-by and I suspect what you are seeing is a result of blow-by.

NoHaveMSG · 12-28-2023, 09:46 PM

That’s a bit heavier than I expect to see at that millage. A leak down is a better test than just compression. You could also try a WRX pvc. Bit stouter for the boost.

vfrqqq · 12-30-2023, 09:16 AM

I should add that, from the salvage pictures of the donor vehicle, the previous user at least wasn't running any FI and everything appeared to be stock from what I saw in the engine bay. Of course, that says nothing about how it was driven or was running an other-than-factory tune on the ECU.

Opie · 01-02-2024, 11:42 AM

Looks normal to me. Many intakes on modern engines get soot like this due to the EGR systems. I'd recommend replacing the PCV when installing it and using some intake and carb cleaner to clean it up.

FR-S2GT86 · 01-05-2024, 09:32 AM

@vfrqqq Are you running or planning to run forced induction?

vfrqqq · 01-14-2024, 07:50 AM

Quote:

Originally Posted by FR-S2GT86

@vfrqqq Are you running or planning to run forced induction?

I'm not running or planning to run forced induction. All the same, I installed a PCV/CCV dual catch can system to help mitigate the problem. I'm also planning to run a flexfuel tune on this NA setup and am curious if using flexfuel every now and then will sort of "clean" this up over time.

Muffled · 03-28-2024, 02:22 AM

I thought port injection was supposed to help with exactly this issue?

dragoontwo · 03-28-2024, 06:28 AM

It did help with the issue. The port injectors won't keep it spotless.

alphasaur · 03-28-2024, 05:49 PM

Recently removed my manifold for injector replacement and my valve were pretty spotless at approx ~70k miles. I have often run ethanol though.

I will likely be pulling manifold again soon and will check how they look post boost.

12-26-2023, 03:33 PM	#1
vfrqqq Ultra Senior Member Join Date: Feb 2014 Drives: 2014 BRZ Premium, WRB Location: East Coast, US Posts: 209 Thanks: 43 Thanked 60 Times in 37 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Do FA20s normally get this dirty after ~80k miles? I removed the manifold on my engine and found quite a bit of gunk in the intake manifold and ports. Is this normal for an FA20 with about 80,000 miles on it? It’s all oily, gunk that wipes off relatively easily, but I don't have experience with how dirty these motors can get and this seems excessive. Also, this is a replacement motor and I know nothing of its history beyond that it was compression and run tested by the seller, so I'm wondering if this maybe indicates how this FA20 was run before me. Sorry if there are already plenty of posts about this, but I always get an error now when I try to use the forum search function. Attached Images

03-28-2024, 06:28 AM	#9
dragoontwo Senior Member Join Date: May 2020 Drives: 22 BRZ limited Location: Clarksville TN Posts: 1,183 Thanks: 217 Thanked 990 Times in 521 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	It did help with the issue. The port injectors won't keep it spotless. __________________ 22 Service manuals 22 New car information

03-28-2024, 05:49 PM	#10
alphasaur friendly Join Date: Oct 2018 Drives: 17' 86 Location: Dutchess County, NY Posts: 719 Thanks: 1,442 Thanked 466 Times in 284 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Recently removed my manifold for injector replacement and my valve were pretty spotless at approx ~70k miles. I have often run ethanol though. I will likely be pulling manifold again soon and will check how they look post boost. __________________ Seek comfort in discomfort.

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12-30-2023, 09:16 AM	#4
vfrqqq Ultra Senior Member Join Date: Feb 2014 Drives: 2014 BRZ Premium, WRB Location: East Coast, US Posts: 209 Thanks: 43 Thanked 60 Times in 37 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	I should add that, from the salvage pictures of the donor vehicle, the previous user at least wasn't running any FI and everything appeared to be stock from what I saw in the engine bay. Of course, that says nothing about how it was driven or was running an other-than-factory tune on the ECU.

03-28-2024, 02:22 AM	#8
Muffled Member Join Date: Jun 2021 Drives: 2013 BRZ Location: Ontario Posts: 12 Thanks: 2 Thanked 5 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I thought port injection was supposed to help with exactly this issue?

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