Dirty throttle body - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

AVOturboworld · 08-30-2012, 07:47 PM

While pulling the stock inlet tube off after about 400 miles (for installation of the AVO Inlet Tube), saw this buildup already in the throttle body.

It's that black line running along there.

It was easy enough to remove, I just put some brake cleaner on a rag and wiped it off with a bit of elbow grease.

It does make me wonder how effective the standard Toyota air filter is, given that it has only been 400 miles, and it's not exactly pollution heavy here in Seattle. Checked the inside of the inlet filter, and it's not from blow by oil.

Keith@AIRAID · 08-30-2012, 07:51 PM

The PCV vents right in front of the TB, could it be oil from that?

Apex Chase · 08-30-2012, 07:58 PM

Quote:

Originally Posted by Keith@AIRAID

The PCV vents right in front of the TB, could it be oil from that?

Gotta get a catch can from Day 1.

AVOturboworld · 08-30-2012, 08:00 PM

I was thinking it would be that - Subaru's are just a touch notorious for blow-by - but there's not even a hint of oil on the bottom of the standard inlet nor the throttle body. Wiped it down just to check.

gmookher · 08-30-2012, 08:03 PM

any logic in reloc'ing the pcv?

Tradewind · 08-30-2012, 08:27 PM

Quote:

Originally Posted by AVOturboworld

I was thinking it would be that - Subaru's are just a touch notorious for blow-by - but there's not even a hint of oil on the bottom of the standard inlet nor the throttle body. Wiped it down just to check.

As someone who works with a lot of Subaru NA H4 with added FI - I can definitely agree with that

zoomzoomers · 08-30-2012, 08:34 PM

Should have checked when I installed my Airaid intake. I'll make sure to check the next time I have the tube off.

vubaru · 08-30-2012, 10:25 PM

Thanks for the heads up Paul! This is definitely worth knowing early so we can keep an eye on it and clean it going forward.

arghx7 · 08-30-2012, 10:46 PM

it's just a slight deposit; nothing to worry about on a stock or mildly modified vehicle. They all do that. The electronic throttle will compensate for it at idle.

Swift Racing Technologies · 08-31-2012, 12:57 AM

Keep in mind that the factory uses a thick dye to mark where the throttle plate comes in contact with the TB during assembly for calibration purposes. From what it looks like in the pic, it is the factory dye you are looking at and it takes considerable more "elbow grease" to remove that dye than normal blow-by that causes TB contamination. Looking at the picture after cleaning I would say 99% sure you were removing the dye as there is still residue left after cleaning which definitely in not blow-by as blow-by would have easily melted off with brake cleaner and left you a pristine clean surface on such a low mileage car.

gmookher · 09-06-2012, 12:49 PM

i dont think you need to over think this, I added a generic oil catch from Moroso today..

http://www.ft86club.com/forums/showt...ight=oil+catch

KalbiCool88 · 05-11-2016, 10:58 AM

Bumping an old thread here, but I recently installed my TRD air intake and saw this same scenario with black soot or carbon in my throttle body during install. Was a little concerned at first, but eventually just let it go. Glad to see its nothing out of the norm especially since I've only got just under 10,500 miles...

Sent from my A0001 using Tapatalk

08-30-2012, 07:47 PM	#1
AVOturboworld Join Date: Jan 2012 Drives: 2013 "AVO Orange" FR-S Location: Seattle, WA Posts: 1,067 Thanks: 69 Thanked 2,277 Times in 636 Posts Mentioned: 108 Post(s) Tagged: 2 Thread(s)	Dirty throttle body While pulling the stock inlet tube off after about 400 miles (for installation of the AVO Inlet Tube), saw this buildup already in the throttle body. It's that black line running along there. It was easy enough to remove, I just put some brake cleaner on a rag and wiped it off with a bit of elbow grease. It does make me wonder how effective the standard Toyota air filter is, given that it has only been 400 miles, and it's not exactly pollution heavy here in Seattle. Checked the inside of the inlet filter, and it's not from blow by oil.

08-30-2012, 08:34 PM	#7
zoomzoomers Senior Member Join Date: Nov 2011 Drives: 2013 Subaru SWP BRZ Limited 6AT Location: Darkside Posts: 1,862 Thanks: 526 Thanked 305 Times in 207 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Should have checked when I installed my Airaid intake. I'll make sure to check the next time I have the tube off. __________________ Man Law#17:A man in the company of a hot, seductively dressed, woman MUST remain sober enough to fight! MODS: AVO tubes + filter, Cusco (F) strut brace w/ MC brace, Perrin CBE, Subaru OEM trunk tray, Grimmspeed front license re-locator & hood struts and Beatsonic rear cam.

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08-30-2012, 07:51 PM	#2
Keith@AIRAID Join Date: Jun 2012 Drives: 51 Kaiser, 97 4Runner, 07 Civic Si Location: Phoenix, AZ Posts: 93 Thanks: 46 Thanked 118 Times in 50 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The PCV vents right in front of the TB, could it be oil from that?

08-30-2012, 08:00 PM	#4
AVOturboworld Join Date: Jan 2012 Drives: 2013 "AVO Orange" FR-S Location: Seattle, WA Posts: 1,067 Thanks: 69 Thanked 2,277 Times in 636 Posts Mentioned: 108 Post(s) Tagged: 2 Thread(s)	I was thinking it would be that - Subaru's are just a touch notorious for blow-by - but there's not even a hint of oil on the bottom of the standard inlet nor the throttle body. Wiped it down just to check.

08-30-2012, 08:03 PM	#5
gmookher Banned Join Date: Aug 2012 Drives: VortechSC,BorlaEL,Perrin,GCRace Location: HighHeatHighAltitudeAZ,USA Posts: 2,254 Thanks: 458 Thanked 669 Times in 394 Posts Mentioned: 9 Post(s) Tagged: 2 Thread(s)	any logic in reloc'ing the pcv?

08-30-2012, 10:25 PM	#8
vubaru Now with Boost! Join Date: Aug 2012 Drives: 2013 SWP BRZ Ltd. Location: Bay Area, CA Posts: 415 Thanks: 281 Thanked 424 Times in 257 Posts Mentioned: 24 Post(s) Tagged: 0 Thread(s)	Thanks for the heads up Paul! This is definitely worth knowing early so we can keep an eye on it and clean it going forward.

08-30-2012, 10:46 PM	#9
arghx7 Senior Member Join Date: Nov 2011 Drives: car Location: cold Posts: 599 Thanks: 72 Thanked 607 Times in 185 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	it's just a slight deposit; nothing to worry about on a stock or mildly modified vehicle. They all do that. The electronic throttle will compensate for it at idle.

08-31-2012, 12:57 AM	#10
Swift Racing Technologies Join Date: Jun 2012 Drives: 2013 Scion FR-S Location: Boostville, MD Posts: 149 Thanks: 126 Thanked 321 Times in 78 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Keep in mind that the factory uses a thick dye to mark where the throttle plate comes in contact with the TB during assembly for calibration purposes. From what it looks like in the pic, it is the factory dye you are looking at and it takes considerable more "elbow grease" to remove that dye than normal blow-by that causes TB contamination. Looking at the picture after cleaning I would say 99% sure you were removing the dye as there is still residue left after cleaning which definitely in not blow-by as blow-by would have easily melted off with brake cleaner and left you a pristine clean surface on such a low mileage car.

09-06-2012, 12:49 PM	#11
gmookher Banned Join Date: Aug 2012 Drives: VortechSC,BorlaEL,Perrin,GCRace Location: HighHeatHighAltitudeAZ,USA Posts: 2,254 Thanks: 458 Thanked 669 Times in 394 Posts Mentioned: 9 Post(s) Tagged: 2 Thread(s)	i dont think you need to over think this, I added a generic oil catch from Moroso today.. http://www.ft86club.com/forums/showt...ight=oil+catch

05-11-2016, 10:58 AM	#12
KalbiCool88 Senior Member Join Date: Feb 2015 Drives: 2005 SLK350, 2015 RS 1.0 FRS Location: SF, USA Posts: 452 Thanks: 459 Thanked 181 Times in 120 Posts Mentioned: 0 Post(s) Tagged: 1 Thread(s)	Bumping an old thread here, but I recently installed my TRD air intake and saw this same scenario with black soot or carbon in my throttle body during install. Was a little concerned at first, but eventually just let it go. Glad to see its nothing out of the norm especially since I've only got just under 10,500 miles... Sent from my A0001 using Tapatalk

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