Welcome to the North American Subaru Impreza Owners Club Sunday August 1, 2021
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > FA Series Factory 2.0L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 05-07-2021, 10:26 AM   #1
Clmoore3
Scooby Newbie
 
Member#: 505803
Join Date: Aug 2019
Default Walnut Blasting vs. Chemical cleaning valves - help

my car is a 2017 WRX premium, purchased at 40k miles (42.5k current), no clue if previous owner had them cleaned, assume not - no issues except i get a lot of carbon on my exhaust tips (they are completely black right now) ... not sure if this indicates the valves are gunked up? I have called multiple shops and mechanics, posted in various facebook groups, etc trying to find someone near me (Evansville, Indiana) that does walnut blasting. I have been unsuccessful as no one near me does it that ive been able to find.

1 shop said they don't do walnut blasting but do offer a fuel injection cleaning service where they introduce a chemical into the engine that will clean the carbon build up out. I mentioned my car is DI and doesnt have fuel injectors but they said it would still clean it out. When I recently realized that the carbon build up is a thing that needs addressed, everything ive seen has said walnut blasting.

TLDR; will this chemical cleaning im being offered work just as well as walnut blasting to clean the intake valves?
* Registered users of the site do not see these ads.
Clmoore3 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-07-2021, 11:09 AM   #2
numskull50
Scooby Newbie
 
Member#: 373996
Join Date: Nov 2013
Chapter/Region: South East
Location: clearwater fl
Vehicle:
2015 FXT Touring
Quartz Blue Pearl

Default

you can buy CRC intake valve cleaner at any auto parts store. you can also get a media blaster walnut shells and everything at harbor freight plenty of videos on youtube on how to do both.
numskull50 is offline   Reply With Quote
Old 05-07-2021, 11:17 AM   #3
Clmoore3
Scooby Newbie
 
Member#: 505803
Join Date: Aug 2019
Default

The CRC cleaner isnt going to do that great right? How does that and the results of walnut blasting compare to the chemical cleaning a shop is offering me? ($171 if only has to do 1 application, double if 2). You may not know the comparison per se, but im hoping someone here might.

Yeah ive been looking up DIY videos, guess im a little nervous to mess something up.
Clmoore3 is offline   Reply With Quote
Old 05-07-2021, 11:18 AM   #4
MZR2FA20DIT
Scooby Newbie
 
Member#: 426776
Join Date: Jul 2015
Chapter/Region: TXIC
Location: DFW TX
Vehicle:
2016 WRX
lapis blue pearl

Default

No it won’t hardly do anything. At 40k I wouldn’t worry about it too much. My first cleaning was at 80k. The soot on the exhaust is normal, seems direct injection cars have more of that or at least in the ones I have owned.
MZR2FA20DIT is online now   Reply With Quote
Old 05-07-2021, 11:23 AM   #5
Clmoore3
Scooby Newbie
 
Member#: 505803
Join Date: Aug 2019
Default

Quote:
Originally Posted by MZR2FA20DIT View Post
No it won’t hardly do anything. At 40k I wouldn’t worry about it too much. My first cleaning was at 80k. The soot on the exhaust is normal, seems direct injection cars have more of that or at least in the ones I have owned.
First DI car + first modified car. I am looking to do some more mods soon + get a tune so I was thinking i should look into cleaning it prior to that.
Clmoore3 is offline   Reply With Quote
Old 05-07-2021, 11:24 AM   #6
dpetro1
Scooby Newbie
 
Member#: 487500
Join Date: Jun 2018
Location: Catonsville, MD
Vehicle:
2018 WRX

Default

Depends on what chemical process is being used. Running a cleaner through the gas tank won't do anything. Introducing a chemical cleaner via the intake manifold should help. Subaru actually makes a kit for this and is recommended in their service intervals.

Of course some type of physical removal of the carbon is a sure fire way to clean the valves.
dpetro1 is offline   Reply With Quote
Old 05-07-2021, 11:26 AM   #7
Clmoore3
Scooby Newbie
 
Member#: 505803
Join Date: Aug 2019
Default

Yeah, i didnt think running something through the gas was gonna do much. I should (and will do so) clarify what the chemical cleaning process involves.. if they actually introduce it through the manifold/take it off to get to the valves, then i would feel a bit better about it.
Clmoore3 is offline   Reply With Quote
Old 05-07-2021, 06:07 PM   #8
noobultimatum
Scooby Specialist
 
Member#: 431550
Join Date: Oct 2015
Location: South Florida
Vehicle:
2016 WRX
ALL THE STAGES

Default

Run a search on the forums. There are a few threads talking about this subject already that will help you understand dirty valves, walnut blasting, wmi...

Bottom line? Nothing will clean your valves completely except for WALNUT BLASTING THEM. Nothing.

WMI will help maintain the back of the valves by having something spray over the backs of them, but since it isnt spraying all the time, you will end up with build up.

DI motors all suffer from build up on the valves. It comes with the territory.
noobultimatum is offline   Reply With Quote
Old 06-11-2021, 02:36 PM   #9
Rety1-1
Scooby Newbie
 
Member#: 234801
Join Date: Jan 2010
Default

Quote:
Originally Posted by dpetro1 View Post
Depends on what chemical process is being used. Running a cleaner through the gas tank won't do anything. Introducing a chemical cleaner via the intake manifold should help. Subaru actually makes a kit for this and is recommended in their service intervals.

Of course some type of physical removal of the carbon is a sure fire way to clean the valves.
I recently tried cleaning my intake with Seafoam spray I picked up locally and my car (17 WRX stock) has been having really strange issues..
wont boost over 3psi, AFR stays consistently between 13:1 and 15:1, EGT is always about 100 degrees higher than normal, and there's no consistent codes.
I get a P0420 that doesn't actually trigger the CEL and I had a P0137 one day but I cleared it and it never came back.
I'm completely baffled.
I was thinking the seafoam redeposited cleaned carbon onto my spark plugs, and changed them to no avail (I'm at 60k miles so it was time to change them anyway)

Last edited by Rety1-1; 06-11-2021 at 02:41 PM.
Rety1-1 is offline   Reply With Quote
Old 06-11-2021, 03:15 PM   #10
dpetro1
Scooby Newbie
 
Member#: 487500
Join Date: Jun 2018
Location: Catonsville, MD
Vehicle:
2018 WRX

Default

Which seafoam product did you use and how did you introduce it into the engine?

I would check simple things first, like any potential vacuum leaks.
dpetro1 is offline   Reply With Quote
Old 06-11-2021, 04:07 PM   #11
Rety1-1
Scooby Newbie
 
Member#: 234801
Join Date: Jan 2010
Default

the aerosol spray they have for cleaning gasoline direct injection engines. I don't recall a specific product name other than Seafoam.
The directions say to introduce the spray right at the throttle body but that would've been nightmarish to accomplish properly so I slid the tube into the charge pipe going into the intercooler. I only took off that worm clamp to slide the tube inside the coupling and I tightened it back up when I was all done.
I'll check it when I get home to be 100% certain its on correctly and tight.

Edit: It also idles perfectly, the only issues are when the engine is under load.

Edit #2: I wanted to also apologize for hijacking this thread. I didn't have enough posts to start my own and this is the most closely related thread I could find to try and get some kind of information.

Last edited by Rety1-1; 06-11-2021 at 04:30 PM.
Rety1-1 is offline   Reply With Quote
Old 06-14-2021, 02:30 AM   #12
basyager
Scooby Newbie
 
Member#: 518233
Join Date: Aug 2020
Vehicle:
2019 WRX

Default

id just get this kit and DIY it. just make sure the valve is really closed lol
https://subiebros.com/subie-bros-fa2...lnut-blasting/

watch their video. you literaly slap this bad boy onto your heads and blast teh velves
basyager is offline   Reply With Quote
Old 06-15-2021, 03:28 AM   #13
Tinapayboy
Scooby Newbie
 
Member#: 524927
Join Date: Jun 2021
Default

Walnut all the way!
Tinapayboy is offline   Reply With Quote
Old 07-07-2021, 02:19 PM   #14
legacyboy
Scooby Newbie
 
Member#: 408121
Join Date: Dec 2014
Chapter/Region: International
Location: New Zealand (Australasia)
Vehicle:
2012 Legacy GT DIT
JDM

Default

nobody in my country has heard of walnut blasting and we're all driving DI cars.

i think it's optional unless the carbon is causing problems
legacyboy is offline   Reply With Quote
Old 07-07-2021, 02:25 PM   #15
cdska
Scooby Newbie
 
Member#: 458809
Join Date: Nov 2016
Chapter/Region: NESIC
Location: Boston
Vehicle:
05 blob, 02 bug

Default

Quote:
Originally Posted by legacyboy View Post
nobody in my country has heard of walnut blasting and we're all driving DI cars.

i think it's optional unless the carbon is causing problems
all maintenance is optional, some just have more repercussions by not doing than others
cdska is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 12:59 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2021 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.