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suspenceful's Avatar
suspenceful suspenceful is offline
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Posts: 805
Join Date: Mar 2014
Car: 2008 BSM 135i
Default How-To Walnut Blast/Carbon Clean N54 Intake Valves - 05-09-2019, 02:18 PM

I finally set aside some time to give my 335i the walnut blast it deserved at 140k miles. I want to share my process/results!





Here are the supplies I used:
Here are the steps I took to get to the valves...

Step 1: https://bit.ly/2JvZ98O
Step 2: https://bit.ly/2Yn6rQr
Step 3: https://bit.ly/309uSCo
Step 4: https://bit.ly/309komL

Let's get started...











Well, I think I figured out why the car couldn't eclipse 13's in the 1/4 mile! I couldn't believe what I found after removing the intake manifold!



After loosening up some of the carbon with a pick...





Then after one pass of walnut blasting...
(see video at the bottom for a detailed explanation of how to do this part)



Lots of walnuts and manual scrubbing later...



I even cleaned up the intake manifold ports because those were caked with carbon as well. You can see the cleaned port on the left and the dirty port on the right.



It was a lot of work, but totally necessary. If you want to watch my whole process with more of a DIY/How-To style, check out my YouTube video. It also has some more information and a drive at the end showing the power increase/restoration.

https://www.youtube.com/watch?v=RTt_wEwVpl8

I hope this helps other N54 enthusiasts!


🚀 My 750HP 135i build: my1series.com
🔧 My budget 335i build: bmw335i.com
📷 Follow me on Instagram: instagram.com/jakespence
🎬 Watch me on YouTube: youtube.com/jakespence135
🌟 Support me on Patreon: patreon.com/jake_spence
🏁 Shop BMW merchandise: bimmerstreet.com
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beetle6986 beetle6986 is offline
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Join Date: Jun 2019
Car: e90 335xi
Default 07-17-2019, 04:47 PM

Nice job. I did the same thing a few months ago. It definitely helped the rough idle.


08 335xi - 6MT. JB4 ISO, map7, MHD E85 BEF, E50, DCI, VRSF p1p3s, VRSF FMIC.
04 Cobra - Intake, Borla/Bassani exhaust, FMIC, pulley, tune.
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suspenceful's Avatar
suspenceful suspenceful is offline
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Car: 2008 BSM 135i
Default 07-18-2019, 08:45 AM

Quote:
Originally Posted by beetle6986
Nice job. I did the same thing a few months ago. It definitely helped the rough idle.
Nice! I'm starting to get a rough idle again, seems like my injectors are leaking now...


🚀 My 750HP 135i build: my1series.com
🔧 My budget 335i build: bmw335i.com
📷 Follow me on Instagram: instagram.com/jakespence
🎬 Watch me on YouTube: youtube.com/jakespence135
🌟 Support me on Patreon: patreon.com/jake_spence
🏁 Shop BMW merchandise: bimmerstreet.com
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beetle6986 beetle6986 is offline
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Car: e90 335xi
Default 07-18-2019, 09:05 AM

Quote:
Originally Posted by suspenceful
Nice! I'm starting to get a rough idle again, seems like my injectors are leaking now...
I replaced my injectors with index 12 a few days after doing the walnut blasting. That definitely helped resolve occasional misfire codes


08 335xi - 6MT. JB4 ISO, map7, MHD E85 BEF, E50, DCI, VRSF p1p3s, VRSF FMIC.
04 Cobra - Intake, Borla/Bassani exhaust, FMIC, pulley, tune.
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