M56 Carbon Build Up

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ken in az
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M56 Carbon Build Up

Postby ken in az » Thu Mar 26, 2020 8:50 pm

Hi All, just figured I'd share my 115k Mile intake valves.

According to the Service History it is had the Intake Valve cleaning procedure done every 30K miles since before I got it. I literally just did a Dual can (one per throttle body) SeaFoam Treatment and this is what they look like...

Image

Image

I'll be taking pictures and posting a how to for cleaning them.


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Re: M56 Carbon Build Up

Postby madmanpauly » Fri Mar 27, 2020 10:57 am

Yeah, that's the problem with direct injection. Many articles have been written about it. Using sea foam won't help because sea foam runs through the injection system which is injected directly to the combustion chamber and won't clean the top of the valves as conventional injection systems would.

Are you using a particular product to clean it?

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ken in az
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Re: M56 Carbon Build Up

Postby ken in az » Fri Mar 27, 2020 11:20 am

No, I injected the aerosol version of SeaFoam directly into the intake before the throttle bodies and after the mass air sensor.

I did 2 cans since we have dual throttles.

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Re: M56 Carbon Build Up

Postby EdBwoy » Fri Mar 27, 2020 12:59 pm

Oof! And that's the after picture? How was the before state?

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ken in az
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Re: M56 Carbon Build Up

Postby ken in az » Fri Mar 27, 2020 2:26 pm

I didn't get a before image unfortunately. I didn't get my Borescope in time to do a before image.

Honestly I was hoping it would be better, but I have also seen a lot worse.

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Re: M56 Carbon Build Up

Postby hemachayart » Fri Mar 27, 2020 3:33 pm

Spray, Ethylene Glycol into port in this picture. It will be white smoke come out after start but it's ok.

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Ilya
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Re: M56 Carbon Build Up

Postby Ilya » Sat Mar 28, 2020 4:55 am

hemachayart wrote:
Fri Mar 27, 2020 3:33 pm
Spray, Ethylene Glycol into port in this picture. It will be white smoke come out after start but it's ok.
Can you buy that?

OP, how long did you let the car sit with Seafoam soaking? I usually do a ton of it and let it sit for like 45-60 minutes even though most guides say 30.

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Re: M56 Carbon Build Up

Postby hemachayart » Sat Mar 28, 2020 11:25 am


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ken in az
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Re: M56 Carbon Build Up

Postby ken in az » Wed Apr 08, 2020 3:16 pm

Here are my updated Before pics - these were the worst of the bunch. You can see how the carbon is literally piling up on the valves and ports blocking flow.

Image

Image

Image

Image

I used a combination of CRC Intake Cleaner, SeaFoam Aerosol, Brake Cleaner, Toothbrush with trimmed bristles, and a sharp pick.

Let me tell you it was a pain in the neck. I wish I would have done the walnut blasting, but with how slow everything is taking to get delivered these days I decided to just go with the chemicals.

Driving impressions after cleaning, no they aren't spotless and shiny like the walnut lasted intakes, but they are clear from obstruction 98%. First day driving it was still smoking when I lid into the throttle at low RPMs. Burning off the residue of the cleaner and the extra carbon is what I am assuming it was. took a day and a half to stop letting out little white puffs of smoke here and there.

After the smoke cleared, WOW - it drives sooo much better. I notice it most in low throttle to part throttle. No more hesitation, no more hunting for the right gear to be in when going slow. It's like the car woke up from hibernation and is ready to go.

Well worth the time and effort. FYI - it only took me 45min to get the intake manifold off. It's easy enough I'll probably do the walnut shells here in a month or two LOL.

Let me know if you have any questions.

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Re: M56 Carbon Build Up

Postby DFW2011M56S » Fri Apr 17, 2020 8:05 pm

I did my carbon clean and noticed the same thing. I walnut shell blasted. Makes a massive mess of the engine compartment. Little blobs of gummy carbon and walnut shells everywhere.

Mine was actually setting a P0300 code at the time.

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Re: M56 Carbon Build Up

Postby Yoda's Master » Sat Apr 18, 2020 6:43 pm

Request diy when you walnut blast

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Re: M56 Carbon Build Up

Postby Ilya » Sat Apr 18, 2020 7:19 pm

Yes, please do a DIY.

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Re: M56 Carbon Build Up

Postby DFW2011M56S » Wed Apr 22, 2020 10:00 pm

I did the walnut shell blast after loosening the deposits with a good soaking of B12. Finished the job with one of those metal dentist picks to remove the ring of gummy carbon left behind on the valve seats.

I had previously used two different chemical cleaners. The chemicals failed to reach the front 4 cylinders because the PCV ports for those cylinders were plugged with gunk in the manifold. I cleaned the manifold and got all 8 pcv ports flowing properly again. Car ran like new after. Even with 90+K mile plugs.

I used GM top engine clean through a vacuum powered dripper every 5K right before changing the oil after that. Half the can into the PCV valve hose on each bank. When I pulled the intake to change my starter solenoid at ~115K they were still virtually spotless. I think the Mobil One I was running helped alot as well as it does not sludge the valves as badly because it is more resistant to coking with high heat. Previous owner was running dinosaur oil in it. I think a few more treatments would have gotten the valves clean on the rear 4 cylinders. It cleaned the heck out of the ports. The residual just ended up gunked up on top of the valves. If it had been done regularly from low mileage through the PCV ports the passageways on the front cylinders never would have clogged up either. If you look at the intake manifold you will notice both sides have a rail that looks similar to a fuel rail. Each rail has a hole drilled through it or cast through it into the manifold runner for each cylinder to evenly distribute the PCV gasses. CRC makes a cleaner that works very well that comes in an aresol can. I think a can into each bank every 200 miles or so would probably clean up most if not all of this over several treatments but it would be a crap shoot without pulling the manifold to see what is happening.
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Re: M56 Carbon Build Up

Postby ken in az » Thu Apr 23, 2020 1:16 pm

I'm going to try the commercial version of the BG Platinum Air Intake, Valve Cleaner - https://www.bgprod.com/catalog/gasoline ... r-cleaner/

Here's a video of it in action by The Car Wizard on Youtube. He uses it on an Audi/Lambo V10. - https://youtu.be/8zmXyB38mRg

Using the PCV hoses on the intake behind the Throttle Body is a great idea. That hose connects to each individual Intake port so the cleaning solution should get to all the valves - here, check out this video, please don't mind my heavy breathing as my allergies have almost turned me into a mouth breather LOL

https://i.imgur.com/0tKxMXt.mp4

I imagine solution being pulled in and distributed evenly, like little injectors for each cylinder's valves.

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Re: M56 Carbon Build Up

Postby Oleg92 » Sat Apr 25, 2020 3:17 pm

I dont have that much expertise like you guys do?

I am at 70k and never done it.

Looks concerning. how much would that cost at a regular shop to do ?

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Re: M56 Carbon Build Up

Postby Malbec 56 Beast » Sat Apr 25, 2020 4:49 pm

BG44k is awesome stuff
Oil changes fuel and opening it up can help keep this buildup down. 3M makes a great fuel additive that works great

Andy

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Re: M56 Carbon Build Up

Postby DFW2011M56S » Sat Apr 25, 2020 9:32 pm

Malbec 56 Beast wrote:
Sat Apr 25, 2020 4:49 pm
BG44k is awesome stuff
Oil changes fuel and opening it up can help keep this buildup down. 3M makes a great fuel additive that works great

Andy
Fuel additives or top tier fuel will not help a bit for this problem. Fuel does not flow over the valves or through the ports.

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Re: M56 Carbon Build Up

Postby AZhitman » Sat Apr 25, 2020 9:37 pm

^ Correct. These are direct injection engines.

We had the same issue on my wife's '13 Mazdaspeed 3. We did the walnut shell blasting.

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Re: M56 Carbon Build Up

Postby DFW2011M56S » Mon Apr 27, 2020 6:52 pm

AZhitman wrote:
Sat Apr 25, 2020 9:37 pm
^ Correct. These are direct injection engines.

We had the same issue on my wife's '13 Mazdaspeed 3. We did the walnut shell blasting.
Yea direct injection sucks for carbon buildup. Even my stock port injected 3.5HR was far from clean at 178K miles when I did the plugs. I had to do the valve covers today at ~216K. I have been running revised cam timing maps with much less cam overlap than stock for about 5,000 miles in that car with the free flowing exhaust. I have used Techron a few times this year which actually gets to the ports and valves. On that port fuel injected engine this was what greeted me today.

Also 60K worth of synthetic oil changes with a Mobil One filter every 6K have the 3.5 spotless inside. I highly recomeend Mobil One, Penzoil Platinum or Amsoil for these high reving, high horsepower, massive heat building cars.

M35H and M37 guys can use Techron or top tier fuels like Shell or Chevron premium and get a valve cleaning benifit from them.
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Re: M56 Carbon Build Up

Postby AZhitman » Mon Apr 27, 2020 9:37 pm

Right - But as you stated earlier, additives or fuel will not help a bit for this problem. Let's be sure not to confuse those who don't understand the difference. :)

Motor looks squeaky clean!

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Re: M56 Carbon Build Up

Postby DFW2011M56S » Tue Apr 28, 2020 12:58 am

AZhitman wrote:
Mon Apr 27, 2020 9:37 pm
Right - But as you stated earlier, additives or fuel will not help a bit for this problem. Let's be sure not to confuse those who don't understand the difference. :)

Motor looks squeaky clean!
I get you.

Thats why I specifically said M35H and M37 owners not M56 owners. Don't want those guys thinking their valves will look the same way as the 5.6VD direct injected engine.


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