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Old 07-07-2015, 03:11 PM   #1
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2015 ecoboost

Just got one couple days ago, anything i should know? What about this carbon build up i see mentioned .. Any truth to it?
Thanks for any advice !

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Old 09-04-2015, 04:33 PM   #2
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Car looks great! Congrats on the purchase!


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Old 09-08-2015, 03:22 PM   #3
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Originally Posted by Indiana324 View Post
Just got one couple days ago, anything i should know? What about this carbon build up i see mentioned .. Any truth to it?
Thanks for any advice !

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Yes, every direct injection vehicle will suffer from it since there is no gas going over the valves. You can add auxiliary fueling or a methanol kit to clean them, or take the intake manifold off every 15-20k miles and clean the crap off. having owned and worked on several DI cars, i highly suggest the methanol kit route.
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Old 09-11-2015, 08:01 AM   #4
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What you should know is.... I'm jealous! Nice ride!

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Old 09-11-2015, 08:56 AM   #5
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Yes, every direct injection vehicle will suffer from it since there is no gas going over the valves. You can add auxiliary fueling or a methanol kit to clean them, or take the intake manifold off every 15-20k miles and clean the crap off. having owned and worked on several DI cars, i highly suggest the methanol kit route.
Or just WOT throttle it on a regular basis and clean the carbon right out.

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Old 09-11-2015, 10:38 AM   #6
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Originally Posted by 2011 Kona Blue View Post
Or just WOT throttle it on a regular basis and clean the carbon right out.

Non 🍼and non 🌽fed. I $uck!
That wont do anything as far as cleaning the valves.
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Old 09-11-2015, 10:48 AM   #7
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That wont do anything as far as cleaning the valves.
Oh no? Well, just keep filling it with 93 octane and throw in some fuel treatment for carbon buildup.

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Old 09-11-2015, 10:56 AM   #8
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Oh no? Well, just keep filling it with 93 octane and throw in some fuel treatment for carbon buildup.

Non 🍼and non 🌽fed. I $uck!
Again, this is a direct injection car, there is no gas going over the valves. This is the reason for the carbon build up, and why they need to be actively cleaned.
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Old 09-16-2015, 07:38 AM   #9
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Congrats!
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Old 09-16-2015, 07:56 AM   #10
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Hi Voltwings---I have a dumb question ??????????

I'm asking because I'm probably not the only one that does not know the answer to this.
Does a direct injection engine even have an intake valve?????
I know it has to have some sort of exhaust valve but an intake valve - I Don't know.

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Old 09-16-2015, 07:58 AM   #11
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Yes. Only difference is where the fuel is injected. Also why valves tend to get cruddier with DI motors.
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Old 09-16-2015, 08:09 AM   #12
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Thanks, I found this and it explains a lot.


Well worth watching if anyone is thinking about a direct injected engine of any kind.
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Old 09-16-2015, 08:54 AM   #13
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Excellent video......and not to derail this thread......but is the 5.0 direct injected?
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Old 09-16-2015, 09:03 AM   #14
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Excellent video......and not to derail this thread......but is the 5.0 direct injected?
No, you guys are port injected. If you go look at the top of your intake manifold, you'll see your fuel rail (injecting into the manifold, not the cylinder), and lack of cam driven high pressure fuel pump.
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Old 09-16-2015, 11:21 AM   #15
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My last pickup was the DI EcoBoost, and I've never had more soot at the exhaust pipe. I was constantly cleaning the edges and back half of the chrome tip, and the inside was just greasy solid black ALL the time!
It was not hard for me to imagine what the rest of the exhaust system looked like inside.......
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Old 09-16-2015, 11:27 AM   #16
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My last pickup was the DI EcoBoost, and I've never had more soot at the exhaust pipe. I was constantly cleaning the edges and back half of the chrome tip, and the inside was just greasy solid black ALL the time!
It was not hard for me to imagine what the rest of the exhaust system looked like inside.......
Has little to do with it being DI, its the rich as hell factory tunes that OEMs run because they have to account for all types of people driving the cars in all kinds of conditions. Not letting the vehicle warm up properly, running whatever gas they can find ...
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Old 09-16-2015, 12:21 PM   #17
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Has little to do with it being DI, its the rich as hell factory tunes that OEMs run because they have to account for all types of people driving the cars in all kinds of conditions. Not letting the vehicle warm up properly, running whatever gas they can find ...
I respectfully disagree. I ran only Chevron premium gas in our truck, and always drove it far enough to get warm. The sootiest (is that a word?) it got was after a long day slog on the freeway -- especially after towing our TT for hundreds of miles, when it should have been the warmest and most efficient. I like to keep the chrome exhaust tips nice and shiny, and the 3.5 EB made this all but impossible.
I do LOVE how clean the 5.0 runs......nothing even inside the pipe after 1,000's of miles!
All of the EB guys on the F150 forum comment on the soot in/on their tailpipes. DI engines are well known for sooting up their intake valves and exhausts.......as for the EB in the Mustang, I haven't heard one way or the other if this is a known situation for sooting.
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Old 09-16-2015, 12:38 PM   #18
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You're confusing a DI problem with a turbo problem all factory turbo cars run rich as heck, not uncommon for WOT AFRs to be into the 10s.
Edit* i should say, the dirty intake valves is 100% a DI problem, the dirty exhaust however, has to do with the turbo(s).


Understand, this is hardly apples to apples, but bare with me. This is the factory fueling table for a mazdaspeed 3. Notice in the high load / high rpm rev range how rich it runs? Even in the low rpm high load situation its a 13.0, which is a similar situation that a truck would be in when towing. 13.0 is 1.7 off stoich as i'm sure you know, that's a LOT of unburned fuel making its way out.

The 5.0, being naturally aspirated, obviously doesnt have to run nearly as rich, because the fear of detonation from the turbo just isn't there.
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