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Old 02-17-2015, 10:26 PM   #1
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Direct Injection article in Consumer Reports

"Although the breakthrough seems like a dream come true, an unwanted side effect has been emerging. Letter writers have complained to Consumer Reports and the National Highway Traffic Safety Administration (NHTSA) that over time DI can lead to clogged fuel systems and engine carbon buildup. The result can be engine hesitation and a loss of power—and the need for expensive repairs."

https://autos.yahoo.com/news/direct-...193000698.html


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Old 02-18-2015, 06:00 AM   #2
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i suppose time will tell on our cars, they have only been around ~3 years. 55K on mine with no issues yet that I can tell.
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Old 02-18-2015, 06:16 AM   #3
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The article also mentions companies posting TSBs as well as the recommendation of E0 fuel.
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Old 02-18-2015, 07:06 AM   #4
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Just a reminder: Ford has yet to approve any method of cleaning potentially dirty valves in both the EcoBoost engines as well as our NA DI engines. Walnut shells, spray cleaners, and manual scrubbing are all no-nos in the eyes of Ford and they may void the warranty.

According to makuloco, though, Ford is working on this and will likely provide a TSB or an approved cleaning method:

Ford Ecoboost Engine Carbon Deposits: What You Need to Know
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Old 02-18-2015, 09:19 AM   #5
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I have a feeling this concern is way overblown. Maybe it's only a real problem on the early-adopting specialty engines like the 2006 VW 2.0T engine referenced in the article (suspiciously, the only reference given).

This article seems to confirm it's only a known problem so far with early VW/Audi engines:
http://www.autoguide.com/auto-news/2...-engines-.html
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Old 02-18-2015, 09:44 AM   #6
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Quote:
Originally Posted by kam327 View Post
This article seems to confirm it's only a known problem so far with early VW/Audi engines:
http://www.autoguide.com/auto-news/2...-engines-.html
For the time being Karesh said that according to his data, “Clearly it’s a VW/Audi problem and not much else.” Elaborating he also said, “We’ve got other direct-injected engines and it’s not showing up for those.”

He is just dead wrong. Visit the BMW forums. Or the Mini forums. AFAIK, BMW was the first to develop the walnut shell blasting protocol. Brian has also confirmed the problem with Ford Ecoboost.

The problem with carbon buildup is there is no light on the dash that says "Service Engine Soon-Carbon Buildup" It is insidious with gradual power loss, rough cold idle, etc. No codes are thrown.

Driving patterns are a huge influence on this issue as well. Extended idling in traffic for example vs. cruising at 70 down the interstate. Why do you think Ford kept the revs up in their original torture test of the Ecoboost? High intake velocities coupled with high heat kept those intake valves cherry red to burn off carbon.

The article made not one mention of oil which is a known contributor to intake valve carbon fouling.
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Old 02-18-2015, 10:29 AM   #7
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Has anyone with the NA actually reported any issues?
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Old 02-18-2015, 11:13 AM   #8
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The problem is nobody with a NA focus is doing regular dyno pulls. I wish i had the money, to get a baseline one now, and every 20k after.
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Old 02-18-2015, 11:49 AM   #9
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I've put 111,000 on mine and power seems to be the same as when it was new. 5000 mile oil changes with motorcraft semi-syn and have only had to fill tank with e10 maybe 10 times. The rest have been e0.
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Old 02-18-2015, 12:21 PM   #10
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This is a non-problem for worrywarts to worry about.
So far one person, maybe two have decided this is a problem to be on the Ford Focus 2.0. No one has actually HAD the problem so far with it four years on..
IMO it is something for folks who love to worry to worry about.
It is true other engines have had problems.
The valve timing overlap is designed to 'solve' the issue. Why assume it will fail to do so? So far no problems.
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