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The new v6 mustang and v6 camaro engines are direct injected and as a result get sweet mpg and power. Due to the fine atomization of the fuel, these engines can be run leaner than typical fuel injection and not have heat issues associated with lean runs. Also, I have heard that the combustion chamber of a direct injected motor stays clean due to the extreme lean run and total burn of almost all the fuel. I wish Dodge would adopt it.
I cannot speak for the carbon in the intake valve. How does oil and fuel get there to build up? Why do the valves need to be removed to clean them? Can the intake not be removed and then blast the valves with walnut shells?
Check this article as it will better explain it:
Direct Injection Fouls Some Early Adopters - AutoObserver
It's a problem with all DI engines from all makes, MB, Cadillac, Audi, VW, Ford etc.
What's amazing is in the article VW admits that carbon buildup is a problem with the technology but chose to produce FSI engines anyway, as has everyone else. DI is great in the beginning but what they don't tell you is that you'll have to get your intake and valves cleaned every 30K+ miles.
I had an '07 Audi Q7 and an '08 Audi RS4 both with FSI engines. When it was new they made good power but over time the engines started to lose performance. From what I understand it was because of the direct injection technology. Because fuel is sprayed directly into the chambers it no longer washes over the valves. The valves get coked up with carbon very quickly with all Audi FSI engines and is a problem with all other DI engines as well.
Audi at the time was not admitting that this was a problem and wasn't honoring warranty claims. The customer would have to pay to have the intake removed and point at the carbon build up in order to get the intake and valves cleaned up under warranty. They used some sort of device with ground up hazelnut shells to clean up all the carbon.
I've since sold both of my Audis.
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