Rep Power: 151

Direct injection..save you up front but gets you in the back end?

The latest direct injection cars are suppose to be a major improvement in less emission and better fuel milage. Then norm has been to spray the incoming air in the intake runners were the air/fuel charge in pushed into the cylinder over and around the intake valve. Unknown to us, it has helped to keep the intake valve seat and valve clean and somewhat lubricated. It also has kept the injector pintle out of hot combustion gasses.

Now along comes direct injection that injects the fuel into the closed cylinder. So what as a consumer do we get. At 50K, the valve seat is dirty and leaking. The cooked injector tip has baked on crud that the fuel cannot spray thru and even Hell's Kitchen Gordon Ramsay's self-clean oven set on triple clean won't get it off.

What's up with this scenario? ...

 
Rep Power: 519

You worry about injector problems, but DI tech is not all that new (diesel). I'm not worried about that.

I wonder about carbon buildup problems in the ports and intake that other manufacturers are trying to deal with.....
But on that note, I was at the training center a while back, they said they weren't aware of Hondas having carbon problems so far in extensive testing nor real world.
Time will tell....