Are there any long term problems with direct fuel injection engines over port injection engines?

Are there any long term problems with direct fuel injection engines over the port injection engines type? Particularly with Subaru's Impreza?

Asked on 20 July 2018 by Tony Hinde

Answered by Honest John
Yes. Because the fuel/air mix is directly injected, it does not enter the combustion chamber via the inlet valves and does not clean them. As a result, carbon can accumulate on the inlet valves. Volkswagen eventually solved this be introducing indirect as well as direct injection to its 1.8 litre and 2.0 litre TSI engines.
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