hhwswn Report post Posted September 24, 2018 I'd like to know what type of fuel injection the Ford Fusion Hybrid uses. (My model year is 2017.) Is it port, direct, or both port and direct? If it is direct only, it will no doubt suffer from the same carbon buildup issues that plague earlier EcoBoost engines, after they exceed 30,000 miles or so. Quote Share this post Link to post Share on other sites
murphy Report post Posted September 24, 2018 I can't answer the question but it is an Atkinson cycle engine, not a more common Otto cycle engine. One major difference is that the intake valve opens before the end of the exhaust stroke resulting in blow back into the intake manifold. Quote Share this post Link to post Share on other sites
lolder Report post Posted September 24, 2018 It's port injection. I don't think the intake valve opens before the end of the exhaust stroke, I think it closes late in the compression stroke. The FFH gets carbon buildup but it usually doesn't cause problems until after 100k miles. 2 hhwswn and Rafat reacted to this Quote Share this post Link to post Share on other sites
hhwswn Report post Posted October 13, 2018 Do you mean after the car has been driven 100k miles, or after the gasoline engine has been driven 100k miles. On my car, the gas engine is on only about half the time. So if the car has been driven 100k, the engine wears as though it has only been driven 50k miles. This also helps prevent the engine from overheating. Quote Share this post Link to post Share on other sites
lolder Report post Posted October 13, 2018 100 K car miles. Its random after that and may never occur. The easiest solution is to replace the throttle body which is an easy back yard mechanic job. I think it costs about $250. The other solution is to clean it but you have to take it off to do that and you have to be careful not to damage the mechanisms while you scrape off the carbon with a wooden tongue suppressor or similar tool. I've never done it, just read about it. Quote Share this post Link to post Share on other sites
ptjones Report post Posted October 13, 2018 With 212k miles I have never cleaned my Throttle body, but I do use injector cleaner 10k-20k miles and get great MPG's. :) Paul 1 Rafat reacted to this Quote Share this post Link to post Share on other sites