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- State of Jefferson
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- 2017 CX-5 GT AWD+
This could be one of two different things: 1) The engine de-tuning itself due to heat soak by pulling timing. This isn't a huge loss of power and doesn't constitute a safety issue. 2) A rare condition in turbo engines where prolonged exposure to very high humidity while running at a steady light load for a long time can induce a false misfire condition that throws the engine into a sort of limp mode. This *is* a huge loss of power and it feels like the engine has been caught completely flat foot and is dead. It also can be a real safety issue if it happens during 2-lane passing. I had this happen to me exactly once when I owned my Hyundai Veloster Turbo. After driving for hours in the rain at 100% humidity I needed to pass a car. After a moment of acceleration the engine just went dead and stuttered like it was running out of gas. It took about 10 seconds before it began to come back and pull again, and the ECU had pulled timing as much as it possibly could so there wasn't much power there still. My father's 3.5 EcoBoost F-150 also did this to him exactly one time under similar circumstances. It's rare but it's a thing.
My guess was usually that the waste gate was stuck open for some reason, that's what it would feel like. But it could have easily been a timing issue. Mine never went dead like yours. It was somewhere in between.
The dealer would never tell me what they did to fix it, but they finally did after three tries, and getting the company's engineers involved. I do know that the next year [and every year after] that engine was seriously detuned from mine [first year of the Subaru Forester turbo, 2004]. C&D tested mine 0-60 at 5.3, but it was in the 7s every year after that.
Thanks for your input.