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Old 08-27-2010, 01:06 PM   #1 (permalink)
trikkonceptz
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Join Date: Apr 2008
Location: Homestead, Fl.
Posts: 927

Evil Pumpkin - '08 Scion xD RS 1.0 #1633
90 day: 35.45 mpg (US)

Silent Silver Killer - '10 Honda Insight EX
90 day: 51.5 mpg (US)
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Please explain DFCO (Deceleration Fuel Cut Off)

Hey guys,

I know that it stands for Deceleration Fuel Cut Off and I also know that most modern vehicles including my Scion employs it because I see it on my scangauge. However what I would like is a definition of how it works.

Meaning, I still here the engine running while its doing it, despite the fact that it is not getting any fuel (Supposedly), how does that work? Why would it do it while decelerating in gear and not while neutral coasting?

And most importantly how does it restart the engine while rolling and without any bump start feeling?

Thank you ..

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