Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Please explain DFCO (Deceleration Fuel Cut Off)

trikkonceptz · 08-27-2010, 12:06 PM

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 ..

08-27-2010, 12:06 PM	#1 (permalink)
trikkonceptz Legend in my own mind 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) Thanks: 2 Thanked 14 Times in 13 Posts	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 .. __________________ Thx NoCO2; "The biggest FE mod you can make is to adjust the nut behind the wheel" I am a precisional instrument of speed and aeromatics If your knees bent in the opposite direction......what would a chair look like???