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Old 06-26-2017, 02:10 PM   #1 (permalink)
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Deceleration Fuel Cut Off

Does the electronic fuel injection on my 1.2 i-DSI Honda Jazz/Fit GD-5 have a "shut off on overrun" and if so, above what rpm does it work?

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Old 06-26-2017, 02:31 PM   #2 (permalink)
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I'm sure it does, and it normally starts spraying fuel around 900-1500 rpm. If you have it in gear and coast down, you can feel the jerk as it kicks back in.
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Old 06-26-2017, 03:24 PM   #3 (permalink)
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Thanks. I take it I am more likely to feel the jerk in a lower gear?
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Old 06-26-2017, 03:43 PM   #4 (permalink)
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Yes, but it'll also be at a lower speed in a lower gear. You should still be able to feel it in a higher gear.
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Old 06-26-2017, 09:11 PM   #5 (permalink)
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Use a shallow sloping hill and top gear, you'll feel exactly when the fuel comes back in.
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Old 06-27-2017, 12:35 AM   #6 (permalink)
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I like checking in first gear. Much easier to feel the fuel kick back in. Also safer to be staring at the tach at lower speeds.
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Old 06-27-2017, 02:05 AM   #7 (permalink)
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Tried it in third, this morning, and though revs dropped down from 2500 to stalling I felt absolutely nothing!
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Old 06-27-2017, 08:30 AM   #8 (permalink)
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Was the engine warmed up? If you're still in high idle mode, it won't kick in.
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Old 06-27-2017, 11:30 AM   #9 (permalink)
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It had warmed up and tick-over was about 700 rpm, but I'll try it again after a good few miles when engine is really hot.
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Old 06-27-2017, 06:53 PM   #10 (permalink)
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I have a 2000 accord automatic transmission. I use the Torque app with a blue tooth OBD2. Torque has a fuel consumption display. It shows the same amount if I'm coasting in gear or in neutral so it looks like I don't have DFCO. Any other way to see if my car has DFCO

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