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Old 06-21-2014, 07:00 PM   #11 (permalink)
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It may be in deceleration mode but the engine is actually off.

Hence fuel cut-off , it is what it implies , it does not limit the fuel it shuts it off.

The engine now turns by the road wheels force on the drive train.

Your ears think its running but its not
your free wheeling at that point.

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Old 06-21-2014, 07:00 PM   #12 (permalink)
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That's because the engine is being run with the wheels (google it if you don't believe me) because they are turning while the car is still moving when you stop though and you cut off the fuel nothing is keeping the engine going. You can't get something from nothing. Like I said in my previous post there isn't a way to what you want to do.
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Old 06-21-2014, 10:19 PM   #13 (permalink)
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So what happens if I pull the Engine fuse while the van is idling? Does it turn back on if I put it back in? Can I turn it off and on with a switch in this way?
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Old 06-21-2014, 10:33 PM   #14 (permalink)
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So what happens if I pull the Engine fuse while the van is idling? Does it turn back on if I put it back in? Can I turn it off and on with a switch in this way?
Isn't this a kill switch?
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Old 06-21-2014, 10:48 PM   #15 (permalink)
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So what happens if I pull the Engine fuse while the van is idling? Does it turn back on if I put it back in? Can I turn it off and on with a switch in this way?
So you'll get out of your car pop the hood and pull the engine fuse then wait for the light to turn green put the fuse back close the hood get back in the car and then go. But you won't just turn the car off???????????
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Old 06-21-2014, 11:14 PM   #16 (permalink)
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To induce fuel cut off without decelerating using neutral or the clutch will cause the engine to stop turning completely until the clutch is released, which is good.

What you can do to induce fuel cut off is a) put the trans in neutral or clutch in b) turn the engine 1 notch down toward off , this will stop the motor, then put the ignition back up 1 notch to the run/on position in preparation for putting it back in gear when the coast is near over c) release the clutch when ready to drive.

Doing it this way you can coast in neutral with the fuel cut off.

I I guess if you wanted you could turn the ignition off in gear , at higher rpm if you wanted but it would not gain as much as neutral would.
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Old 06-21-2014, 11:50 PM   #17 (permalink)
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His van is an automatic so there's no clutch.
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Old 06-22-2014, 12:26 AM   #18 (permalink)
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I was under the impression DFCO still used fuel. And EOC doesn't engine brake the car while DFCO does.
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Old 06-22-2014, 01:05 AM   #19 (permalink)
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If you installed an injector kill switch, you could kill the engine without interrupting any other functions, like radio or fan. When you key back on, you'd get the usual momentary radio drop-out, but then all would return to normal. If you want to avoid multiple uses of the key switch, you could install a push button start alongside the key switch. That way the key could stay unchanged in the "run" position while you cut and restart the engine. But this is really all overkill in an automatic transmission car, because you can't cut the engine in an auto trans car while rolling (EOC, the big FE gains). And since you'd still be using the starter motor. So your best strategy, most cost effective and least expensive with no loss in fuel saving benefits is just to key off and on at lights longer than 10 or 15 seconds.
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Old 06-22-2014, 12:42 PM   #20 (permalink)
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Quote:
Originally Posted by UltArc View Post
I was under the impression DFCO still used fuel. And EOC doesn't engine brake the car while DFCO does.


My grasp on is the engine is "turning" replicating a running motor , accept without any fuel consumption , respectively outputting no torque.
If less fuel is supplied then the idle requires the engine would shut down, If one was to supply less fuel then idle consumes and not cutting it off completely would be wasteful.


not all cars have the DFCO , I think it started showing up on *most* cars around 1999 or 2000

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