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DFM disabler released
- Thread starter 66 Galaxie
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Antonm
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Maybe, want to see if there is a scan tool that can confirm (or deny) the statements in post #238 above first though.
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Understand. Just let me know.
ninjaplumber
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fondupot
Member
Cool. I have a similar Launch reader. Not the exact one in the video. I’ll have to look and see if I can do that with mine.
I think Dfm is not active during decel. I think Dfm is a piece of software in the ecm to selectively deactivate, collapse lifters, cylinders. I think decel is a different piece of software. I think decel uses lifter “ collapse” to deactivate cylinders along with fuel cutoff and ignition. So to say decel is not Dfm is correct. In the end I believe cylinders are being deactivated during decel. My guess, how do we find out?
Last edited:
Marky Dissod
Full Access Member
DFM / Cylinder (Valve) Deactivation may - or may not - be active during decels; some yes, some no.
Decel is a subroutine. Decel Fuel Cut Off is another subroutine. Not all decels are DFCOs. Every DFCO is a decel.
Decel is when your foot is off the gas and the TCC is unlocked. A minimum of injected fuel keeps the engine idling.
Closest you can get to neutral without shifting into neutral.
So long as the engine is warm enough, decel can use less than 8 cylinders.
If the engine needs to warm up, decel can use up to 8 cylinders.
DFCO is when your foot is off the gas and the TCC is LOCKED. The road, through the trans, runs the engine.
No fuel injected, yet cylinders still try to suck air through a closed throttle, which is technically engine braking.
DFCO would NOT deactivate any cylinder valves, because there's already decel for 'no engine braking desired'.
DFCO is in the highest gear possible, no downshift.
Powertrain braking is DFCO, PLUS at least one downshift. More downshifts = more powertrain braking.
Hope this helps.
