Compression Ignition Addict
Join Date: Dec 2007
Location: Flint, MI
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The infamous silent deceleration
Ok. I hope all your rigs do this, of similar years ect. While going steady at a medium to high rate of speed say 55 or 70. Cruise on or not, and you just let off. Everything goes quiet, as if the engine stalled. The tach still reads, EVERYTHING functions normally, but I hear no injectors or combustion at all. Until maybe 1500-1700rpms. And if going say 55 or whatever and slow down very quickly the injectors/combustion goes intermittently until 1400 and down to 600 or so rpms. It also does it while going slow like 35 and let off again until the rpms drop to say 1400.
What is that?! I think it is friggin awesome but I don't understand it 100%. I understand engine braking but are the injectors actually "turning off"? And if so does the engine keep running just on compression/centrifugal force? How's it work. Also if it is shutting injectors down, cutting them off whatever to make them not inject does it do that to all 8 or is it the miraculous "cut off 4 cylinders for economy" type of thing like all the new gasser SUV's and trucks. One more thing, this "coasting" effect, is that what the COAST button on the steering wheel does?
PLEASE someone explain this to me.
I just want to know how this system works, it's very fascinating. And I just can't figure out HOW it works, and what it's SURELY doing.
Old Truck: 00 F350 XLT DRW: basic first few mods. S&B, 4" straight pipe, gauges, CCV, EBPV and Wastegate line deletes, LED Sills, sweet custom headlights, smoked cab lights, Ventshades, Tint.
Traded in at 196k miles.
"Brand Newish" Truck: 02 Chevy S10 2.2L 5sp. Reg cab 4x2. Badass custom made shifter, foglights, 20% tint, AVS Vent-shades, Stock Intake mods, Electric Fan conversion .
~ 95k miles.