Quote:
Originally Posted by 07_civic
The car never cuts off fuel completely - old wives' tale.
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ROTFLMAO. The old wives are writing factory service manuals these days.
K20Z3:
Fuel Cutoff Control
During deceleration with the throttle valve closed, current to the injectors is cut off to improve fuel economy at engine speeds over 1,150 rpm [emphasis mine]. Fuel cutoff control also occurs when the engine speed exceeds 8,200 rpm, regardless of the position of the throttle valve, to protect the engine from over-revving. When the vehicle is stopped, the ECM cuts the fuel at engine speeds of over 7,700 rpm. Engine speed of fuel cut is lower on a cold engine.
R18:
Fuel Cutoff Control
During deceleration with the throttle valve closed, current to the injectors is cut off to improve fuel economy at engine speeds over 910 rpm (A/T model) or 950 rpm (M/T model) [emphasis mine]. Fuel cutoff control also occurs when the engine speed exceeds 6,900 rpm, regardless of the position of the throttle valve, to protect the engine from over-revving. When the vehicle is stopped, the ECM cuts the fuel at engine speeds of over 5,000 rpm. Engine speed of fuel cut is lower on a cold engine.
-mr. bill