Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Vacuum hose mod is not a cure or substitute for out of synch TB vacuum... It smooths out throttle response at low throttle opening and lower speed, by transfering some of the vacuum pulse between the two, which also affects Inlet Air Pressure sensor signal while operating in low-speed mode. IAP sensor vacuum hose is on its own left TB's left fitting which has a larger bore.
D-J Method and α-N Method:
When the engine load is light like at idling or low speed, the ECU determines the injection quantity by calculating from the throttle vacuum (inlet air pressure sensor) and engine speed (crankshaft sensor). This method is called D-J method (low-speed mode). As the engine speed increases, and the engine load turns middle to heavy, the ECU determines the injection quantity by calculating from the throttle opening (main throttle sensor) and the engine speed. This method is called α-N method (high-speed mode).
Last edited by invader; 03-25-2014 at 12:59 AM.