Electronic Fuel Injection System Components. Throttle and idle/WOT switches, Air Mass Measurement, Small amount of air bypasses the throttle so the engine gets air and will idle. Screw on side of throttle adjusts idle speed. If idle is set too high, the coasting fuel-cutoff with cause the idle to cycle up and down as the ECU cuts fuel until idle drops below spec, then fuel resumes, RPM rise above spec and fuel is cut again. To test, unplug throttle switch or idle switch on units with separate switches. If idle is above spec (1400 for US 528i set it too spec and re-connect the switch.
Compensation flap and damping chamber act like shock absorber allowing door to settle quickly and to make it insensitive to vacuum pulsation’s from cylinders. L-Jetronic System – Fuel Pump. Check fuel pump fuse (fuse #1, 16 amp) for corrosion – common no start or stall failure.Download Here
Saturday, January 2, 2010
L-Jetronic Fuel Injection Systems BMW E12
