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This seminar will describe the L-Jetronic system fitted on E12’s, It will also cover trouble shooting and performance tips. Basic Engine Combustion Process, Combustion Requirements, Fuel Delivery Implementations, Electronic Fuel Injection System Components, Understanding these requirements will help explain the L-Jetronic components and their role in the injection system. 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. I replace every 2 years and clean the fuse holder contacts. L-Jetronic System - Cold Start, Extra fuel is required during cold start. Cold start valve is operated for up to 30 seconds by thermo-time switch.
Tags : electronic fuel injection, bmw e12, jetronic fuel injection, process combustion, fuel injection system, electronic fuel injection system, fuel injection systems, shock absorber, engine combustion, fuse holder, mass measurement, l jetronic, throttle switch, check fuel, performance tips
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