This seminar will describe the L-Jetronic system fitted on E12’s n It will also cover trouble shooting and performance tips. Idle switch is used for coasting fuel-cutoff on later models(E12 79-81). When switch is closed (throttle closed), fuel is cut until engine rpm drops below ECU specified value. 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.

The sensors output changes rapidly around the 14.7 to 1 ratio. This provides a mixture with just enough oxygen to burn hydrocarbons in catalytic converter. n The lambda system controls around this point. The ECU cycles mixture lean and rich slightly. It looks at the average of the lambda signal and adjusts the average of the mixture accordingly.

If you have a 528i, you don't have to worry about this, but if you have a 530i, keep reading. The following describes the process of converting your fuel injection system to the later style Bosch L-Jetronic with lambda control. The object here is to assemble a FI system that is properly tuned, provides good driveability, low fuel consumption, and has minimal emissions. I had my 530i checked for emissions after I retrofitted my L-jet with Lambda control FI system from a 528i. It's emissions are lower without a catalytic converter than what the original specs call for on a 1977 530i. The L-jet with lambda control FI system is leap years ahead of the one on your car now because it actually monitors the fuel/air (stoichometric) ratio rather than assuming it is OK. My performance is up, driveability is much better (my car would flood at high rpm’s when it was cold before I changed to the new system) better fuel consumption, and of course the lower emissions.



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