Checking the injectors of the L-Jetronic system (BMW 5 Series E12)

The best way to check the injectors is with the Bosch 6E84.100.202 control device in positions 6-10 of the program switch. If you don't have one, you can check the injectors as follows:

• disconnect the pads from the injectors;
• turn on the ignition;
• check the voltage on both contacts of the connector with a voltmeter. The wiring and the electronic control unit are in good condition if the voltmeter shows the same voltage on both contacts;

Warning: The injectors are designed for 3V.

• attach the pads to the injectors;
• plug the fuel supply line to the starting injector;
• remove the injectors;
• disconnect the wire from the ignition distributor;
• turn on the starter. The injectors should inject fuel at equal intervals.

Note: Do not increase the crankshaft speed with the KDEP 6.35 key inserted into the screw, as this may bend the air flow meter pressure disc lever.

[Information taken from this resource: «BMWman»]