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.

(The original text can be read on the website: BMWMAN.ru)