Unscrew the injectors.
Mount the injector on the injector testing and adjustment device and check the injection start pressure.
Check the injector for leaks. Bring the pressure to a value 0.5 kg/cm lower than the injection start pressure. At this pressure, not a single drop of fuel should appear from the injector spray within 15 seconds.
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Checking the injection nozzles (BMW 3 Series E21)
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