Injector testing

This section includes injector testing, and also injector cleaning.
First up, we did electrical testing. We found four injectors, and tested their resistance according to the specification of each. We also tested earth leakage to the shell of the injector. Before this was done though, we hadto check the internal resistance of the multimeter used, and then subtract that from our total reading. On each of my four injectors, my resistance readings were within spec, and none of them had any earth leakage.

My readings were as follows:

       Injector 1: 13.9
              Spec: 13.9
Earth Leakage: OL

       Injector 2: 13.9
              Spec: 13.8
Earth Leakage: OL

       Injector 3: 13.8
              Spec: 13.8
Earth Leakage: OL

       Injector 4: 13.9
              Spec: 13.8
Earth Leakage: OL

If these readings were not within specification, they may cause incorrect opening/closing, or may cause them not to operate at all.

After these were completed i began bench testing the injectors on specialist equipment used for testing/cleaning injectors.
I tested leakage and flow on each of my four injectors. For flow, i hadto test over 15 seconds, and then multiply that figure by four to get my reading. I hadto do this as if i had simply run the test over a minute, the test tube would have overflowed.

My readings are as follows:

Injector 1: Flow = 190cc
                Leakage = 0DPM (Drips Per Minute)

Injector 2: Flow = 190cc
                Leakage = 0DPM

Injector 3: Flow = 190cc
                Leakage = 0DPM

Injector 4: Flow = 190cc
                Leakage = 0DPM

On the earth leakage test, pressure is held behind injectors with them closed, and leakage is observed and determined over a minute.

If flow is below specification, the injector may cause its cylinder to run lean, and cause a lack of performance/fuel economy. If leakage is present, it will cause unwanted drips while engine is inactive, and cause fuel build-ups in the runners of the engine.