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Fuel Injectors are manufactured to operate and last for about 250,000 + miles, but over a period of time harmful deposits can build up around the injector nozzle and inside the injector; clogging the injector filter basket and reducing the amount of fuel being delivered. When the fuel delivery is out of spec, drivability problems exist because the PCM is unable to maintain the proper overall air/fuel ratio.
We visually inspect each injector for broken connectors, broken pintles or other damaged areas. Next we test each injector for leaks at the tip as well as the body. We then electrically test the injector and then we check the spray pattern as seen in the picture.
Then we measure how many CC’s the injectors flow over a specified period of time. All injectors are flowed at different pulse cycles for delivered fuel quantities. As you can see the injectors (prior to cleaning) flow between 20 CC’s and 33 CC’s. That might be the cause of rough idle or poor performance and gas mileage, or the reason it wouldn’t pass smog.
We remove the filter baskets for inspection, as well as the O-rings and pintle caps. They will be replaced with new ones at the completion of the service. Caution, not all pintle caps are removable.
We then place the injectors in the ultrasonic bath, which physically shake deposits loose using sound at a frequency, that resonates with particles, but not the injector bodies because injectors pulse at various frequencies during the cleaning, the cleaning fluid backflushes through the injector and carries the garbage back out.
The injectors are again flow tested for spray pattern and volume. These are the same injectors as seen before, but with the pintle cap removed .The cap is there for protecting the tip of the injector, it does not control the spray pattern. What a difference in the spray pattern from before. Some injectors are designed to spray in a fan pattern and others in a stream.
Then the injectors are flowed again, and look at that the injectors match. Looks good and you will receive the before and after test results on a flow sheet.