These injectors are about a year old, and the last 6 months have been used with e85. The customer was having some tuning and starting issues with the car. Brought the injectors in to take a look. They visually look good, we went ahead and tested them prior to cleaning, they electrically tested okay, we then did a dynamic and static flow test to measure their volume. 2 and 8 were substantially dirty, and fueling was being added in the tune based on the “lean” reading from the wideband which samples all of the cylinders at the same time. We did a pre cleaning in a heated ultrasonic, than loaded them in the injector specific ultrasonic tank to clean and restore the pintle, and injector valve. They were run for two full cleanings while cycling the injectors the entire time. They were removed, dried and retested. Retesting was done dynamically to ensure the injector was functioning properly at different pulse widths, rpm, and voltages. Some injectors will statically flow the correct amount of fuel (held wide open) but have an injector opening or closing problem causing the flow to be much lower (or higher). Once tested to be within a couple percent of each other, they were finally static tested to check the flow rate. The o-rings were replaced, the injectors were dried, and oil applied to the internals for storage/shipping.