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Port injection may require a 510-10% 20% increase on cold-start fueling for a faster engine start time. |
Before tuning any fuel mass related items it is ideal to start on pump gas where a known fuel scalar results in a +-10% total trim (STFT + LTFT) at fully warmed up idle.
After flashing the vehicle for the first time, reset the lambda regulation adaptations.
Disable long term fuel trims (STFT).
Using our base table values and the injector characterization data from the injector manufacture the idle should be quite close. Start logging before starting the engine and allow the engine to fully warm up to 208 F with no accelerator pedal input during this period of time. This log should show STFT +-10% throughout the majority of the log. It is normal to see higher negative STFT’s immediately post engine startup.