![]() They used positive values within a “Load Compensation” table to increase the final Calculated Load value, which has the net effect of artificially increasing fueling, as injector pulse width will be increased to match the new faux Load value. While not immediately harmful, this often causes an annoying feel for the driver and passengers and greatly decreases the overall quality of the daily driving experience.įrom the factory, Subaru attempted to address these lean misfire events via a tuning or ECU-side workaround. The stumble comes from the intermittent lean misfiring and the overall inconsistent fueling. ![]() One of the results of this phenomenon is noticeable stumbling or interruptions in power delivery, especially under light loads and normal “cruising” speeds. These stumbles most visibly demonstrate themselves as a high positive fuel trim (AF Correction #1), indicating a lean air-fuel ratio. Since their inception, one of the great mysteries of the 2008+ STI has always been the issue of the “2800 RPM” stumbles. ![]() By Marshall on 2008+ STI Fuel Pressure Regulator Kit Update – Technical Overview
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