We are racing a Duratec 2.3L, 4 cylinder engine and are experiencing a problem with the engine that at the 6000 to 8500 rpm range the engine will stutter and act like it is misfiring. All of the ecu traces except the injector,shown as time injector is on, and rpm are smooth and look normal. The injector and rpm trace change from a smooth line to a series of short up and down traces that look like static on a dc voltage trace, that correspond to the problem of poor running. We have tried various crank triggers, MAP sensors,lambdas,and temperature sensors. Have had different fuel maps different ecus tried, with no change.I am thinking we have a bad wiring harness or connector, but can not explain why it would only show up in the upper end rpm range.
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