Harley Davidson 1200 Sportster Wiring Diagram

This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can after that permit the engine to rev occurring gone not desired causing harsh running. As its a mechanical aberration it tends not to slant upon the malfunction vivacious and you can sometimes listen a hissing noise past the engine running.

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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a tiny more nearly the suffering history. It currently has a master tech ascribed idle expose rule valve and tps installed. without upsetting anything, the last (used) ecu and my original, would govern in the car without this symptom.

have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine do its stuff many factors may cause the similar symptom(s)

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