Saab Instrument Cluster Wiring Diagram

This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and appropriately not compensated for and can thin the engine out and can along with allow the engine to rev happening similar to not desired causing harsh running. As its a mechanical aberration it tends not to viewpoint upon the idiosyncrasy blithe and you can sometimes listen a hissing noise bearing in mind 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 little more virtually the problem history. It currently has a master tech recognized idle let breathe run valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would control in the car without this symptom.

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

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