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Old 03-24-2014, 02:00 PM   #2 (permalink)
ksa8907
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So the best guess I can give is pre-ignition from the higher air temps. I assume you are using a wai?

Does that car use VVT?

Best software I have had experience with is OBD2007 for data logging. I can only suggest cleaning the throttle body and appropriate sensors/air control valves, as well as check/replace spark plugs. Maybe use a higher octane and observe changes.
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