Vitaliy wrote: >> Specifically I'd like to know when it detects knocking. > > Typically the ECU would generate a diagnostic trouble code when this > happens. It's my understanding that it will adjust timing and mixture to correct for knocking, and only generate a trouble code if it was not able to correct. -Skip -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist