too. But the job is not done yet. Many PCMs have to undergo a "relearning" procedure after they have been installed or if they have been disconnected from the battery. On some newer vehicles, a scan tool may be required to reprogram the PCM and to reset the anti-theft system. ...
NOTE:Overadvanted ignition timing can also cause the same thing (spark knock). But on most late model engines, ignition timing is not adjustable and is controlled by the engine computer. The only way to change the timing advance would be toflash reprogramthe PCM. (3) Excessive carbon build...