i replaced my 2004 325 motor with another from the same year. i reused most of my sensors and coils from my original motor. the original motor was running just had a knock. my scanner recognizes cam and crank signals, and all guages are working. i had a security light on but did the key cycle on/off to remove it. i have power to the coils but have no spark. i would say its security but as far as i can tell thats cuts fuel not spark. this is on my 2004 silverado and i am at witts end. any suggestions would be appreciated.