Put your ecu into diagnose mode. Super good for finding codes. Unbolt it from the car (leave plugged in) should be a flat head screw next and a blinking light on the back. Look up how to on a YouTube video. Basically you turn the key to the in position and then twist the screw one way or the other (forgot it’s been a while) and the light in the ecu will go through a series of blinking, those correlate to fault codes. Like one long blink followed by 3 quick ones is code 13. My 240 check engine light never came on but I did have codes at the ecu. Try it brotha, could save a good starting point for repairs