2003 GMC 1500 NO SPARK
VEH WILL CRANK BUT HAS NO SPARK? NO CODES PRESENT. VEH
HAD BAD BATTERY. CHANGED BATTERY AND VEH STARTED BUT DIED
AGAIN WITHIN A COUPLE OF MILES AND WOULD NOT RE-START.
CHECKED INJECTORS WITH NOID LIGHT AND NOID LIGHT FLASHES
WHEN CRANKING ENGINE.
CHECKED PCM FUSES AND THEY ARE GOOD. 12VOLTS TO COILS
AND GROUND IS GOOD. THERE ARE 4 WIRES TO EACH COIL. WHICH
ONE IS THE DRIVER THAT FIRES EACH COIL? ARE THERE ANY
OTHER TESTS THAT I CAN PERFORM?