1997 CHEVROLET K3500 7.4L 454 NO START NO SPARK NO TACHOMETER
Asked by UPpartsgirl89 Mar 22, 2024 at 12:54 PM about the 1997 Chevrolet C/K 3500 Chassis Cheyenne Regular Cab RWD
Question type: Maintenance & Repair
WE HAVE TRIED EVERYTHING WE CAN THINK OF. WE'VE REPLACED THE
PCM, ICM, DISTRIBUTOR CAP AND ROTOR, WE'VE CHECKED FOR GOOD
GROUNDS, TRUCK HAS NO SPARK, NO TACHOMETER, AND WE ARE AT A
LOSS. ARE WE MISSING SOMETHING?
4 Answers
What does the live data show? Open circuits, shorted circuits.
Is the distributor getting power. When cranking you should have 12 volts at the distributor. With the ignition switch in the run position you should have about 6 to 8 volts. Did you have the new PCM programmed to the vehicle using your VIN? Jim
Another thought, is this a security system problem, if equipped? Jim
If you have no spark it is most likely a problem with the distributor. The tach signal is directly tied to the ignition control module in the distributor. It could also be the pick up coil in the distributor.