For professional mechanics. I have a 93 buik regal with a 3800. It has no ignition fire. It began with intermittent stalling but would start back up. Then it wouldn't start at all. The control module and coils have proven to be good (tested on another vehicle). It has new cam and crank sensor. Harmonic balancer has no damage to the interrupter rings. PCM is good (tested on another vehicle), Cam is turning and cam magnet is present. Performed a thorough continuity check on all wiring in the circuit from every single point, checks good. Still no fire. What did I miss? Remember, all components in the circuit is good and I'm positive the timing chain is not broken.
Fuses? You have to see if the Ignition module is seeing the crank sensor and is the PCM getting a signal from the Ignition module. These do have a high failure rate for wiring from the crank sensor to the ignition module. Is the module getting power on the Pink wire?
Well, you show that your fingerprints are all over the components, BUT- how about diagnostics? Have you done pin-out tests at the PCM? G.M. has a known failure rate in the harnesses. Have you tested for voltage? Have you checked the vRef for the components? When you turn the key on, does the MIL illuminate? If not, check the fuses and Vpwr for the PCM. If the MIL does illuminate, have you checked for Diagnostic Codes? If you need, e-mail me, and I will see if I can help out!
