Do not have same engine but would like to share 2 very recent mistakes while trying to fix my LO5 engine.
Car would crank but wouldn't start.
Replaced the ignition distributor and rotor (with an old one) - nil fix.
Towed the car back home and troubleshot ...
Found the fuel pump intermitently not operating.
When operating the pressure was 6 psi cwm3 (normal is 9 - 13 psi on my engine) - flow at injectors was not a "spray" but more a water tap appearance.
Replaced the fuel pump (not fun when tank is almost full)
Pressure checked at 12 psi - GOOD
But engine still would'nt start ...
Replaced the ignition distributor again and rotor. While doing that I found that I was not installing the wires properly. Did it again with correct orientation of service manual cwm5 (bad interpretation of shape of the distributor) cwm5cwm5cwm5
Car started just fine ...