1988 Buick Century

The 2.8 vin W doesn't have a cam sensor. Are you sure which engine you have? Sometimes when replace a computer, you have to use the prom out of the old computer. You have everything hooked-up ok? Are there any codes?

My info shows an oil pressure switch in the fuel pump circuit, once you crank it enough to bring up oil pressure, the switch closes and the pump gets voltage. The pump should run regardless of the pump relay or computer. The only problem is, if the computer doesn't see an rpm signal, it won't pulse the injectors. The voltage side of the injectors go hot when you turn the key on, the computer controls the injectors on the ground side. You can look for a pulse on the ground side of the injectors, with the engine cranking.

There should be a purple wire with white tracer, goes from the ignition module to the computer, that carries the rpm signal, without that signal, the computer won't pulse the injectors, the fuel pump relay won't work either, but, with the OP switch in the fuel pump circuit the pump should run anyway. 2.8 vin W

You need to be sure about the injector pulse, I don't know how you checked for pulse? Because of the air plenum covering the injectors, they are hard to get at.

There may be a four wire injector connector on the backside of the air plenum, easier to get at. You can do some testing there. If your not sure of the connector, look at the wiring color. The solid pink wire is B+ for 1 bank, the ground for the same bank is light blue.

The B+ wire for the second bank is pink with black stripe, the ground for the same bank is light green.

If there is spark and no injector pulse, I would suspect the ignition module. If there is spark and injector pulse, then I don't suspect the module. You need to be sure about the injector pulse.

If you don't have a wiring diagram for your vehicle, the autozone site should have one. After you bring up the web page, click on (vehicle repair guides) and follow the links. I believe the wiring diagrams would be under (chassis electrical).