1989 Pontiac Grand Am cranks wont start

Hi, with the key on, do you have voltage at the injector plug. The computer controls the injector on the ground side. Without the rpm signal, no injector pulse. The rpm signal comes from the crank sensor, dis ignition. Any trouble codes?

If you had a recent post on this vehicle, if you stay on the original post, the person you were talking to will receive an e-mail notice of your post, but, I'm glad to help anyway I can?

23 volts is way too much, should be battery voltage. With key on, maybe 11 volts.

Hi, you need to have the setting on voltage not mv. If that reading is correct, the voltage isn't correct. Take a reading across the battery posts, key on, no crank. Then take a reading at the pink wire with black tracer at the injector. The reading should be close to the same.

What is litre size of engine? Voltage at the injector comes from a fuse, not the computer. If no voltage with key on, check fuses. The injector voltage wire on some, start as pink/black, then may be red at the injector.