under the dash but its not the obd2
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under the dash on the left side, by the fuses. that should be the diagnostics port
If you mean a GM vehicle that was built during the transition from OBD1 to OBD2, the answer is if it has a OBD port a scanner will work. GM MDI Tech 3 Interface is Dealer Level Diagnostic Tool for Multiple Brand vehicle: GM, Opel, Chevrolet, Saab from vipprogrammer.com
i belive itb is under the drivers seat under a plastic box.
under hood, on fuel rail which is connected to each fuel injector there should be a valve that looks like a tire valve. That is the shrader valve, test fuel pressure there.
A port hole ?