Start run a few seconds and shut off sounds like you have a bad fuel pump or plugged fuel filter that has now become worse. Run a fuel pressure test on it to see if you have 41-47 psi at the rail. Run a jumper wire to the pump test wire and see if the pump comes on.
GM did not have a 3.6 in the Buick in 1994, they had the 2.2 or the 3.1.
The 2.2 would be an 8th digit VIN 4 and OBDI with the 12 pin connector shown below. You can read codes without a scan tool by shorting the two top right connectors (A and B) in the test port together with the key off. Then turn the key on and count the flashes. Flash pause = 1 Flash, Flash pause = 2 and so on. Each code flashes three times. It will start with 12 to tell you it is in diagnostic mode, then end with 12 to tell you it is finished. So you would see 12, 12, 12 - 34, 34, 34 - 12.12.12 for a code 34.
The 3.1 could be one of a few versions, depending on what the 8th VIN digit is and when it was actually built.
It could be a VIN T OBDI with the 12 pin connector and can be jumpered.
Or it could be a VIN D OBDI with a 12 pin connector and nothing in the B position and requires a code reader
Or it could be a VIN M which are the 16 pin connector but require the special software to talk to the oddball OBD 1.5 system where they used a mix between both systems.
Take a look at your VIN number to tell which one you have. If it is the oddball you need something like the old Snap-On MT2500 or a Tech 2 both need the correct software and cable. 1994 to 1996 are such fun years.
Monday, January 14th, 2019 AT 9:41 AM