Car won't start? 1992 Buick LaSabre

I would assume you never retrieved the codes
& googled them-- to find out the system with the
possible fault
We have had Check Lights for over 30 years,
nothing new there,just remember you have an
OBD1 System (1981 thru 1995) OBD2 (1996 thru 2014)
Put the codes you get into Google along with your vehicle
for the problems & solutions

Is it spark or fuel that quits?I would start with changing the crank sensor as they fail on this model.

it may have jumped timing.

If you have a key with a computer chip inside, you may need to try another key. The ignition lock "reads" the resistance in your key to let the ignition work. If you only have one key you may need to get a new one.

If it is a 3.8 engine change the crank sensor,they go bad on the 3.8 engines.

it is behind the harmonic balancer on the passenger side just replaced mine

the heater core is in a plastic box more or less above the passenger foot well and behind the dash and glove box. generally the dash has to come out, have a shop do this for you. look for a shop which does heating and air conditioning work so they are familiar with pulling dashboards and any shortcuts.

you must have automatic climate control. the fan module is at fault. you need to replace it for these are not repairable sealed units

u got a locked up torque convertor u can unplug the wiring that goes to the transmission for the torque convertor i cant remember with out looking at ur car if u have a sep plug for the computer control functions of the transmission but if u unplug the wiring for just the torque convertor u can drive the car forever like this my car did the same thing and i drove 150,000 miles after doing this or u pay a grand to have torque convertor replaced hope this helps ya

It appears I was incorrect about removing the dash assembly, here are the instructions from a Buick owners club.

Under the passenger dash is an access panel that will allow you to remove the heater core, it really isn't that hard, there are lots of little dash screws and panel screws to remove before you get where you need to be but at least it is roomy. The AC evaporator is located by the heater core. I will give you a tip. I changed mine last year and the heater core that I ordered for my 92 Roadmaster was not correct, when I took my old one out and matched it in a book at the local part store, the heater core for my vehicle was listed as a 96 Caprice???? The car has been in my family since it was purchased new and the heater core had never been changed!!!! Explain that one!Oh yeah, one more tip, if your heater core is leaking, this access panel lowers towards you, if there is nasty sweet smelling water in there it will pour all over you, be careful! Caprice parts are the same as a Roadmaster,so if you ever need anything just look up caprices