1991 Buick Lesabre car wont crank

Hi 88vette88, Welcome to 2carpros and TY for the donation

Pick your symptoms and get back with some testing results

Cranks but no start condition:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems
with compression and valves opening and closing at the wrong time/broken or jumped timing
belt/chain.

No crank at all/nothing/nada when key is engage to starting position

Could be a blown fusible link, the starter, starter relay, clutch switch/park and neutral switch/transmission position switch and ignition switch assuming the battery and connections are good. Note:If it doesn't apply disregard.

Reviewed your question again-No spark

No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.

You don't have a starter relay-check and test the park and neutral switch and ignition switch

When you shorted the small terminal to the battery terminal on the solenoid this will cause the starter to engage the engine did it? If so -check both switch above-its beginning to sound like ignition switch due to no spark-try this 1st

Before you do that have a helper to hold key at starting position and check for power at the yellow wire on the park and neutral switch at rear of engine left side of transaxle-no power here replace the ignition switch its gone

Also check fuse no.7 at underhood fuse block

No its not the same-see below and Good LUck

Disable the Supplemental Inflatable Restraint (SIR) system as described in MAINTENANCE PROCEDURES/AIRBAG SYSTEM DISARMING prior to working on or near the steering column.

Remove steering wheel as described in STEERING WHEEL.
Remove turn signal switch as described in TURN SIGNAL SWITCH.
Remove key from lock cylinder, then remove buzzer switch from column housing.
Reinsert key and turn lock cylinder to LOCK position, then remove lock cylinder retaining screw and lock cylinder, Fig. 2.
To install, rotate lock cylinder to the stop while holding housing. Align cylinder key with keyway in housing, then push lock cylinder into housing until fully seated.
Install lock cylinder retaining screw.
Install buzzer switch, turn signal switch and steering wheel.
Rearm airbag system as described under MAINTENANCE PROCEDURES/AIRBAG SYSTEM DISARMING.

Did you check the theft deterrent relay if so and its good the problem is coming from the computer-look at the diagram I gave earlier on the starting system