My 1990 Buick Riviera engine crank's but does not start?

If your 1990 Buick Riviera cranks but doesn't start, the issue could be related to fuel delivery, spark, or ignition timing. First, check if there's fuel in the tank and that the fuel pump is functioning properly. Next, inspect the spark plugs and ignition system to ensure they are providing a strong spark. If these components are in order, consider issues with the engine's timing or sensors.