Q: After driving my car, the next day will not start. It turns over but will not start 1993 Lexus LS400

Hello - the first task is to get any problem codes, whether the Check Engine is illuminated or not. The next step is to determine whether you have spark at the plugs, or the fuel pump runs on those days when it won’t start. A failing crankshaft position sensor would prevent spark, and a failed fuel pump relay, or the pump itself, could prevent engine start. I recommend a "no start" inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.