I have a lexus ls 400 1998, it turns over but will not fire up, there is a good spark, but you get nothing when you try to start it,

Check to see if timing belt is broke as it is a non interference engine and the computer wont turn on the injectors if it doesn't see cam movement.

Check to see if you getting fuel ck fuses for elec fuel pump,ck fuel pressure with tester rented from auto zone or oreilleys,ck injectors with ohm metter unplug injector ck the injector for resistance should be 12 or ubove.utube has a detailed describtion for testing injectors GOOD LUCK