How do you adjust valves and or lifters on 1993 Saturn SL1?

Answer 1

You don't. Like many (perhaps most?) modern overhead-cam engines, the valves and lifters are "adjusted" hydraulically, by the engine oil. As long as there is always enough oil in the engine, you don't need to worry about valve adjustment.

If, by chance, you're asking because you are hearing what you think is valve noise, the first thing to do is check the oil. Saturn S-series cars are known to burn oil. A quart of consumption every 500 miles is not unusual. There are ways you can reduce the oil burning, but in the end, it has little to no effect on the car's performance (contrary to popular belief). Still, it's important to check your oil EVERY time you buy gas. Don't let it go more than about a quart low. That should keep the engine running quiet and smooth, and help it last a long time.