Where are the spark plugs on a 1995 Oldsmobile achieva 2.3 quad four engine?

The spark plugs on a 1995 Oldsmobile Achieva with the 2.3L Quad 4 engine are located on the top of the engine, between the intake manifold and the valve cover. Because of the design of the Quad 4 engine, access isn't completely straightforward. You'll likely need a spark plug socket with a swivel or universal joint to reach them easily. They're somewhat clustered together.

Before attempting any work on your engine:

* Consult a repair manual: A Haynes or Chilton manual specific to your year and model will have detailed diagrams and instructions. This is highly recommended to avoid damaging anything.

* Disconnect the negative battery terminal: This is a crucial safety precaution to prevent electrical shock.

Remember, working on your engine can be dangerous if you're not familiar with the process. If you're not comfortable with this task, it's best to have a qualified mechanic perform the work.