Where is the cam position on a 3100 engine 2000 Malibu?

The camshaft position sensor (CMP sensor) on a 2000 Chevrolet Malibu with the 3100 engine is located on the passenger side (right side) of the engine block, near the front of the engine. It's usually mounted fairly close to the distributor (if your engine has one, some variants of the 3100 might not), and points towards the crankshaft pulley.

However, to be absolutely certain, you should consult a repair manual specific to your vehicle's year and engine. A Haynes or Chilton manual, or even a digitally available service manual (often found online via various automotive forums) would show you a diagram with the exact location. These diagrams are far more reliable than a general description.