1991 Buick Lesabre cam shaft magnet location

The camshaft position sensor is a magnet and reacts to a timing point on the camshaft to send info to the ECM with regard to the cams relative position.

However, I would not focus on the CPS unless you are getting an error code pointing to it, in which case it would most likely be the sensor not the camshaft.

I would suspect fuel pressure, ignition, unless you are getting a specific error code.

im getn a error code of 41.ive changed the crankshaft position sensor,the camshaft position sensor,the coil pack and ignition module.now im just at a loss of what to do.im startn to think the magnet interrupter is gone.and i think thats located on the cam sprocket,let me know if i need to go another route.thanks for the reply.steelfan03

I would find a shop that can scan OBDI cars in live data mode. Check the ignition reference pulse.

Also inspect all wiring connections to the ignition for wear/missing insulation. Have the ign. module tested at most autoparts stores for free.