how do I replace the crankshaft position sensor on my 1991 4 cyl beretta?

The instructions say .9 hour labor to replace but the illustration shows only one bolt holding it in and then you just pull it out of the engine block, looks easy. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. and get an online repair manual subscription. Look at www.rockauto.com they usually have a good picture of the part and then you will know what you are looking for.

to add to Pat, the sensor is in a difficult location between the engine and trans. there is a 10mm bolt holding the sensor and a wire connector. carefully twist the sensor before pulling up on it. your neighbor gave you a worse case scenario that if the sensor does not come out, the pan has to be dropped and the sensor driven out. in the 50 or so I have done, only 2 required that to be done. the key is to take your time. I hope you have small hands. it is close quarters to work in. Good Luck Roy