Have a 97 Buick park avenue with 3800 II that I just change the motor with another one just like it cranks and cranks like it want to start but will not im getting gas but no spark what to do is it the crankshaft position sensor

48-59 PSI

No. While the engine would probably bolt right in, there are two entirely different engine control systems for the two models. The '97 engine has OBD-II controls- more and different sensors and controllers, while the '94 engine has the less sophisticated OBD-1 system. They are not interchangeable. An engine from a '94 or '95 park avenue is your best choice. Any from 1996 onward is OBD-II (On Board Diagnostics, second generation).

It could be a bad spark plugs, plug wires or even the coil.

Could be just dirty battery post connections...can you jump start? Do the lights come on? If yes, the terminals are dirty corroded and will not allow enough current to turn the 3800 motor over. Hope this helps.

asd relay or fuse
camshaft not spinning
bad pcm
damaged wiring harness

The car battey on a 1998 Park Avenue series II 3800 is ounder the hood on the passenger side of the vehicle behind the headlight.

It is probably a noisy wrist pin on one cylinder,
also known as "a death rattle"
GM had this in their 2.2 engines,

the motor may bolt up - the fuel line connections - throttle body wire connections and other wire connections will probably not connect - the main difference is on the top side from heads up on the 2 motors - the design change was for 1996 cars

I would seriously have a cat put back on you need that back pressure and have the O2 sensors replaced. Sounds like it may be time for a major tune up

http://www.mvreader.com/multiview/dayco/zoom.php?zoom_item=C0001D&l=n&catalog=auto&category=2 heres the link in case the picture does not show up