Chrysler 300m 81,000. The car ran prior to me changing the senor, it took a while to turn over, i would have to turn the key and hold it for a few seconds then it would start.

I checked code which was a po344 so I changed cam sensor with aftermarket sensor. I started the car and let it run for a few seconds and then I cut it off, I did this twice.

I then torqued the upper intake bolts to spec and put the air box back on then I tried to start the car but would not start. it cranks but will not turn over. I put the old sensor back in (which was missing the paper gasket) but it still will not start with the old sensor either.

I believe the cam controls fuel? I wasn't sure so I didn't want to flood the engine with constant cranking..

 

Paper shim is required to se t the gap for the sensor to work properly.
Aftermarket sensors are suspect in these cars. Recommend replace both Crank and Cam sensors be replaced with OEM only.
"search" over at www.300mclub.org for more info