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Q:

car tries to crank but want on 2003 Nissan Altima

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i replaced the spark plugs boots and coil packs. the pcv valve crank and camshaft sensors. it turns over and tries to crank but wont.
(2) Answers
crank sensor is a common failure that results in extended crank time. it is buried behind the motor by the motor mount.
before you do this, it is a good idea to get a real diag to pin point the failure.

Roy
Throwing parts at a car trying to get it to start is an expensive way to fix something. Have your car towed to a reputable shop for a proper diagnosis and have them make the proper repairs.