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I have a 2002 Altima it will crank but won’t start up. I have replaced everything from relays to sensors, and today my husband took off the serpentine belt and it started right up no problem. Put the belt back on and it would crank but wouldn’t start up. What the heck is going on here? I need help I am puzzled and can’t figure out why it’s doing this! Help please!
go to autozone and loan a code reader and plug it in under the dash then look up the codes. ive had same problem with my 06 altima, have you replaced both cam sensors and crank sensor? could also be fuel pump, ingnition coils, spark plugs, catalytic converter …. to many things to try to figure out yourself.
Sounds like something is dragging enough to allow the engine to crank but not fire. With the belt disconnected have you checked that the pulleys/tensioners that the serpentine belt run on are free to turn by hand? I can see from a diagram that the belt drives an aircon pump, power steering, alternator, water pump, idler pulley and tensioner. Any one of these could be seized/ difficult to turn causing slow crank speeds or failure to crank when the belt is attached. Hope that helps
