Why won't my car start?

Question

battery is fine, starter is cranking, car tries to start but won't. Feels like the gas is almost staarting it but doesn't. Worked fine 2 days ago. Thanks 2005 sentra

Answer 1

Spark plugs.

Answer 2

Your spark plugs are screwed up.  

Answer 3

I would guess that an 05 Sentra would have less than 100,000 miles on it. In which case it is most likely either a bad fuel pump (unlikely but possible) or more likely a problem with the engine control system. I recommend you have the car towed to your local Nisson dealer for diagnosis - if the problem is anything in the engine control system it should be covered by the emission control warranty which by law covers all emission control components for 10 years or 100,000 miles. If it is not in the emission system they will be the best equipped to locate and repair a problem in a car that new.  

Answer 4

you need to check fuel pump

take off the gas cap and turn the key to the run pos.

and listen you should hear the fuel pump kick on for about 5 to 10 sec.

if the fuel pump kicks on you should test for pressure

you can test this on the fuel rail on the engine where the injectors are

pressure should be about 30-45 psi.

if not the fuel pressure regulator may be bad

this is only one of the things that could be wrong.

a car will not start unless it has  1. good spark  2.good air flow 3. good fuel pres.

Answer 5

Yep Plugs or cap and rotor if you have them if not Points.

Or Pull your oil dipstick if it looks Creamy then you blew your head gasket and the compression it not there  the other thing is Valves you could have one or more stick open from Gunk building up in the motor