Car trouble cranks but no start

There are several things that come to mind. One is the battery. Does it start when you try jumping it. It can also be a bad starter although this will normally have a clicking noise or no noise instead of a cranking noise. It could be the valve timing, spark plug, fuel injection, or ignition timing. If not then it may also be a clog in the fuel line if you let it sit on a downward slope for a few days. Mine was clogged when I was on vacation and mine would crank but would not start. If you go to the link below they have some things to try to test a lot of this. http://econofix.com/nostart.html

i have a 2001 mazda protege 1.6l it was hard to start, meaning it would take forever cranking it over to get it to start so i have repalced the spark plugs, wire,coil packs, camshaft sensor, mass air flow sensor, fuel pump, throtle body position sensor, the egr valve, timing belt os perfect, i evern ran a compression test its perfect and it is still not starting i cant figure it out

My car mazda 323 cranks and wants to start but it backfire on scurvy and goes off

my 323 has just had a new head, head gasket, timing belt and new plugs she gives no spark so i replaced the cam and crank sensors. All fuses are fine and i cant find a immobilizer in it either really running out of options my last resort is a new ecu board yet i fear what if she still doesnt fire up has anyone else faced this issue, I would really love some help thanks

it has head and tail lights no dash/interior lights and will not turn over its like the battery is dead but it is not

I bought Sensor, computer, coil, switch, he never wants stat, he is 2 years old so, I am very tired with it Mazda protege 2001 1.6l JM1BJ222110416267 ( Air BAG) Please help me