When it tries to turn over does it crank freely? does it cough and backfire? How many miles on this car? before you sit and crank on this you should check the timing belt for anything like belt loose bad pulleys, check connections at starter for corrosion or loose connection,as well as batt connection and cables. did this run fine and the next time you tried to start it failed ? Has it done this a couple times before but started and got worse till now? after you make sure belt and idlers are satisfactory,check starter for operation,then check fuel supply,then check spark plugs for spark. BUT,before you perform any checks, hook a battery charger up to battery and charge while doing inspection and tests.
It is cranking freely. It doesn't cough or backfire. 100,000 miles. Batt and such seems to be connected well. Could it be fuel filter or pump?
okay, then my next search would be, pull # 1 spark plug and rest on engine so electrode is on metal, crank motor. Is plug getting spark,and then is motor getting fuel? do you have manual for this car? does this vehicle have a fuel shut off switch? I assume this car is fuel injected ! well on the fuel rail there should be a valve that looks like a valve stem on a tire,turn ignition on and fuel pump should prime,take a pointed object and stick it in this stem,(watch your eyes) is fuel coming out? if not check for fuel shut off switch,pump relay, fuses. AIR,FUEL,SPARK. USUALLYcar would still start with bad filter, it would just stall after run for a minute due to starvation or on acceleration would not reach higher rpm.
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If 1) the car has gas
2) and you can hear fuel pump( or fuel rail has pressure)
3) and cranks but doesn't start
You most likely have a bad CKP (crank position sensor)
It's under the starter meaning you have to remove the starter
to get to it.
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