The engine cranks but won't start. there is no

try this link.
Car Won Start Copyright AA1CarYOU TRY TO START YOUR CAR BUT IT WON...
or this one.
Problem 5 Engine Cranks But won Start
or this one.
Troubleshooting Car That Won Start dummies

need more info, year,make,model, is the engine light on have you retrieved all engine codes, when turning engine over, is it spinning very freely or just like it always did,
RE POST with all this info. to get a better diagnoses

Problem 5 Engine Cranks But won Start
http://www.linnbenton.edu/auto/perform/no_start.html

Engine cranks but won start

This could go several ways #1 engine mechanical check cranking compression should have 125 psi or greater in all cylinders if low but even squirt oil (1/2 oz.) in 1 cylinder and retest goes higher then rings sealing has been lost. if uneven check timing belt for jumped or misalignment. #2 electrical does it have electrical spark to plugs crank engine with a spark plug connected to spark plug wire laying plug on engine can you see spark? No test ignition coil wires with a logic probe both terminals will be red with key on one will flash red/green when engine cranking does not the primary ignition needs repair Ignition module? or pick-up coil/ crank sensor. #3 fuel system pressure and injection pulse. injection pulse can be tested with logic probe DONOT USE A TEST LIGHT YOU CAN RUIN THE ECU .

The O2 sensor would have no effect on the engine starting.
And if it cranks it turns over, just may not start.
Have you checked for spark at the plugs, and fuel pressure at the injectors ?
Do you have normal compression when the engine is cranked ?

If a starter is able to crank the engine but it won't start you usually have either an electrical or fuel problem. It's also remotely possibly that it's compression.If an engine has proper fuel, spark and compression, it will start when you crank it. So your challange is to find out which part isn't working right. Start with fuel. Spray a little starting fluid into the air intake while someone tries to start the engine. If it starts briefly when you're spraying starting fluid, you probably have a fuel delivery problem. That could be injectors, fuel pump, fuel filter, relay, fuse... who knows what until you check into it.If it doesn't start with starting fluid, check the spark. Pull a plug wire and attach it to a spare sparkplug and set the plug on a solid metal part of the engine. Have a helper crank the engine while you watch the plug. If you have a good spark, it might just be out of timing.In any case, you'll need to start isolating the problem. Find out which part isn't working then you'll know what to replace/repair.

check for signal getting to coil with a l.e.d test light the coil should have 12v pos going into it and the neg side should pulse when the motor is cranked. if no input is there check c.s.p sensor.

ok, turning over and cranking are the same thing, what your saying is it won't fire, so , 2 things make a motor fire, electric and fuel, so starting with the easiest remedy , remove the distributor cap, and inspect the rotor and connection points that are inside the cap, check for any debris built up , sometimes you can clean them good enough to get the car to fire up, if it does , normally you would replace them , ( not that expensive) remove the number one cylinder spark plug, and once out put the spark plug wire back on it, ( your going to need help with this step) with insulated pliers , hold the plug and place the bottom of the plug against a grounding point (any bolt on the motor will do,, but try and keep it away from the carb as its Hopefully going to spark) have someone try and turn the car over as if to start it, look for spark at the end of the plug, if you have spark,, replace the plug and try and start the car , if it won't,, move onto the fuel problem, you need to make sure that the car is getting fuel, remove the fuel line to the carb turn the key for a second, you should see fuel splashing out, if yes ,, you should be able to start the car , if no,, check the fuel filter first , then the fuel pump,

Hi, if an engine cranks but refuses to start, it lacks ignition, fuel or compression. When the engine cranks normally but won't start, you need to check ignition, fuel and compression. Ignition is easy enough to check with a spark tester or by positioning a plug wire near a good ground. No spark? The most likely causes would be a failed ignition module, distributor pickup or crankshaft position (CKP) sensor.

could be a number of things......engines need spark fuell and air to run.....one of three in your case is not working correctly
try disconnecting fuel line from engine side of feul sending unit and turn over ....get a bucket it could get messy....if you see fuel then check spark...to check spark leave fuel disconnected....and pull out one plugs leave wire on plug and touch plug threads to ground (anyground..eg..alternator bracket)use vice grips but not too tight ..then turn it over again and see if plug sparks......if spark and fuel are present ....then ur into crank sensors or cam sensors these determine when spark is present.....

WELL I WOULD TEST CAM SENSOR OR CRANK SENSOR THE CAM SENSOR CONTROLLS SPARK AND FUEL SIGNAL HOPE THIS LEADS YOU SOME WHERE