My saturn will turn over but won't start all of the sudden. I went to pick up my son at youth group and have had no problems but when we got in the car to head home I tried to start the car and it would turn over but would not start. it sounds as if I am out of fuel however I have a quarter tank

had u turn on similar problems with Honda crx replaced fuel pump relay turn on ignition but don't start car listen

on a lot of these late model computer base cars when battery power get low the computer gets confused. try this disconnect the neg. battery cable. charge the battery. reconnect and try again. my son cobalt battery went bad key was stuck in the igntion. good luck.

Hi Jennifer, I believe that it purely coincidence that this problem started when your dad drove the car. There is basically nothing he could have done to promote the problem. I believe the fault has something to do with the anti theft device becoming active. If you can manage to have the car diagnostically scanned and the key encodement re activated I'm thinking that will sort out the problem. Even if that is not the problem the diagnostic scan will pin point where the problem is. Regards John

what about a broken timing belt
cam shaft /crank shaft position sensor or failed immobilizer

how old is the battery?

A very similar experience happened yesterday with my son's '95 Cherokee Country, same 4.0L engine. Suddenly jerking, trying to die, then catching again. When he stopped and turned the car off, just like yours, wouldn't start and no spark...and in his case, bad fuel pump, too.
After changing that, we started looking for the no spark problem. First checked the dark green wire (+, or the power feed) to the coil, and nothing there with key on. No voltage. Strange, so I went back and rechecked all the fuses in the little box by the battery. All good (a very easy way to check a fuse is with a testlight: Just clip the lead on the negative battery post and, with key on, use the probe to touch the little slot on each end of the fuse. When ignition key is on, all fuses are powered, and if the testlight lights up on both ends of the fuse, you know it's a good fuse. You don't have to pull it out to check it- it's good.) So fuses were good, and I even swapped relays for the Auto Shutdown Relay, wondering if that could cause no signal to the coil. Still nothing. Because it is so easy to check on a Jeep, I checked another thing that may cause a no start, no spark condition: the Crank Position Sensor. On the rear top of the engine, right above the end of the intake manifold, is the three wire electrical connector for the CPS. To check the sensor, pull the connector apart, and on the sensor side of the connector, check for continuity (with an ohmmeter) between terminals B and C (marked on the connector-although mine weren't). There should be no continuity. That's the only test given for the Jeep's Crank Position Sensor.
Well, in my case it turned out to be a badly mangled pick-up coil assembly inside the distributor. That helps the computer determine crankshaft position and adjust spark timing. You need to start as I did with checking for power to the coil. If you have power there on the green wire with the key on, then start by checking the coil-it can be tested, then check the ignition control module-test it at a parts store, next check the two sensors -CPS and the pick-up coil (on earlier models was referred to as the cam position sensor). The distributor is a pain to remove and install, if you have to.. You may need to consult a repair manual for proper installation. I hope you find your problem. One last tidbit: this is my son's second Jeep he bought with the motor mount on the passenger side (right by the distributor) missing all the bolts for the mount's bracket onto the engine block. It made the engine sag to that side, and may have bumped the distributor housing hard enough to destroy his pickup coil. So do check your engine mount on that side.od luck.

Done cars have a kill switch if they are low on oil. Check your oil. If the oil is good, it may be the ignition switch.

It sure could be. But, first...by "won't turn over" you do mean it cranks at normal speed but won't start?
A simple test of the fuel pump is to stand by tank and listen as someone turns key to on. When first turned to on, your pump will activate for 2 or 3 seconds, pressurizing the fuel system, and then shut off if the engine computer doesn't get a cranking signal. Do you hear it come on? If not, then something's not turning your pump on. If you can hear it buzz on briefly, then maybe it's your filter. Another test: Spray a little starting fluid into your intake manifold (remove the big hose going into intake manifold) while someone tries starting it.If it doesn't fire and try to stay running, then it's probably an ignition problem. But if it does fire off, then you know it's a fuel problem-likely your pump or filter. good luck.

Check fuel pressure at the injector rail. If good, suspect crankshaft position sensor--when it fails to start, check for sparks by pulling an ignition wire off the coils and holding it close to the coil with an insulated tool while someone cranks the engine. If no sparks, replace the sensor.

put a drop tester across the battery its flat for whatever reason or had its life so try charging it with a trickle chearger for a couple of days and if still no start then renew it