Why won't my car start?

possible problem is a weak fuel pump. The fuel pump relay will engage for about five seconds each time the key is turned to the start position. If the fuel pump is weak then there is nor enough pressure to fire the injectors until the key is recycled several times. You should connect a fuel pressure tester to the fuel system to see if that is what is happening. Try turning the key on and off several times waiting 3 or 4 seconds between turns and then all the way to start.

Next time you try to start it, turn the key to RUN (not start)for 2-secs. Then turn to OFF. Repeat 3 times. Then try starting. If it fires right up, that's a sign of a leaking check valve in the fuel pump. Turning the key to RUN 3 times triggers the fuel pump to go into "prime" mode to rebuild fuel rail pressure. When fuel pressure is back up to spec, it fires right up.

Use a gage and check proper fuel pressure. Cycling the key on and off several times before you crank it, allows the fuel pump to prime the system.
How long since a tune-up? Are there any applicable trouble codes?

I'm thinking it's the switch itself since it does fire in the 'start' position. The contacts in 'run' position may have become worn, hence no current supply to ignition.. This is not unusual if the ignition key is combined with several others, placing extra weight on the mechanisim. This happens with air cooled Porsche 911's and older liquid cooled VW's..

Have it scanned looking for diagnostic codes. Sounds like you could have a crankshaft or camshaft sensor problem, which will be a simple fix.

The first thing I would check is fuel pressure. This type of fuel injection requires a minimum fuel pressure in order to operate. If fuel pressure is as little as one psi below minimum the vehicle will not start. You can try squirting a couple of shots of carb spray into the air snorkel while somebody cranks the engine over. If the engine starts and then dies you now you fpdeffinetely have a fuel issue. If the engine still won't start check for spark. Let me know what you find. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Thank you for asking me to help you with your problem. However, this is either not within my level of expertise or the question is unclear and I cannot help you at ths time.

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.

This happened to to me with my ranger. I went and bought in ignition and a junk yard and no problems after that. That way your not out of a lot of money.

Answer The "change oil" light on a 2001 Grand Prix is reset by pressing the gas pedal three times while the vehicle is in "accessory" mode:

1. Turn the car off.
2. Place the ignition key in the "on" position, without starting the car. That is, turn the key forward to the place right before it fires the engine.
3. Place your foot on the gas pedal and press it all the way down three times, waiting approximately one second between presses.

If done correctly, the "change oil" light will flash repeatedly, and will then reset.

Please note that it is rare to do this successfully on the first try; if it does not work, turn the car off and try the procedure again, varying the wait slightly between pedal presses at each attempt