Motor will turn over battery and fule appear to be ok but will not start. 2003 Pontiac sunfire.

Pontiac Sunfire Questions - car won't start - CarGurus

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CarGurusAug 16, 2011 - car won't start - replaced ignition lock on 2002 pontiac sunfire antitheft light is ... system goes into fail safe mode and you won't have any more problems. ...lock cylinder on 2003 pontiac sunfire....when new lock cylinder was ...

Is this a GT or SE model and what size engine 2.2 or 2.4?

Voltage drop testing the starter circuit . Bad connection , battery cables etc.....
Starter Voltage Drop

You might want to have it checked to see if you have fuel pressure or see if there is spark going thru to your spark plug.If everything is ok it might be your timing belt needs replacing

there is still more to check. like the mass air flow sensor, the whole fuel line cleanout, and if its an auto it does have a camshaft sensor. its located into the transmission.

Remove or disconnect the following:

• Negative battery cable
  
• Air inlet duct
  
• Top starter bolt
  
• Lower starter bolt
  
• Starter electrical connectors
  
• Starter motor
  

Exploded view of the starter motor—2.4L engine

To install:

1. Install or connect the following:
   
   • Starter motor. Torque the bolts to 66 ft. lbs. (90 Nm) for 2.4L engine or 37 ft. lbs. (50 Nm) for the 2.2L (VIN 4) engine or 30 ft. lbs. (40 Nm) for the 2.2L (VIN F) engine.
     
   • Starter electrical connectors
     
   • Air inlet duct to the throttle body
     
   • Negative battery cable
     

for some reason it thinks you are trynig to steal your own car???? are you using the same key you always use? a dealer or a qualified repair shop will need to check it for you.

Check your chassis ground strap. There should be a braided cable, or a cable similar to your battery cable, that runs from somewhere on the engine to the chassis. The reason you have multiple items lighting up or working when you try to operate one item is because it is trying to get a ground through another source.

Please clarify turning over. Does the engine turn but get no spark or is th eengine not turning at all?

HI.

Follow this step to keep running your sunfire.
1 - Be sure the battery is full charged.
2 - Is better if you put a battery charged
3 - Turn the key to run position and tray to start the car and leave with the key in run position,
With a watch let pass 10 minutes no less. you gonna see the security light flashing and stop flashing after 10 munites.
4 - After 10 munites turn the key to off position during 30 seconds, with watch on your hand, OK.
6-- After the 30 seconds try to star the car

I hope this solve your problem.
Please letme know.

Thank you for use fixya.