My '97 cavalier cranks for 5-7 seconds before starting. If you turn the key on, then off, then back on again before cranking it starts fine. I can hear the fuel pump running when the key is on. Spark plugs, fuel filter, and fuel pressure regulator all replaced within the last year.
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Get a compression tester, remove all the spark plugs, unplug ignition module and injectors. Now screw in tester hose to cylinder #1, attach guage and crank engine for 3 seconds. Record reading on gauge and move to next cylinder. Repeat this on all cylinders. Compression should be around 90-100 psi and should not vary more than 20% between cylinders.
sounds like security shut down which will start run for second then shut down after several time the security will shut down completely.......you can try what is called the relearn proceedure..this is what you dealer will do...might have to put battery charger on car first... then put key in ignition and turn to the run position do not crank leave it in the on position for ten minutes...... then turn key to the off position then back to the run position again for another ten minutes.....for the last time turn key off then back to run for the last ten minute cycle.... after the final ten minutes is up turn key to off position then attempt to start... let me know
maybe you pinched a wire, damaged a sensor, check the maf, idle air control, disconnect the battery for a while maybe it will reset the computer. doing this erases engine light codes, or check the codes first before, you should led you to the problem.