Sounds like you might have a defective starter or ign. switch. An easy test to determine which one would be to test for bat. voltage at starter switch wire(single wire small connecter) at starter. Disconnect starter wire first and if you have bat. voltage at connecter with ign. sw. off, you have a defective ign. switch. If no voltage is present at starter wire with key "off" the starter solenoid is stuck and starter needs to be replaced. The place where you bought the starter should be able to test the starter and confirm it's defective.
You have the ignition switch wired incorrectly or it's defective.
Have you chk. the starter switch on the steering colume under dash? Or is starter drive kicking in but not engaging teeth in flexplate? If its not engaging teeth on flexplate starter needs to be shimmed, or if its missing the teeth altogether on flexplate or bearly catching the teeth, top of starter nose wear it bolts up needs to be filed down to engage the teeth on flexplate.
SOURCE: 2003 Chevy Impala periodically won't start
Try under the dash, attached to colum is a switch that the rod goes into from your ignition key switch, that may need to be adjusted tword your steering wheel just a touch, they go out of alignmnet from time to time
SOURCE: I replaced the ignition in my 04 chevy Impala and
You have to have the key coded with the ignition switch at a lock smith,or the dealer.
SOURCE: Replaced ignition switch 2003 chevy impala and car will not start
After you replace the ignition switch turn the key to start the car and release leave the key were it stops after trying to start wait 10 minutes until security light goes out turn key to full off position then repeat the above procedure two more times for a total of three on the 3rd attempt to start car wait for light to go out then turn key to full off positoion wait 10 seconds then try to start car body control module should learn new pass code and the car should start.
Big john, J@J Automotive
SOURCE: how to check the ignition switch?
There are some fusible links mounted with the starter on the cable,check to see if they are burned into,pull on them they will pull apart like taffy.Also,check the neutral safety switch ,try in neutral ,see if it will start.Make sure the negative battery cable is good,this can cause the problem also,see if there is 12 volts on the purple wire on the starter solenoid when starting the engine,if not,check the neutral safety switch,if it is good,replace the ignition switch.
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