Starter turns over but wont run sometimes (once every 2 months)

okay , it needs service in a real shop.
what does it do now.
is the starter dead?
keep in mind we can not see the car , drive it or hear the
starter motor fail or not.

here this sound?

https://f005.backblazeb2.com/file/notstart-cranks-fast/cranks-but-not-start.mp3

Starters tend to fail intermittently. Yes, if it started after a "whack", I woul suggest replacing your starter. Make sure all connections are tight and of course clean terminals and cables.

I had this problem.. on my carthe nutural safety switch its called a "combination switch" $175 So i put a push button on the dash which is wired from the battery to the starter.. now if it does not turn over i just turn on the key and push the button.. switch was $3. and about $3 worth of wire.. Works Great..

I am having the same problem. did you figure out what was wrong with yours. I have tested all of the wires in the harness under the dash, they r fine. I pulled off the starter and had it tested; O'rilies said it was fine. It is a 5 speed, and I can push start the car just fine any time. Like yours, some days my car starts, some days it doesn't. The days it starts, it runs fine with no problems starting or running. the problem is the days that it wont start.

Ok then, from your description and the
make/model/year of the car you have there,
it appears you've reset the VATS.

The car's security immobilizer
reader at the key switch
does not recognize the coded
chip in the ignition key any longer.

You can try to put the key
in the ignition, turn to the on position &
wait at least 10 min like that.
(Do not turn off the key switch before
10 minutes as elapsed!)

Once done, the key is re-programmed and
should allow the fuel injectors to work again.
The car would start now if corrected.

In some cases, the VATS (GM'S VEHICLE ANTI THEFT SYSTEM)
will re learn the code this way, and will then
allow the restart, however if this does not work,
then you can simply tow it to any GM vehicle dealer
to have the service department re code it.

There is a permanent solution though.
Adding the PLJX Self learning Bypass module (59.95)
will bypass the PASSLOCK system in your vehicle
for good. See this at www.PASSLOCK2.com

Good luck I hope method 1 does the trick!

Here is the 30 min relearn:

Ignition keys relearn takes about 30 min to do. 30-Minute Learn Procedure 1. Turn ON the ignition, with the engine OFF. 2. Attempt to start the engine, then release the key to ON; the vehicle will not start. 3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF. 4. Turn OFF the ignition switch, and wait 5 seconds. 5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK Important: Turn the Ignition Switch OFF. The vehicle learns the Passlock Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle. 6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password. 7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles. Without a scan tool you may have momentary starter interruptions while history clears itself.

Its a Electrical sensor, costs $500 plus labor 300
total 800

The ignition relay is faulty.
Look into that.
Please accept this answer to remove the multiple occurances of this same question from the work queue.
Thanks!!

it sound like its in the coleum . may be your key switch is bad . its something simpull. check your fues inside and out .and see if you can hear your realay working. i hope you can find the prob

next time it wont run check it for spark.if u have no spark try the crankshaft sensor. my lumina used to do the exact same thing. hope this helps