Starter noise 2000 hyundai elantra: when started, the starter makes a 'tinny" whirring sound for a few seconds while it slows down after engine starts and starter is deenergized. Bendix drive? Cure? Bob McSweeney

Ignition switch has issues or related starting components like startrmotor...cud b burnt windings. May want to hit it w hammer few times to work so u can git to a shop or parts

You may need to check the belts on your car's power steering section. Make sure the belts are tight and not worn out. Check for cracks on the belt and if loose, tighten it. There is also a product called Automotive belt dressing that you can spray on the belt to make it stick more easily to the pulley it is supposed to turn.

sounds like speedometer cable is gone or the gears between the cable and transmission which makes the reduction for sppedometer if no cable on that year they have a sensor

could be the starter relay .

Replace the fuel filter and have the injectors cleaned.

Check engine block ground.
Check starter.

There is NO kill switch on the 2000 Elantra... HOWEVER, there is a thing called the Key Fob (keyless remote entry system). There is, however, a system in place called the 'starter kill' circuit and it is activated when the burglar alarm goes off.... it's called the burglar alarm relay and it is activated to prevent the engine starter system from being used. There are three ways to get the engine started in such a circumstance... 1. use the key fob to 'disarm' the system... 2. put the key in the ignition and turn it to the 'RUN" position and wait until the alarm stops (horn stops beeping and the parking lights stop flashing), then the engine will start.... 3. pull the starter relay from the UnderHood junction box and bypass the starter circuit (key in ignition and in the 'RUN' position), jumper the starter solenoid circuit to energize the solenoid to start cranking the engine -- it should start then.

The whirring sound is more than likely your fuel pump. Give it a few seconds to build up pressure before cranking or have the pump replaced.

This almost sounds like the fuel pump check valve is leaking back during the day. Try this to see if it helps. Before you start your car during the day, cycle the key on and off a few times first. This runs the pump for a few seconds and builds up fuel pressure. If it starts immediately after the key cycling, that is most likely your problem.

remove the starter motor and check for damage/wear on the teeth of the starter motor and the ring gear teeth on the flywheel.turn the engine by hand while checking the ring gear so as to check the condition all the way around.hope this helps