I have a 97 4runner sr5 v6 automatic, yesterday when I turned the key in the ignition it made a horrible grinding sound but started and ran fine. Now every time I start the car it does the same thing. Any ideas what this could be before I take it to the dealer?

 

Consider a starter. The gear from the starter that goes onto the flywheel may not be working correctly. That is my best guess? Starter at the stealer is ~$500. If you get it from NAPA or something it will probably be in the ~$250 range + labor to put it in if you don't want to do it yourself. It is pretty tough from what I have read.

 

Did you have the car on when it made the grinding noise?

Check to make sure the starter is bolted on tight.

 

x2... check that the starter bolts have not backed off. Do this sooner rather than later. If it's loose, it doesn't take long to cause damage. If it's bolted in tight, I'd remove the starter to inspect it and bench test it to make sure it's working properly.