What's wrong with the cassette player on my Camry?

I have an amazing 1994 Camry with only about 70, 000 miles on it. It's an amazing car, and I enjoy every minute I spend it. The only thing that could make my driving experience in it better, would be the ability to connect my iPhone to the stereo and play my music. So I bought a cassette adapter, and it plays my music, but with a horrible grinding sound coming from the tape deck. Any ideas to what it could be? I know it's not the adapter. Any possible suggestions or solutions?

TL;DR '94 Camry tape deck makes horrible noises with cassette adapter, (or any tape) inserted. Suggestions as to what could be wrong? Similar experiences?

Get an fm radio adapter

http://compare.ebay.com/...s&var=sbar

Without a doubt, it's the cassette deck. My only solution is to find to either:

A: Find a Camry stereo deck on eBay if you want to keep that classic look.

or

B: Buy a new deck that will have an axillary input on it if you don't mind not having the classic look.

I do not recommend FM adapters. They're TERRIBLE if you live in the big city, or visit the big city frequently.