We got a court ordered title for the vehicle that was left on the property we bought at sheriff sale...

If they don't then you will need to take them to small claims court if you want your money back.

(I went to the property the day we had the court hearing for the eviction and saw no trash on the land.

Did you compare their list data to the court records or did the people you contact say they were not in pre foreclosure?  

Check your court records, find out who the attorney representing the owner is, and work a deal with the current owner. 

If the city tries to fine you for something that’s in their control not yours, take them to court, great.

Plus, they're going to be in eviction court anyway (for one client or another) so the cost is usually a little better (since you're not the only one paying for them to go to court).You'll want to have all your paperwork in order before contacting any eviction attorney, which includes the lease and any renewal agreement(s) if applicable of course, but also any written correspondence you've sent the tenant, any deposit receipts (or check photocopies) and bank records, as well as any records of maintenance requests and evidence that you took care of them (e.g., contractor or supply house receipts).I've also been told some judges will want to see proof of ownership so bring a copy of any deed(s) related to the property.

On our last conversation he mentioned "if you are not going to pay me then i know just what to do", I am at a point where i cannot afford going to court if he decides on taking legal action.

You went to court and asked the court to END your partnership, (i.e. let ou out of your contract) and then you continued to be in business with your ex-partner?

A good tip I got is to avoid the neighborhoods titled "courts" or very close by ones.