what is my car worth engine has to be replaced

Nothing. KBB puts its value in 'good' condition at $1050. An engine will cost that much or mote, even a used engine. So maybe $100 tops in scrap, or if the transmission is good and you are willing and able to pull it out, you might get a hundred bucks for it but it would have to be local, shipping a trans will cost a fortune.

if the general condition is good, like tires brakes and such, a used engine installed at a garage would be around 2500 that is like making about 5 payments on a new car, so if you think your expedition would last another few years with a new engine, go for it

Fair condition with bad engine if the body is good might be worth $500 or scrap value.