If you aren't getting calls, it's almost certainly because of the price. My brother was in the used car business (actually the repairables business) and he also tells me that you need to just keep re-running the newspaper ads until it goes. That some cars take 10-12 weeks, then suddenly you'll get 5 calls all at once. According to him, you want to find the local newspaper that offers a "run it until it sells" policy, or find the cheapest local newspaper alternative. He swears that this, patience, and not pricing above the market are the keys. To determine if you're above the market, he recommends looking for other private-party advertised cars of the same make & year and seeing how they're priced.
FWIW,
Jim