Two problems related to engine knocking noise have been reported for the 1998 Ford Taurus. The most recently reported issues are listed below.
Vehicle purchased new, 2000 miles transmission quit working was rebuilt under warranty by Ford. Transmission is out again car will not move without increasing rpms to 2,500, transmission slips and car is not drivable. Makes loud knocking sound. Estimated $2,500 rebuild needed. Head gaskets went out at 80,000 miles and were replaced for $600, this is a common problem with Taurus.
There was a knocking noise coming from front of vehicle. When dealership examined vehicle, it was determined that main piston in engine was corroded and had to be 'cleaned'. Please provide any additional information/attachments.