One problem related to crankcase (pcv) has been reported for the 2004 Ford Taurus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford Taurus based on all problems reported for the 2004 Taurus.
Vehicle started stalling at expressway speeds, most notably when pulling a hill or during acceleration. This progressed to stalling at idle and low rpm speeds, and eventually led to surging and the inability to keep the vehicle running. This problem led to the vacuum boost for the power brakes failing which caused the power brakes to fail unexpectedly and the vehicle would not stop, hit my garage and caused $3000 damage to my home, and $1000 worth of body damage to the front of the vehicle. Took the vehicle to 2 different Ford dealers. First one stated that it was the fuel pump and pressure regulator, replacing these did nothing but cost $800. Second one discovered that the plastic upper intake manifold was cracked at the egr valve and pcv valve locations leading to the engine running too lean. Stated that this was a common problem on 2000 to 2007 Ford Taurus and that even in the small town we live in he replaced 3 or 4 a month even on brand new vehicles, that Ford was aware of the problem with this part but would not repair or fix. Repairs then totaled an additional $620.