Here's the technical description of the p0340-344 diagnostic trouble codes:
P0340 Camshaft Position Sensor Circuit Malfunction
P0341 Camshaft Position Sensor Circuit Performance
P0342 Camshaft Position Sensor Circuit Low Input
P0343 Camshaft Position Sensor Circuit High Input
P0344 Camshaft Position Sensor Circuit Intermittent
Obviously, the camshaft position sensor (CPS) is the probable source of the problem.
See "Related Questions" below for more about the CPS
http://www.aa1car.com/library/ford_lean_codes.htm
It's an O2 sensor code
no no
Easy, get rid of it
If you are getting a Lean code then it is probably being caused by the intake plennum gaskets. This is a common problem on the Windstar. The fix is relatively easy.
Test/replace the cam sensor.
2001 ford winstar sport burning engine oil
Usually, replace the spark plugs and/or the #2 ignition coil.
did you try the fuse?
Test/replace the cam sensor.
P0340-CAMSHAFT POSITION SENSOR CIRCUIT, The cam sensor is the pick up plate in the distributor.
where is the #5 injector? how long does it take to fix