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Engine & DrivetrainEngines and Drivetrains can be a major problem for a lot of vehicles. If you are having engine or drivetrain problems, you can post your questions/concerns about the issue. Furthermore, if you are in the process of doing an engine rebuild, post your progress with pictures.
My daughter was driving through some of heavy rain we had on Wednesday and the service engine light came on. Pulled two codes: P0305 (cyl 5 misfire) and P0174 (bank 2 lean). I can feel a bit of roughness at idle. Car has 39K miles on it. I am going to look at the cyl 5 ignition wire connections for possible moisture. What else should I look at? Thanks.
Update: plugs were real bad and the wires marginal so I changed them and the upper manifold gasket. After 20 miles got the same codes. Idle is still not smooth. Looking down the cyl 5 spark plug hole I can see that the top of the piston is wet, cyl 6 looks dry. Tomorrow I will swap cyl 5 on the coil with its mate and see if the problem follows the coil position. I will also check better for vacuum leaks.
Update: replaced the lower intake gasket since I had one and cleaned a lot of the deposits out of the intake runners. Moved one injector to bank 1 from 2 and moved cyl 5 injector (misfiring cyl) to cyl 6. And, replaced the PCV. Misfire code is gone but I still have the bank 2 too lean code (P0174). Tomorrow after work I will snoop around with propane to see if I can detect any leaks. If that doesn't work I will swap all injectors from one bank to the other.
A lean bank usually goes for a bad O2 sensor. Why donīt you try to remove it? If it has moisture then dry it , if it looks dirthy try clean it with some product. I donīt know any name of one for get the job done , but you can ask at Autozone.
Good Luck.
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'99 Taurus with P0305 and P0174 codes 
Linear Mode
