I have a 2005 PT Cruiser Convertible that's leaking oil in #4 cylinder causing engine light to come on. Now, I have changed valve cover gasket and tube seals, spark plugs and wires and coil, pcv checked okay, compression test on all cylinder was 120.
Still leaks in #4 and light comes on with code 304. Any suggestions?
From obd-codes.com:
A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.
A code P0304 may mean that one or more of the following has happened:
- Faulty spark plug or wire
- Faulty coil (pack)
- Faulty oxygen sensor(s)
- Faulty fuel injector
- Burned exhaust valve
- Faulty catalytic converter(s)
- Running out of fuel
- Poor compression
- Defective computer
I would recommend checking compression on your 4th cylinder. If it's really bad, it not impossible a bit of oil is seeping in there. It could be time for a piston ring replacement.
