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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?

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  • What is the leak in #4 cylinder? If the compression test showed all the same what leak are you referring to? You mention a code 304, is that a P0304 or another type of code? How did you pull the code?
    – DucatiKiller
    Commented Mar 27, 2016 at 18:27
  • The P0304 code and any oil leakage will most likely be two different issues. If you put a new sparkplug in and it didn't change how it's running, the issue isn't with any possible oil leak. How did you determine there is an oil leak?
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Mar 27, 2016 at 18:31
  • oil leaking in #4 cylinder,Sorry all the codes start with P0,so it is P0304,misfire in #4 cyl. Pulled plug ,dripping oil off plug.Turn the key three times then gives code,also Auto Zone
    – Doug
    Commented Mar 29, 2016 at 3:31

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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.

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