[aji328]

Hey guys,
The check engine light came up, check the code and it was a P0304 cylinder #4 misfiring.

Did a search and read up on it. First step was to swap out coil and spark plug with another cylinder to see if it tracks.

Swapped cylinder #4 -> cylinder #1.

Ran the check and cylinder #4 and cylinder #1 reported. Glad it moved but surprised #4 was still showing.

Then moved cylinder #1 (original #4) -> cylinder #2.
Ran the check and now, cylinder #1, #4 and #6 shows up.

Cylinder #6 definitely was not touched, not it's being flagged?

Am I doing something wrong? What should be my next step, go ahead order 6 new spark plugs and 2-3 coils?

thanks in adv guys!

[PichaDis11]

Make sure you clear the codes after each swap. and why swap both plug and coil at the same time? You Need to swap just one; i.e. swap coil to check coil first (easiest). Then proceed to plug.

How many miles on the car?

[aji328]

Thanks for the reply - I have a dashcommander app; I've cleared the codes with each swap and they all show up in the Pending category after each read.

One thing though, there is a category of stored codes which I cannot cleared and cylinder #4 is always there.

52k miles on the car