My PT cruizer has been"missfiring" occaisionally at idle for quite
> some time - not turning on the CEL. At light load on the road it also
> seemed to hiccup occaisionally.
>
> Today I decided to get to the root of it - need to take the car out of
> town for the holliday weekend.
> Last night the CEL came on so I knew it would have finally set a code
> that I could start with. Put the scanner on today and it said PO301 -
> engine missfire #1 cyl.
> I swapped plug wires from 1 to 4 to see if the miss followed the wire.
> (I had checked wire resistance a couple weeks back, and everything
> checked within spec).
> The miss did not change.
> I pulled the plugs from 1 and 4 (2 and 3 require removal of the intake
> manifold) and the 4 month/ old Champion iridiums looked perfect on the
> firing end - insulators clean and white - gap at .045.
> I decided to swap plugs and see if the misfire followed the plug.
> The misfire dissapeared completely.
> =A0The one plug didn't like firing reverse polarity??????
>
> We'll see how long it lasts.
> What plugs have you guys been using on 2.4 liter PT cruizers????
the dealer uses champion plugs