Gingerbreadlady Posted February 26, 2020 Share Posted February 26, 2020 Hi My 55 plate fiesta started playing up and the engine management. So i had someone do a diagnostic test and code PO304 came up. Does anyone have any ideas what it could be. Thank you in advance. Quote Link to comment Share on other sites More sharing options...
dezwez Posted February 26, 2020 Share Posted February 26, 2020 am getting Cylinder 4 Misfire Detected Quote Link to comment Share on other sites More sharing options...
Gingerbreadlady Posted February 26, 2020 Author Share Posted February 26, 2020 We have changed the injector, plugs and coil pack and it's still misfiring and that code keeps coming up Quote Link to comment Share on other sites More sharing options...
Tizer Posted February 26, 2020 Share Posted February 26, 2020 You might have no or little compression in that cylinder. A compression test would need to be done to check for this. 1 Quote Link to comment Share on other sites More sharing options...
Kevin#95 Posted February 26, 2020 Share Posted February 26, 2020 Have you changed the ht lead on cylinder 4. It is the one on the right standing and looking at the front of the engine. If your spark plug gap is 1.3mm you could reduce it to 1.0mm, this will put less stress on the coil pack and it might run better. Does it run ok sometimes? 1 Quote Link to comment Share on other sites More sharing options...
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