Have got the above vehicle in the workshop at the mo. Came in with mil light on and misfire, fault coded came up with P0303 cylinder 3 misfire and P0300 multiple cylinder misfire. Renewed spark plugs and coil pack using original delphi coil, road tested seemed fine until coming back to workshop. Mil light started flashing engine started misfiring and light came on constant. Fault coded again and same fault codes, checked primary ignition all 4 signals were good. Not sure but does the E.C.U switch off the fuel injector when a misfire is detected? The oxygen content in the exhaust gas was very high not sure what reading didn't write it down. Switched the engine off and back on and the misfire had gone and it ran perfect! Had same problem with another astra just a few months ago same year and engine. Tried 2 different coil packs on and still the same,didnt get to the bottom of it customer traded vehicle in. Has anybody had similar faults or could suggest anything would be much appreciated.
Many thanks Jamie.
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