keefa Posted March 12, 2010 Share Posted March 12, 2010 2003 V6, never missed a beat but now got a prob. Basically it started with a misfire and engine light intermittently comming on. Got a diagnostic check done, code was PO304 but discription was a misfire on cylinder three ? ! Changed plug and coil pack but still running lumpy. Engine light on perminantly until medium / hard accelaration then it flashes. No coolant loss / no signs of head gasket gone. Dipstick spotless. No back pressure. Engine runs at correct temp. Heater / thermostat etc all working correctly. Cleared the fault and it comes back fairly quickly. Used the diagnostics under the misfire count, it's counting on cylinder number 4 so I guess the diagnostic has got a description error in the software. However, I'm not sure how the cylinders are numbered... If its not the plugs / coil, what else could it be ? Appreciate any help. Thanks everyone. Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted March 12, 2010 Share Posted March 12, 2010 P0304 is a misfire on cylinder 4 .......... not 3 (that is code P0303). Bank 1 is at the rear of the engine, bank 2 is the front of the engine bay. Quote Link to comment Share on other sites More sharing options...
keefa Posted March 12, 2010 Author Share Posted March 12, 2010 Thanks for the reply. Yes the fault code is Cylinder number 4 but the ECU reads the firing order as 6,5,4,3,2,1. So cylinder 4 is the 'third' to be read, hence fault code being number 4 cylinder but the description saying number three ( i.e cylinder 4, the thrid cylinder in the sequence) Still got a damn misfire though ! grrrrrr Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted March 12, 2010 Share Posted March 12, 2010 Thanks for the reply. Yes the fault code is Cylinder number 4 but the ECU reads the firing order as 6,5,4,3,2,1. So cylinder 4 is the 'third' to be read, hence fault code being number 4 cylinder but the description saying number three ( i.e cylinder 4, the thrid cylinder in the sequence) Still got a damn misfire though ! grrrrrr The firing order on that engine is 1,6,5,4,3,2.......................... Quote Link to comment Share on other sites More sharing options...
keefa Posted March 13, 2010 Author Share Posted March 13, 2010 Yep but the ECU doesnt log faults the same as the firing order Quote Link to comment Share on other sites More sharing options...
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