Nissan 35l v6 ignition coil misfire p0303 cylinder 3 misfire as far as numbering of the cylinder for this engine on the nissan quest 2007 nissan murano 35 p0303 runs rough . The p0304 code means that the cylinder 4 is misfiring or is randomly misfiring start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4 if the problem persists more tests needs to be done to diagnose problem see possible causes. I have a 1998 nissan pathfinder 6 cylinder 4wd i changed the plugs wires dist cap and rotor but it still not running right when i hook the code scanner up it tells me 6 cylinder misfire. The location of the number one cylinder is important because it is the first cylinder in the engine firing order the firing order is utilized by the powertrain control module pcm to properly sequence the ignition system firing of the spark plugs and opening of the fuel injectors
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