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i hope this reply will help you. white and blue smoke are both signs of burning oil. the color differential has to do with how "efficiently" the oil is being burnt. your problem is probably not just onething. First thing that comes to mind when you say its hard to start is the air filter. most maxima owners don't know that most air filters are bad for your car. you buy an air filter at your local parts store and you get something that will damage your engine. because the way its designed after a while it will fall apart clogging your MAF and hindering performance (even though you can't see the filter "falling apart"). this can make it hard to start because of the auto enrichments bad reading. (the nissan filter is of better design in its regitity and also is sprayed with second your injectors are most likely, if you have smoke, being gummed up by the burning oil. you will replace many injectors if you don't find out the source of your problem. also if you have a bad injector you will get symptoms similar to bad timing. there isn’t enough fuel, you will run hot, get knocking that may sound like misfire, etc. don't know if that helps but i tried. i don't have your car in front of me or id offer a more substantial and solid diagnosis. anyway keep cool, later
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