Question about 1985 Nissan 200SX

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How can i save on gas? its seems to be wasting too much gas.. like in 64 miles half tank. what can i do? air filter, fuel filter, but what else?

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  • aqsecurity Jun 19, 2009

    it has new spark plugs, new cables, mmm its a 85 model so.. i dont think its gonna be good put syntec on that engine. and the car starts just by showing the key, really fast, dont think its gonna need timming. i empty my trunk its factory, i try not to use a/c except long trips.... i dont really know what can i do. its a 4 cilinders with 8 spark plugs.. 2.0 its supposed to do at LEAST 20 mpg :( any ideas?

  • aqsecurity Jun 19, 2009

    nope the car its completely factory its like a 2009 car, runs like new, no exhaust leaks only i took ou the catalytic but over al its ok.. and its wasting a lot. its runs rich, great i love it, the car works better than my 2003 Toyota Echo. thats a lot to say

  • aqsecurity Jun 20, 2009

    what you mean by running rich? if its working good as its runs or that have any other meaning???

  • aqsecurity Jun 21, 2009

    yes its has that some carbon and smells kind of like gas but i dont know how can i find hear range plug? its that may be but how can i resolve that one?



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  • Nissan Master
  • 757 Answers

64 miles is terrible.
Spark plugs, synthetic oil, lighter wheels, timing tune...and anything else you can imagine that would reduce friction, weight, and resistance to airflow.

Posted on Jun 19, 2009

  • 2 more comments 
  • Mike LaPres
    Mike LaPres Jun 19, 2009

    New spark plugs doesn't mean they're ok. Try them with a smaller gap and/or different electrode material.

    Is it running rich? Exhaust leak or restriction? Is it modified for horsepower?

  • Mike LaPres
    Mike LaPres Jun 19, 2009

    Running rich will do it.

  • Mike LaPres
    Mike LaPres Jun 20, 2009

    That means it has a richer fuel to air mixture than optimum. That can give it a little more power but eventually causes the plugs to wear out faster and leave the unburned fuel deposits behind.

    Basically if you pull some of the plugs and see that they have a lot of carbon buildup and/or smell like fuel...that's too much. Try running a 1 higher heat range plug and retest your voltage through the ignition system...weak ignition will cause incomplete fuel burn too.

  • Mike LaPres
    Mike LaPres Jun 21, 2009

    There might be a sticker on the underside of the hood (if you don't have the manual) that describes the plug type and gap you can use.

    You can also go with a platinum type if you aren't already, they run a little hotter than copper and might help.

    A higher flow air filter will help too.



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