95 240sx runs well but gets bad mileage
5

Asked by spygirl1961 Nov 27, 2015 at 11:35 PM about the 1995 Nissan 240SX 2 Dr STD Coupe

Question type: Maintenance & Repair

95 nissan 240sx s14 used to get 27mpg...currently getting around 10mpg! new 02 sensor...new fuel filter...maf checked and cleaned...air intake replaced. plugs replaced...car runs good. also, only codes was when maf was checked...never a code other than that!  anyone have any ideas?

4 Answers
103,225

KenF answered 8 years ago

Possible catalytic converter is starting to fail. You replaced the O2 sensor, was it throwing a code? That same code pertaining to the sensor could also pertain to a cat going bad. Bad cat = bad gas mileage. Eventually it will lead to rough running engine, frequent stalling. A shop can use a vacuum gauge to determine if there is any clogging in the cat.

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