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Repair Topics / Mileage

Mileage Question and Answers

This category contains featured questions as examples. They relate to most vehicles.

Question: 1994 Honda Civic DX 1.5 liter hatchback_mileage: 133,000. I recently replaced the oxygen. Should it be getting better gas mileage?

Answer: Your replacing the oxygen sensor should make your car run more efficiently. The effect on gas mileage may be very slight.



Question: 2004 Nissan Sentra 1.8_mileage: 41,000. I just bought a low mileage Nissan Sentra. The fuel economy is terrible, not what I would expect from a V6. It sometimes hesitates to start. It warms up very fast but the interior gets unusually warm as though the catalytic converter is working overtime. The excess heat comes up through the floor. What is the likely cause and solution to this problem?

Answer: Scan computer for fault codes. You will probably find one indicating that your engine is running too rich which causes the catalytic converter to overheat. Check the fuel pressure regulator and check for faulty fuel injectors.


Question:  2003 Ford Taurus 3.0 V6_mileage: 48,000.  Several months ago our Taurus city gas mileage dropped from about 23 mpg to 16 mpg.  The highway miles are still close to 27 mpg.  I have had it at two dealers who say no codes show.  They replaced the IAC and fuel pump, with same results.  When started even in warm weather the car jumps to over 2,000 rpm and remains for up to one minute.  Seems to idle rough at about 800 rpm bouncing + or - 100 rpms.  At stop lights it wants to idle high sometimes.  Is this some type of vacuum leak?  Thanks.

Answer:    Test the fuel pressure regulator to see if it is leaking raw fuel into the engine.  If that checks out okay, your problem is probably caused by a faulty MAS (mass airflow sensor).

Repair Topics / Mileage

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