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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 /
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