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Old 22 Nov 2011, 01:32 am
Jes Jes is offline
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Default 97 honda accord getting VERY low mpg!!?

my car is getting about 10mpg. i filled the 17 gallon tank and only got 160 miles out of it. my check engine light is on for the vss and intake air temperature sensor but nothing else. i'm changing the spark plugs and wires tomorow but i need help pinpointing the problem. also my exhaust smells a little like unburned gas.
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Old 22 Nov 2011, 01:46 am
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O2 sensor.. probably you could try cleaning the MAS sensor
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Old 22 Nov 2011, 02:03 am
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First thing I'd check is your O2 (oxygen) sensor.

If your check engine light ever flashes repeatedly, shut the car off immediately, wait for a few minutes, and try again if you have to. It possibly means something with emissions control is malfunctioning and it's ruining your catalytic converter, which is the second thing I'd check. They get clogged over time, with or without an emissions malfunction.
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Old 22 Nov 2011, 02:16 am
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You didn't mention if your car runs good or not. if it does run good, then maybe you just have a fuel leak somewhere. if your car does not run good, then we need some details about how the engine is running, starting, idling etc.
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Old 22 Nov 2011, 02:31 am
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have your throttle body serviced. it effects a lot on mileage
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Old 22 Nov 2011, 02:46 am
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The IAT sensor is a suspect, but also make sure the thermostat is closing properly. I had a thermostat stick open (only about a millimeter, barely enough to see) one winter in an older Volvo and the fuel economy dropped to about half what it normally was. A good screening test is to feel the upper radiator hose as it warms up - the hose should feel cold until the engine has actually warmed up, then should become hot within a minute as the thermostat opens.
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Old 22 Nov 2011, 03:01 am
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Sounds like the car is dumping more fuel into the combustion chamber than it needs to so unburned fuel is going through exhaust chamber. You should check the 02 sensors, the throttle body and EGR valve. It's important to find out right away. If your two sensors are bad ( particularly the front one), it can cause your catalytic converter to go bad. It doesn't have to be done immediately but as soon as you can before it gets worse.
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