Question about 2001 Hyundai Sonata

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Bad gas mileage

I'm getting 10 miles to the gallon vs. the 21 I had a month ago. I took it to a mechanic and they couldn't figure it out. I have had both O2 sensors changed and MAF. Any suggestion on what might be causing the problem. I ran fuel injector cleaner through my last tank of gas.

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  •  Stephen
    Stephen Feb 07, 2014

    Hi Karli, if its been extremely cold where you are these past few weeks, that can account for some of the difference. The longer it takes the engine to reach 195 degrees the more fuel it burns.

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Have u changed all your plugs and check plug wires. Look at your firing and timeing .

Posted on Feb 22, 2014

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Posted on Jan 02, 2017

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SOURCE: Poor acceleration, poor gas mileage

I have the same problem as talked about above. 2002 Hyundai accent gsi. HORRIBLE gas mileage. I only get about 320 km per full tank. My driving habits are good. i took it to the garage and they put it on the computer and no error codes showed up. Question: Can a MAP sensor be faulty but NOT show up on the computer diagnostic? I had my O2 sensor checked out and my exhaust, and changed the flex pipe. Car runs pretty good just horrible gas mileage and kinda crappy power. Changed fuel and air filter. Cleaned the fuel system entirely ($80 at garage not $4 bottle).

Anyone ever use a resistor in the MAP sensor?

Posted on Nov 19, 2008

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SOURCE: Replaced 0xygen sensor in 2003 Hyundai Accent 3 Times Not Fixed!

It sounds like you have either a lean or rich condition ocurring,could be exuast leak,vac leak,leaking fuel preasure regulator,cat convertor.At this point would go to dealer for diagnosis.

Posted on Jun 17, 2009

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