Question about 2006 Scion tC

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Idle low then hi, and gas smell, and bad gas mileage

I have 1994 mercedes c 280.
the idle is low and then hi and gas smell is coming form the car, exhaust- it smell strong. and am getting horrible gas mileage.

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  • daloone Aug 28, 2008

    you r right, the check engine light has been on for five months, but the car just started acting upo yesterday. I was told me be i put bad gas in it. or water was in my gas. so how can tel if its water or O2 senser

  • daloone Aug 28, 2008

    thank you, i will hook it up to the analyzer machine

    thanks again


  • daloone Aug 28, 2008

    the car now smokes, black smoke is coming out of the exhaust. bad gas smell and slugish. idling is rough, low and then hi

  • Anonymous Mar 12, 2014

    When I'm driving my mercedes a strong smell of fumes like an exhaust smell in the cab of the car ... Very strong

  • Anonymous Mar 13, 2014

    car has a strong smell from the exhaust pipes inside the car. also i changed the spark plugs and now the car seems to not have as much power when pushing the gas.

  • Anonymous Mar 14, 2014

    Miss fires and gets really bad gas mileage exhaust smells like bad gas

  • Anonymous Mar 17, 2014

    Loud muffler or exhaust. No engine lights on. Had heat almost on high and smelled strong smoke smell so I turned heat down and the smoke smell got a lot better. Any suggestions?

  • Anonymous Mar 29, 2014

    exhaust smells like gas, no mileage in town at all, goes thru alot of gas while driving in town



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This should show up easily on the ECU diagnostics computer at a mercedes dealership. Basically your fuel mixture is way too rich causing your car to be heavy on gas, have a raw gasoline smell, and not run right. Something like this can be caused by a defective oxygen sensor (but that usually produces a check engine light) or it might even be a defective ECU. There is really not way of knowing for sure until you do a proper diagnostics where they hook up your exhaust at the same time and do an emmission test. In most cases it's some sensor that needs replacing.

Posted on Aug 28, 2008

  • zeniu17 Aug 28, 2008

    You need to do a proper computer diagnostic. If you're up to it, you can buy or borrow an ECU analyzer, not sure if your car uses OBD/OBD2 or CAN but most of these generic analyzers can communicate in both protocols - but make sure you find out which protocol your vehicle uses. Hook up the analyzer and get the error codes - that will at least give you a rough idea which system in the car needs attention, but in most cases won't tell you the cause of the problem. Having the error code is the best place to start. Just so you know "water in the gas" or "bad gas" are two of the most common and lame explanations given by people who know absolutely nothing about cars or they just want to take the money for diagnostics without having to do any work on your car.



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