I have an 01 elantra. It is getting about 19 mpg highway. Sometimes when i hit the gas it revs to about 4000 rpms but doesn;t really move very fast. also when i am in the 60-70 mile per hour range it has no accleration. there is no check engine light and i just past inspection where the mechanics said they could not find the problem while driving it. It almost feels like an old car with the ac on...it loses power, but mine happens with the ac on or off. I have read about 02 sensor, fuel filter and maf sensor...all of which are supposed to throw a code...any ideas?
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).
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Re: Poor acceleration, poor gas mileage
O2 sensor is the most likely problem - the one before the catalytic converter, not the one behind it. Also, get electrical contact cleaner and clean all the sensor harness connectors you can find underhood. Finally, run a Seafoam treatment (Seafoam is available at parts stores) through the car, and see if that takes care of it.
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sounds like some watered down gas to me... change the filter, add some dry-gas... then turn in the station owner that sold it to ya... if he's from the middle east you can call homeland security too!!!
My thoughts on your problem. First when you rev it up in park it shouldn't go over 3000 rpm the computer wont let it. Did you have the check engine light read to see what the code is? when you say the gas mileage is poor are you comparing it to what it once was? As far as the miss goes is it a constant miss or a random miss? if you could answer these questions I should be able to help you further
Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.
Are you using the correct grade of fuel. Manufacturers claim that a car will do 28 to the gallon. This is done under ideal conditions at a constant speed on a rolling road. Wind, hills, overtaking and tire pressures will decrease fuel mileage. Your car is ok. Don`t expect much more unless you want to drive at 56mph good luck
I don't know from where you bought the car but do you feel certain that typical causes such as fouled plugs or clogged air filters are not at fault?
Most dealers, even the shlocks don't normally skimp on the simple stuff but who knows about a private source?
That does seem low, especially the city numbers. I don't think Hyundai is any leader in gas mileage but they are better than what you are getting.
Your problem could be caused by numerous things, how well was this car maintained? A good tune-up should rectify your problems, oil change, air filter change, tranny fluid and filter change, plugs and wire's, coolant flush, timing belt, thermostat, fuel filter are all things that you should have done if they haven't been done recently. Let me know what you have or haven't done on the car and I can try to diagnose further.