hyundaipower

i need help. the last few tanks in my tib have barely reached 175. i have stopped speeding, kept the rpm's under 3500 almost the whole tank, added fuel system cleaner, and did a e-clean to it, and it is just getting worse. what in the world is wrong with it? :?:

tibwrcsbj

Change your air filter and reset your ECU???

hamhead

Seems silly, but check your tire pressure. I didn't fill up my front tires after I went to the track from 20PSI, and I got about 110 miles on half a tank, where I usually get 150 on half a tank. Make sure your tires are wearing evenly too, might have bad allignment or something as well.

hyundaipower

air filter is new. so ill reset the ec and see if that helps. and my tires are bare, and the allignment is offa tiny bit. so if i change the tires, and reset the ecu hopefully that wil work. o yeah, one more thing, how do i reset the ecu. not with an ODBII, right? and thanks for the help

tibwrcsbj

Just get your car up to normal running temp, turn it off, Unhook your negative battery cable, leave it off for a few minutes and press your brake pedal a few times, then hook it back up and drive aggressively for about a half an hour.

CyberShark

You may want to change your oil if it's old. My gas milage goes up when there's new oil in the pan.

hyundaipower

oils new, but i will try the ECU reset. thanks for all the help. hopefully that works because gettin 175 miles to a tank is not the best thing in the world. laugh.gif

skierd

o2 sensor or fuel filter.

how many miles on your car?

hyundaipower

i hsve 74000 on it. i did a full tuneup maybe 3 or 4000 ago, and now im ettin worse milage

silvertibbs

Yeah, normally that happens, your car kinda gets used to running at a certain level. Then when you return it to stock or better, it doesn't like it. I'd have to agree with skierd here and say that an 02 sensor is to blame. You could be running hella rich and it should throw a CEL.