HUGE mpg change. HELP!!!

[jeph23]

Hey everyone. I have a 96 TI and I used to get about 400 miles on a tank of gas. I commute to work every day and it has been the same route for the past 4 years. All of a sudden, about 3-4 weeks ago my mpg dropped dramatically. Right now I am getting about 340 miles out of the tank. With the prices of gas now, this isn't the best time for it to be doing this ya know? But, I thought it could be the air filter so I changed it to a RamFX system. Gave me more horse but didn't solve my problem. I then decided to change my plugs. Made the car run a little smoother, but again, didn't fix my problem. I checked the tire pressure on all of my tires and they are dead on, so, I do not know where this is coming from. If anyone has any ideas on what this could be, your help would be GREATLY appreciated!!! Thanks!

Jeph

[KIRASIR]

O2 sensors?

Hey everyone. I have a 96 TI and I used to get about 400 miles on a tank of gas. I commute to work every day and it has been the same route for the past 4 years. All of a sudden, about 3-4 weeks ago my mpg dropped dramatically. Right now I am getting about 340 miles out of the tank. With the prices of gas now, this isn't the best time for it to be doing this ya know? But, I thought it could be the air filter so I changed it to a RamFX system. Gave me more horse but didn't solve my problem. I then decided to change my plugs. Made the car run a little smoother, but again, didn't fix my problem. I checked the tire pressure on all of my tires and they are dead on, so, I do not know where this is coming from. If anyone has any ideas on what this could be, your help would be GREATLY appreciated!!! Thanks!

Jeph

[1996 328ti]

Does your area change to oxygenated gas?

[hotdog19d]

O2 sensors

[yeehawbob]

Definately o2 sensors! change is real easy! Do not waste money on the Tool!

[1996 328ti]

How can anyone be so sure it is 02 sensors? And which 02 sensors? Pre cat and/or post cat?

[NEKO]

I would take your car to an inspection garage and have them plug into your car to see which error codes come up. That way you'll know exactly whats wrong.

[Jeff Spooner]

definatley,definatly O2 sensor, yeah, yeah, definatly. Wapner @ 5:00, Wapner @ 5:00 !!!!
you guys should charge $100 an hour for correctly scanning codes over the internet and give a 12 month - 12,0000 mile warrenty on all parts and labor. Once again your killing me!!!!

[1996 328ti]

Going off topic a bit, I love when people diagnosis a check engine light over the internet. :)

[318.g25]

we'll you didn't forget to take the dead body out of the trunk did you???? thats an extra 160lbs... then try o2 sensors

[bmw///m3///]

at autozone in my town have ODB2 code readers that anyone can use for free. Check into that and save cash.