Didn't know his car is full of rust holes.

Yes I agree your most likely culprits are bad sensors

Try living with Boost, my friend

so i guess replacing the sensors is the best thing to do.

someone know if a j/y is an option or will they just go bad just as quick?

Why not jsut buy new ones?

i think i am, i found a cheap website so i think im set

is tru tech a good brand?

Golden Bullet:

I can think of a number of items:


Right about now is usually heavy winter in the Twin Cities --I know it well and drive around there now and then.

Are you driving in a lot of snow with aggressive snow tires? That'll knock off a couple of mpg (not much you can do about it, of course).

Traffic has gotten awful where you are. Are you taking 45-60 minutes to get to work or school that should take only 15 minutes? Scratch another 2-3 mpg.

Tires up to correct pressure?

With all the salt they're putting down to rust your car so bad, maybe your rear (and front) brakes need a good look at. They could be binding.

How did your plugs look? Nice and toasty tan, or is one fouled and oily. Could you actually be running on somewhat less than all cylinders?

How bad was your air filter? If you couldn't see the sun through it (ok a bright light bulb in winter), knock off a couple of miles per gallon (or hopefully now gain it back!). (Oops, you replaced that already. I assume it'* not getting dirty real fast)

Finally, how was your mpg on your last steady highway trip? If you're hitting 26-28 mpg, then your car is probably not so bad, just a lot of winter driving bunching up on you.

That'* not to say you don't have a bad sensor or two.

But think about all of the above things (and you'll probably think of more) -- the Twin Cities alone is pretty tough on mpg :( .

Good luck!

By my definition, keeping your foot out of the throttle means no more than 2000-2500 rpm at all times. So I hope you're not thinking relatively, say 3500rpm (mileage will still suffer) vs WOT and 5000

slug, thank you for your advice, also ive been getting this mileage since summer , and i drive about 7 miles a day

repin, lately i have been keeping it below 2500 unless i need to which isnt that often.

i defintely say oxygen sensor. but definitely don't get a bosch, just stick with that cheap one i showed yah. Denso is a good company and as far as i know, make good o2 sensors.

Also, I as far as I know, the new recommended interval for change is 30k for the 1 wire LN3 sensors. Not 50k anymore. Just a tip. And at that price, 30k isn't a big deal!

7 miles a day may be a problem. Your first couple of miles are usually using a lot of fuel. And if it'* 3 1/2 miles in the morning and 3 1/2 miles late afternoon, there'* no way you can expect to get much better mpg than what you stated (I think). It takes a mile or two for your car to warm up and become efficient.

Personally (and I may be at odds with the gurus), I wouldn't put a lot of money and effort into car repairs (other than tuning and general maintenence) until you can get some better test conditions for determining city and highway mpg. You can bet manufacturers are using far less extreme conditions for determining city mpg than you are!

(By the way, did your mpg take a dive since a year ago, or haven't you had the car long enough to know?)

Hang in there