Hello havent been here in awhile. have a 2003 Cavalier 2.2L. for my daily driver, im religious about oil changes 3k miles, and i reset my trip everytime i fill up my tank. Its usually around 400 a tank, the last 2 tanks it has been almost cut in half at about 215 a tank. Air filter is new, air pressure is good. car doesnt burn any oil. Only things I can think of is o2 sensor, or plugs (have about 60k on em). I didnt want to just start tossing parts at the car though without knowing. Any other ideas, of course I have no CEL. Wish It did
im thinkin 02 sensor.is it by chance running rich?
no clue, doesnt smell any different, no black smoke. Will have to pull plugs and have a look i suppose tomorrow. Need to do something soon though its my DD i use it specifically for gas mileage. If i dont figure it out soon ill just toss it up for sale
fuel filter is always a good place to start
so no other symtoms other than drop in mpg?
correct. 0 symptoms other then bad mpg. Fuel filter was replaced about 5k miles ago, not that a dirty one is going to cut my MPG in half anyway. The car is highly maintained, mobil oil every 3k, tranny fluid change every 20k, air filter about every 10k.. Plugs are about the only thing that could be due, they have about 60k miles on em. I was gonna sea foam and change plugs as my first step
check around ur injectors...i know the 2200s have a problem with them leaking...my old car did it..and i got like 15-22mpg.....
i have a 2.2 ecotec not the 2200
0 smell of gas anywhere as well
oh ok well that changes things....i have 0 clue with the eco.....but be sure if u post again to specify
to specify what? I said 2003 2.2 in first post. 2003= ecotec
well its my bad..until 02 they came with the 2.2ohv as well...i guess i was assuming 03-05 came with the 2.2 eco or 2.2 ohv
If you have access to a scan tool, look at your fuel trim. If not, spray darn cleaner around all of your intake and vac lines
You find out anithing? Mine is doing the same thing is killing me money wise
driving conditions didnt change?
in the tune, driving is based off of throttle percent and rpm. possibly your throttle position sensor is on the fritz? unplugged maybe?
o2 sensor could be the cause, after all, it is what tells the pcm if it is running rich or lean
maybe you just got a bad tank of gas?
i always got 28-31mpg with my 04 cavalier. never had a sudden drop like that.
let us know
When i had a issue with my old J it was a bad cat . Of course this led to being completely gone with it and my S/C motor build lol
