i'm getting 13 mpg. not too good. now, mostly i do city driving with some freeway and some highway for work. about 200-250 miles a week or so. when i first got the car i would get about 19-21 for the same type of driving.
background info: 199950 miles on it. my fuel gauge does not work, nor does my DIC. Either the bulb is out or the unit does not work anymore. I have a can tune from ZZP and a 3.4 pulley and u bend delete with a cat and running al104 plugs. these have been on the car for between 1.5 years and 2 years. I put them on about a month or so after getting the car so there is history there.
i know im getting 13 mpg by setting the trip when i get gas to zero, then running the car nearly out of gas either on purpose or accident and then dividing the mileage by the gallons i put in. for the record, its a 16 gallon tank but it will take 18 gallons if run dry. i put 17 in it semi regularly.
i have no check engine light on the dash nor do any codes show up on torque pro scan with the android app.
now, when i go up a hill the car wants to kind of, i don't know how to write it, spudder or something, like its having a hard time. the rpms dance, like 1000-1500 if you try to go at a steady pace (like 45 mph) up a hill. but if you accelerate it accelerates as normal.
i would say the performance is down but the boost still works.
checked vacuum lines, look all good and connected. i replaced them a year or so ago. the plugs n wires i replaced about the same time.
things that make a small difference that i will put out up front: i warm the car up in the morning for 5-10 minutes when its cold (so i can sit in it). sometimes i eat lunch in it and keep it running when its really cold out. and finally, the tire pressure may be a little low. these should not account for the huge drop in gas mileage though.
i have torque pro and can use it to observe whatever parameters it is capable of observing. having it idle in the driveway at operating temperature produced nothing crazy that i saw but i'm not really sure what i should be looking at and i need to take it for a drive and look but i need to know if i can find any clues by looking. i can see intake temperature, coolant temp, vacuum, boost, MAF, rpm, etc. maybe if i just know what normal parameters are i can check for them while driving.
i could run some seafoam in it but i don't think that's going to solve the issue. i'm thinking its gotta be a sensor or egr valve. its not behaving like the cars i've had in the past that needed a new egr valve, though. no gas leaks at the rail or injectors or anything like that.
i need to get this fixed asap and can't afford to just replace several sensors without knowing which one it is right now. i was hoping to make it to tax return and then do a lot of things at once but its not going to happen. anyone else ever have the same kind of symptoms?
Originally Posted by The Sunfire Guy
and why have it? especially since its hitting the stage where crap is going wrong left and right, oil pan is leaking, crank will probably start leaking if it isn't already. which i'll probably be posting a thread in the next few months about it chewing axles up and pulling hard left when braking (i did replace the brake pads, rotors, and front calipers and it still does it) not holding alignment (ive replaced control arms, outer tie rods, sway bar links, hubs, axles (which keep going bad after a few months) motor mounts). eh, whatever, there it is. might as well post now i guess. what's left? subframe bushings? my luck the thing has a bent cradle or something.
