WTF is with my damn car, burns through gas..

kovacs32

kovacs32

Nipple show-er
Okay so why is that i know numerous people that have forced induction, built N/A modualr motors and so on and they can still get at least 20mpg if they wanted to, but my car that is a 99 mustang that was a v6 swapped for an 03 Gt motor cant get better than 13mpg wether i drive like a grandma or like a moron it seems that right between 180-and 200 miles my low fuel light comes on and its time to fill up again, i was thinking that after i swapped to my new motor (an almost new 03 Gt motor) from my old setup: a 98 non-PI motor that it would do better with gas becuase maybe i had a bad sensor or somthing...well its still the same.

The only thing that i can think of is that i have an EGR delete (because the tube broke and i didnt want to buy a new one for $50) but i still remember getting somewhat decent mileage like 3 years ago when i did the swap. Anyone have any idea what the hell it could be??

thanks,
Ryan

BTW my only mods are : Shorty headers, off road Pro chamber, Maganaflow catback, BBK CAI, BBK 70mm TB, Ported upper intake penlum, centerforce DF clutch setup, and a diablo tuner which is not adjusting the car what so ever aside from axle ratio and rear 02's off.
 
kovacs32 said:
Okay so why is that i know numerous people that have forced induction, built N/A modualr motors and so on and they can still get at least 20mpg if they wanted to, but my car that is a 99 mustang that was a v6 swapped for an 03 Gt motor cant get better than 13mpg wether i drive like a grandma or like a moron it seems that right between 180-and 200 miles my low fuel light comes on and its time to fill up again, i was thinking that after i swapped to my new motor (an almost new 03 Gt motor) from my old setup: a 98 non-PI motor that it would do better with gas becuase maybe i had a bad sensor or somthing...well its still the same.

The only thing that i can think of is that i have an EGR delete (because the tube broke and i didnt want to buy a new one for $50) but i still remember getting somewhat decent mileage like 3 years ago when i did the swap. Anyone have any idea what the hell it could be??

thanks,
Ryan

BTW my only mods are : Shorty headers, off road Pro chamber, Maganaflow catback, BBK CAI, BBK 70mm TB, Ported upper intake penlum, centerforce DF clutch setup, and a diablo tuner which is not adjusting the car what so ever aside from axle ratio and rear 02's off.
Click to expand...


That EGR will eff up your gas mileage unless you have it professionally tuned out. I Beieve it will make the car run rich as hell
 
turbo89gt said:
That EGR will eff up your gas mileage unless you have it professionally tuned out. I Beieve it will make the car run rich as hell
Click to expand...


I thought so, but it was turned off through my diablo tuner, but for some reason the POS tuner decided to turn it back on and leave it on, so i hooked my DPFE sensor and other EGR elctronics back up and it eliminated my Check engine light for the EGR so i dont think thats the problem... and from what i have read that wouldnt/shouldnt reducde my mileage by as much as 100-130miles for a tank.
 
you need to have that fucntion totally off, not just the cel. i have a blower, with the egr deleted. and i get better mileage then you.
 
Venmous28 said:
you need to have that fucntion totally off, not just the cel. i have a blower, with the egr deleted. and i get better mileage then you.
Click to expand...


I dont understand why my diabloe tuner is so gay. It used to turn it off and be fine but now if i go into it and turn it off, and go right back to the EGR menu its right back on....is there a way i can get my tuner updated or somthing...its irritating the shit out of me. So do you guys really think that its all about my egr? i wouldnt have thought it would kill my mileage this bad..
 
i have no clue about diablo.. or much of tuning alltogether, but i know if you dont have it and its still turned on, its not a good thing. to be so bad as 3-7mpg? i dunno. im sure its affecting it tho.
 
turbo89gt said:
That EGR will eff up your gas mileage unless you have it professionally tuned out. I Beieve it will make the car run rich as hell
Click to expand...


ding ding... significant drop in MPG!!!!!
 
Load the the stock tune back on the car.. drive it thru a complete drive cycle.. then unhook the battery.. setp on the brake pedal .. hook the battery back up about 10 minutes later.. drive a complete drive cycle again.. then reload the performance tune from the diablo\custom tune and shut off the egr again.
 
motorcitymustang said:
how old are front o2 sensors?
Click to expand...


Fairly new, supposidly off a car with les than 100 miles, they even looked new. The old 02's i changed were almost white.

Need4Speed: I will try that tommarow, I appricate the info alot, is that a way to reboot the diablo system or somthing?
 
You must log in or register to reply here.
Back
Top