my car is eating gas i like like 4 or 5 miles to a gallon what could i be.. can it be when i chipped my ecu the messed up the a/f ratio or can it be something else...

btw i have a ls i/h/e cams

 

Did you put a lift and 42" tires on it?

If all you've done to the car is i/h/e/chip and it was working fine before that, then yes your tune is way off. You could have a fuel leak or a vaccum leak as well. That's pretty impressive that you can only get about 50 miles to a tank lol.

 

lol funny i put it all in at once since my old motor starter knocking so i bought a motor and put i/h/e/ cams so idk how it ran before that

 

lol @ 42" wheels tune that thing since you chipped it. do your usual tune up. check your tire pressure, clean your injectors, work out and lose weight.

 

lol @ work n lose what i have like no fat to lose... did all the stuff already

 

should i try to chip it again maybe he messed up the a/f ratio

 

So you motor swapped and also changed the ecu tune...things just got more complicated. Are you sure you connected all the wire connectors and hoses where they need to be?

- Put a stock ECU back in the car and see if your mpg comes back. If it does, then throw out that chip and get a tune.

 

what "chip" do you have?

what cams are you running?

 

if your MPG is really that low, you should be smelling fuel and/or seeing unburned fuel dripping out of the tail pipe.

 

^Thats what I was thinking if u get on it u should really smell some fuel, well actually u should be able to smell it idling with that MPG lol.... Try a stock ecu ASAP before u mess something up...

 

What chip are you running? is it that bad *** new eXXon chip or the mobil 1 chip?

 

Check the o2 sensor also, Make sure it is reading in preamiters and its my biased lean.

Like they said swap to a stock ecu and see if that increases your mpg at all. You tune may have got ****ed up also causing you to overfuel.

Whats your fuel system you are running? FRP Fuel Pump, Injector CC?