toshko321

k so i used to get around 18 mpg city... which is ridiculous to start with. then i got a cai, new spark plugs, wires, and distributor cap and rotor. i got a new fuel filter, i got a new pcv valve, and i dont know what else i have to possibly change to get better gas mileage. i filled up today and now im getting 16.7 mpg, WTF IS THAT. i need to know what can possibly be wrong with it right now, ive changed so much **** that have to do with gas mileage its unbelievable. respond ASAP!

ek-g6

O2 sensors can be bad, i would check that. Cat converter could be clogged, i would check timing just in case it jumped or anything. Make sure gap on spark plugs are correct also.

Pothole987

about the range for the thermostat to be stuck open i'd replace it.

toshko321

where is that located... and how can that change gas mileage??

98civdx

were the plugs gapped correctly?

toshko321

i bought the ngk spark plugs, i put them in as they were from the box, they were gapped correctly i asked my friend.

98civdx

any cels?
is the smokeing? or smelling like gas?

R666_EK

Was the car modified before you got it?

Bad or bigger fuel injectors?

D'sEk9

try cleaning the fuel injectors

Kista20

what engine are you running and any mods you've done for starters would be a big help.