i have a 99 civic ex with a b16a2 swap and im getting really poor gas milage im getting around 200 to 230 miles from a full tank i have a bad clutch and my idle is around 900 to 1000 i dont know if that could be a reasone and also my o2 sensor is not connected is there any way that i could bypass it cuz the the headers doesnt have a entrance for the 02 sensor i would appreciate help cuz im kind of new on the hondas thanks

 

um jump it to obd1 chip your ecu and delete the o2 not the easiest way but the way i would do it ...... i think you have 2 o2 sensors ....prolly bad gas mileage runnin rich

 

o2 sensor will mess with gas emissions. try bypassing it..... either way... 230 isn't that bad..... i get 240 on average.

 

230 is decent. I've never heard more then 280 on a b16. Change out the gas filter and air filter, may not make a huge difference but it should help.

 

yea that weird i get 320 miles to A full tank of gas with my B16. it can be done it just depends on how you drive it. Since your O2 sensor is not hooked up, that is one reasons why you are only getting 230miles to a tank. go to an exhaust shop get an O2 bung put in and put in you o2 sensor. how bad is your clutch? is it slipping? even if you go OBDI and turn off the O2 sensor you are not going to get better gas mileage without it being tuned. since your car is OBDII you should have two O2 sensors. one before the cat and one after the cat.

 

thanks for the help guys ima try and fix the o2 sensor tomorrow i was told that i could bypass the o2 sensor by buying a little conection at radio shack or something like that does anybody know about that

 

I get 430-ish with my B16A2 (HX shell) - if I feel like pushing it - no pun intended.

Generally, I fill it at around 400, give or take, sooo...

It is possible to get good FE with a B16!