zenon8890

hi HT,

i own a 98 civic lx, i'm getting very bad gas millage in my car, i dont have any codes, i do my maintenance regularly, did change my fuel filter, air filter, spark plugs, cleaned my injectors but still i get like 180miles for the full tank.

my automatic tranny is slipping on the 2nd and 3rd gear so i guessed maybe its the problem, i drive normally and never speed in my car.

plz help

zenon8890

also i did reset my ecu and due to honda specs everything works perfect, my car doesnt smoke a bit.

niceprelude

did you drive until emtpy,i mean empty and won't start at all

jeremyrocksursox

x2 what you said, maybe your gas gauge is off?

sageuvagony

When I first got my car, I used to get that kind of mileage. I'd get 160-180 miles per tank. Changing the o2 sensor bumped up my gas mileage to about an extra 100 miles per tank. A bad o2 sensor won't always give you a code.

Quiero Mota

I recently failed my smog test and had a new o2 sensor installed. It runs a lot better and has saved me a couple of bucks since a week ago.

Targa250R

"Miles per tank" is a nearly useless figure for comparison unless you keep painstaking records from previous fill-ups.

"Miles per gallon" or "kilometers per liter" are universal and far more accurate units for comparing fuel economy, especially across multiple types of vehicles. It eliminates fuel tank size, gauge accuracy, reading uncertainty, and works for any distance driven. It's also simple to calculate:

1. Fill the tank completely until the pump stops
2. Reset the trip odometer
3. Drive
4. Fill the tank completely until the pump stops
5. Note the volume of fuel pumped on the meter
6. Note the distance driven on the trip odometer
7. Divide distance driven by fuel volume consumed

niceprelude

i don't see there is o2 sensor on my 92 civic,anyone know is there o2 sensor on a 92 civic

Targa250R

All fuel-injected Hondas have at least one oxygen sensor.

zenon8890

i checked my o2 sensor and its working just fine. how i checked it?! my connecting it to the dealers computer

zenon8890

hondas in the gulf area didnt have any o2 sensors in any of thier cars untill 2003

Targa250R

You can't have closed-loop electronic fuel injection without an oxygen sensor.

zenon8890

tell it to the guys in Saudi Arabia loooool, back to my bad millage problem plz, is it from the tranny?

niceprelude

i check my cataylic converter for my 92 civic dx there is no o2 sensor,why is that

Targa250R

What sort of MPG are you getting?

Because there is only one oxygen sensor on an OBD-1 Civic, and it's not in the converter.

zenon8890

180miles per full tank, everything working fine and no codes, my o2 sensor is working perfect i checked it with honda, i only have my auto tranny slipping in 2nd and 3rd gear

Targa250R

That's not MPG.

Depending on how bad it is, a slipping transmission could put a dent in fuel economy, but not likely a large one.

zenon8890

i use 90 octane unleaded fuel, just i wanna add this info

niceprelude

100 miles extra for a new 02sensor,i'll give it a try

lv6l

Pump 85-87 octane fuel, do what Targa250R suggested in his first post and get back with us on how many MPG you are actually getting, without this information we cannot seriously help you.

Pothole987

thermostat could be stuck open. i know of an integra was $10 for 50 kms. Shitty eh. changed everything like O2, plugs, rotor , plug wires cap fuel filter oil change with mobil oil etc... changed thermostat BAM EXCELLENT.