gas mileage problem

[Asakite420]

i am only getting about 150 miles out of one tank. i have just done a small tune up (plugs,wires,cap, rotor, pcv valve, air filter) and that didnt help at all. is there any common problems with these cars that would cause such a decrease in mileage?

[deevergote]

Is your check engine light on?

[Tippey764]

To be getting less then 15mpg in an accord really means you must have a fuel leak some where

[deevergote]

Or he's running insanely rich.

[Asakite420]

ive had it for about a month and the engine light came on about two days ago but hasnt come back yet. also the idle is really messed up, if that has anything to do with it. ive already read a couple post on that issue though. nothing is really leaking from the car and i dont smell gas anywhere at anytime but that is one thing i checked for.

[Tippey764]

Or he's running insanely rich.

can the injectors even put out that much fuel under normal driving to make the fuel mileage THAT bad?

i've driven the hell out of my car red lining it left and right and still got 15mpg.

[deevergote]

If the CEL came on and went away, it's probably the o2 sensor.

Read the sticky thread at the top of this section to see how to read and interpret the ECU error codes. I'm quite sure one of them will be Code 43, or maybe 41... both o2 sensor codes. Replace your o2 sensor with a Denso or NTK unit. DO NOT USE BOSCH (and that's what most autoparts stores will give you... so be warned... they don't work!)

In the same sticky thread, you'll find detailed info on how to set your base idle and ignition timing. That will help a good deal as well.

[HATCHing]

Sound like there might be many thing that cause your Accord to have really bad gas mileage. Bad tires? camber problem? tires need balancing?
Does it vibrats when you're on the highway?

just like Deev say you have a 02 sensor problem along with those I mention above.

[deevergote]

Yeah, for mpg that bad, it's probably a number of things... and honestly, fixing it ASAP will be very important. Not only is it expensive to drive a car that gets such poor fuel economy, but it could be damaging the engine, too!


Also, do a compression check, and make sure all cylinders are getting spark. It's entirely possible (with the horrible mileage and bad idle) that you have a problem cylinder.

[VoloCB7]

Something that really fixed my gas problems was replacing my idle air control valve and adjusting my fart idle valve. I was getting about 8mpg before I changed it now even with a bad cat I still get about 250 meals to a tank.

HUGE change!

['93CB7Ex]

yalls gas mileage sucks. lol i get atleast 400 to a tank but i could probably top 500 if i took it easy.

[quaidum]

also check the braking system if your calipers are dragging they will cause quite a drop in mpg, not as significant as yours but it could be one problem of many

[Tippey764]

Something that really fixed my gas problems was replacing my idle air control valve and adjusting my fart idle valve. I was getting about 8mpg before I changed it now even with a bad cat I still get about 250 meals to a tank.

HUGE change!

i don't even

['93CB7Ex]

i Don't Even

Lol

[faqncb7]

ya its probly a 02 sensor mine went out in my civic and gas milage went to shit. When your driving how does it drive any popping or bogging loss of power? possibly it could need a cat