slow and terrible gas milage!! what to do?

[squidmaster]

So recently (ever since I got back from Japan at least) my EK hatch has been SLOOOOW and getting about 14-16mpg when it used to get about 30-32mpg. It drones out in the lower RPMs (anything below 2200) and it feels like it is pressing on the breaks because the car almost comes to a stop. It keeps droning out.

Mods:
I/H/E and coilovers and yes my ECU was reset after intake and exhaust and header. I never got the bad gas mileage when I put all the mods on, just now for some reason.


Car has 103k original miles on it, if that makes any difference.

Things I did to try and fix it:
new spark plugs
adjust the ebrake (thought it might be that since my ebrake light is ALWAYS on. so I basically removed all tension on the lines)

 

[Kaotic_Zeus]

Sounds like a fuel delivery problem, or a electical problem like a ground cable loose or broken.

 

[EK|B]

Maybe you need a new O2 sensor? When they go bad, your gas mileage goes belly up.

 

[Kaotic_Zeus]

that too...

 

[Szady]

Are the brakes actually binding up?

 

[squidmaster]

Sounds like a fuel delivery problem, or a electical problem like a ground cable loose or broken.

Maybe you need a new O2 sensor? When they go bad, your gas mileage goes belly up.

Both great ideas! I don't have off work again until Friday or Sunday so I'll have to check it then.

Are the brakes actually binding up?

When I put it in neutral it cruises just fine
no resistance, so I don't believe it's that.

 

[squidmaster]

OK so I checked all of the O2 sensors, they are fine, connected and properly installed.
Ground cables are fine.
I am thinking, I was T-Boned in my rear drivers side panel, you know, right where the gas tank is, so maybe it was damaged and gas is evaporating or something...... hmm... I need to get it fixed still. I guess I'll just keep driving the FG2 with no A/C arg.

 

[cadieux_j]

if your ebrake light is on check your brake fluid

 

[squidmaster]

would that really cause my main problem though?

 

[squidmaster]

still have the problem.
hitting up a junkyard to get a non veetack OB1 ECU and conversion from All Version and then get it tuned (again by All Version)

 

[Shiznit]

how long were you in japan? and if it was for a while did you store your car correctly?

 

[squidmaster]

how long were you in japan? and if it was for a while did you store your car correctly?

correctly? as in the only way I can store it, outside.

I was in japan for 2.5 months about

 

[chinkyeyedemcee]

your timing is off

 

[squidmaster]

damn I guess I need a new timing belt.

 

[slvercvc]

did you leave it with fuel in your tank? if you dont move the car for a while, the sediment in the gas will settle and mess up your fuel injection and pull the plug on your power.

 

[Dannyloski]

^ Very true. I'm thinking that's the cause of it.

 

[PhntmSk8r]

so it wont rev past 2200?

My friends car was doing the same, and she was getting shitty gas mileage (94 coupe, jdm b16 swap), couldnt figure it out... turned out to be a plugged cat.

Just throwing out an idea.

 

[Jas0nEK]

so it wont rev past 2200?

My friends car was doing the same, and she was getting shitty gas mileage (94 coupe, jdm b16 swap), couldnt figure it out... turned out to be a plugged cat.

Just throwing out an idea.

That's a good idea too. I was thinking that the phenomenon of sediment settling in the tank to cause problems took a little longer than 2.5 months to really be an issue. But of course I could easily be wrong.

 

[98civikdx]

Oldish thread, I know. Another thing to check is your air temperature sensor. If it's not right it can affect mileage and performance. Just something I learned in class tonight. Good Luck figurin it out.