F120man

ive been getting booty *** mpg on my cx, im averaging 130-140 on a full tank. wtf! so im asking you guys wassup with my ****, im planning to do a tune up for my car to hopefully get better gas mileage. anyone got ideas on what to do while im in tuning phase? so far i got this:
-replace spark plugs/wires
-replace fuel filter and upgrade to GSR fuel pump, and injector cleaner
-valve adjustment w/ new head gasket
-new o2 censors
-upgrade from p72 gsr ecu to a chipped p28??

MilanoRex

how many gallons do you fill it up with? The CX tanks are alot smaller then the GSR tanks.

navin

iTrader: (1)

VX fuel tank w/ GSR motor and bad 02 sensor I get around 220 miles...is this right?

B_CRUZ!

going with a chipped p28 will make your gas mileage situation worse. do a tune up first. BTW whats the mileage of the motor?

1 slo ex

Also change your oil, I have noticed my cars gas mileage starts to suffer when my oil is low/old so replace your oil,get a good ole' oil change.

shawnhayes

I get 25-30 mpg on my supercharged B18C1. You might want to do the things you talked about, but what about doing some troubleshooting first?

Shawn

Cynical 1

Dude, you must have a leak somewhere.

My 93 CX with a B18C1 gets about 250 miles per tank on the highway.

And the CX tank is small, about 9 gallons total.


Time to check for a leak in the lines somewhere...

Black_eh2

same goes for me

F120man

man, theres about 70k on the motor, and just got an oils check, i will be doing the things i listed this weekend, anyone else contribute to the list?

ill phil

Yeah, my guess would be a leak somewhere. Possibly leaking injector or line, because that is plain crappy gas mileage for a full tank.

Kalokohan

I used to get about 205 miles on full tank in my cx b18c1, that was when I ran a skunk2 chipped p28. Now I get about 260 city miles using an obdI p72 ecu and about 300 highway miles. Definitely do some troubleshooting.

gsrvx

how big is a vx fuel tank? same as a cx?

Paranoid Android

a guy down at the local starbucks with a turbo gsr had a problem with this...and every time he start his car, if the hood was up, you could hear a hissing...we looked at it and figured it was his fuel pump....either his was not on right, loosened, or just damaged....so check around the fuel pump just to rule it out quick, cause it will be a bitch to have to deal with later.

F120man

thanks alot folks, will do every thing possible.

00MRSi

Do as mentioned. Also, you said valve adjustment. I think you mean replace the VALVE cover gasket, not headgasket.
Also, how are your driving habits? If your constantly mashing the pedal/VTEC you're gonna use a lot more gas. Just asking because sometimes we don't think about that ****..

ill phil

Yeah if you're constantly gunning it and are in VTEC that may eat some gas too

myhatchrips

compression check foo.

CrOmEdOmEcHaMbEr

im having low mpg also.....i only have 25,xxx miles and everything stock but a short ram (d16y7)..........im gettting about 200 miles per tank IF LUCKY

Trey

I like how no one even asked if you have a Check Engine Light on? If so, what are the codes? I'm guessing the second O2 isn't hooked up correctly (if OBDII swap).

Good luck......

navin

iTrader: (1)

Trey..

I have an OBD-II motor in an OBD-I one car. Will I still need to worry about the 2nd O2 sensor, the only 02 i see is the one where the cat is..

thanks

976

Uh, how often are you running in vtec. Have you ever noticed, lets saw auto-x, mostly in high rpm's a lot, you can actually watch when your in vtec, you gas gauge goes down.

F120man

im not hitting vtec very often, just only when i race, but ill post any more persisting problems after my tune up. thanks folks

GetawayInMoscow

uh Im guessing thats because you are throwing the car into turns and the fuel is moving around your gas tank

Plan B

You only need one o2 sensor in an obd1 car, regardless of what motor you shove in there.

spoon-ej1

Does your car smell like fuel or smoke while you're driving / pushing your car?
If so, it could be a valve stem seal problem. Check your plugs too (once a week for 3 weeks) to make sure they aren't charred and fouled up by fuel.

I hit vtec often on my car (EJ1 with b18c1) and I get about 250miles per tank.