VERY poor MPG

[nelapse]

I am filling up my tank twice a week!!!!!
Sometimes i smell fuel when i get out of my car but i do not see evidence of leaks anywhere... i have some Denso Iridium plugs? Think maybe thats killing my fuel? Also i bought a new fuel filter in hopes that it may help out a bit but i have no installed it yet. If anyone has any ideas please let me know.

 

[blackGSX2g]

Have you checked your o2 sensor? If that goes out, it will send a low voltage signal to the ECU. When the ECU sees the low voltage from the o2, it things your fuel mixture is lean, and it will add more and more fuel.

 

[leakyfaucet]

i bought a new fuel filter in hopes that it may help out a bit but i have no installed it yet. If anyone has any ideas please let me know.

So let me get this straight. Your car is using too much gas, so you're going to change the fuel filter in the hopes of allowing more gas to get in?

That's good maintenance, you should do it anyways. Most likely it's just your O2 sensor. Change it, they're only supposed to last about 60,000 miles anyways. If you've been running that rich for a long time, you've probably completely coated your spark plugs and whatever is left of your O2 sensor. Get NGK plugs, ditch those iridiums.

 

[GSGoinFast]

let me reference my manual... yep i would guess O2 sensor also.

wait, you think filling up twice a week is a lot?? jeez i fill up 3 times normally

 

[nelapse]

Yeah i was thinking about the 02 sensor but if it was the check engine light would be on am i right? So what is wrong with my denso's ngk's are iridium as well are they not?

 

[GSGoinFast]

Yeah i was thinking about the 02 sensor but if it was the check engine light would be on am i right? So what is wrong with my denso's ngk's are iridium as well are they not?

well, i have 2 retarded questions for you, first, is it possible your driving more then normal? or your driving it harder then normal with more WOT bursts then usual? if you were running rich enough to see a decline in gas mileage, wouldnt you also see a decline in power and studdering? do you have an A/F gauge?

 

[nelapse]

I drive hard, always have and always will... no i dont have an a/f guage and i dont really drive a whole lot...this is only been happening for a month now... im wondering if my densos are to blame since i got them a month ago it might be the key

 

[GSGoinFast]

I drive hard, always have and always will... no i dont have an a/f guage and i dont really drive a whole lot...this is only been happening for a month now... im wondering if my densos are to blame since i got them a month ago it might be the key

how would the spark plugs cause a loss of gas milage?

 

[nelapse]

maybe not seated properly? running too hot? im not sure but something is up... im out of ideas

 

[crankbender]

maybe not seated properly? running too hot? im not sure but something is up... im out of ideas

Iridiums should be ok in your n/a....they are bad in a turbo.

It is most likely a leak in the fuel system somewhere, a failing cylinder, or an o2 sensor. Look on your fuel rail for a cracked and leaking injector.

 

[blackGSX2g]

Well first off, what kind of MPG are you talking about? Can you give us a number? The o2 sensor will flag a CEL ONLY when the ECU registers I think 2 consecutive 'cruises' of speeds 45 and up for the duration of an hour. I wouldn't count on that to see if its the o2. Check the voltage when your driving to see if it jumps up and down really fast.

To rule out a faulty injector, pull the spark plugs and if any one is alot different in color than the other 4, chances are its leaking. If that was the case, I would think you would feel drivability problems.

Also, I don't mean to insult you or anything, but if you run the AC it does suck alot more gas.

 

[GSGoinFast]

Iridiums should be ok in your n/a....they are bad in a turbo.

It is most likely a leak in the fuel system somewhere, a failing cylinder, or an o2 sensor. Look on your fuel rail for a cracked and leaking injector.

iridiums are bad in turbos? i went with my friends bro to a shop when he got his new ngk iridiums for his 95 GS-T, and i asked the guy at the shop if he had the ngk copper ones(for my nitrous set up) and he told me no, that the copper ones are crap and he doesnt sell them, iridium is the best. that was the first time i went there, and i will probably never go there again. but if iridiums are bad, i better tell my friends bro. what should he get then?

 

[nelapse]

NGK has iridium... they junk too? what should i be using?

 

[kpt4321]

BPR-7ES, for all turbo cars with standard mods. Don't bother with any other crap. Who are you going to trust, some stupid shop owner or your DSMTuners wisemen?

 

[nelapse]

im not turbo though

 

[Tallen]

Your plugs are fine! Your N/T.

Whens the last time you got new plugs?
O2 sensor working?
Coil?
Wires?

So much to check. Have fun.

 

[GSGoinFast]

BPR-7ES, for all turbo cars with standard mods. Don't bother with any other crap. Who are you going to trust, some stupid shop owner or your DSMTuners wisemen?

are those copper? oh dont worry, i trust you over him, thats why i said i wouldnt go back there. alot of shops around here do things that make me question how good they are. a different shop installed my friends bros EGT in his downpipe? i thought it was suppose to be in the manifold before the turbo? but anyways i think your plugs are fine. but the iridiums are not good for turbo eh?

 

[blitz43]

So let me get this straight. Your car is using too much gas, so you're going to change the fuel filter in the hopes of allowing more gas to get in?

That's good maintenance, you should do it anyways. Most likely it's just your O2 sensor. Change it, they're only supposed to last about 60,000 miles anyways. If you've been running that rich for a long time, you've probably completely coated your spark plugs and whatever is left of your O2 sensor. Get NGK plugs, ditch those iridiums.

im experencing the same thing i have poor fuel economy and i have to do gas like every 2 days to 3 days

could it be my sensor went bad to???

where can i buy a new o2 sensor from for a 95 gst?

 

[leakyfaucet]

where can i buy a new o2 sensor from for a 95 gst?

dealer or any autozone type store.

 

[leakyfaucet]

a different shop installed my friends bros EGT in his downpipe

Oooooops!

 

[blitz43]

dealer or any autozone type store.

would my egr valve have anything to do with this???

 

[tsigrl2016G]

i got my o2 sensor replaced from the dealer about 5-6 months ago, because of the recall...it was never done....so it was free for me. They still used a universal application though. Anyway, my car has been running (registering) really lean, so my fuel trims have been way high... it keeps adding fuel to make up for the lean condition. I logged and my o2 sen. readings were bouncin all around... then, the other day, my check engine came on for about 3 min. and went out. I logged while the check light was on and it was the code for the o2 sensor, but now the ecu is reading no stored errors,,so... Yours could very well be going bad, just not registering yet. If it was your spark plugs, you'd notice a little-significant loss of power...like tiny fuel cuts at wot. NGK's are best for imports...turbo or not. Manuals are 7ES, .030" gap,,, but auto.'s are 6ES, .032" gap, either way, those gaps are tiny-run colder for turbos. If the tips of your plugs are reeeaaally white, your runnin lean.

 

[mitsuclipsegsx]

u can buy then @ oxygensensors.com or prostreetonline for 80 bucks

 

[Rice Over Wheat]

I think I need to replace mine. What company is recommended for O2 sensors?