exaggerated fuel consumption!!

[Ryoko]

Hi, I was wondering why I can only get ~200KM on a full tank..yes I have a CEL(one of my cooling fan? is not working but I know they works because I never had any overheating) but I dont think it has something to do with my problem.

New sparks plugs and new air filter both OEM..beside I had one CEL that says something about my EGR valve not working correctly and apparently it cost alot..anyway but that code never came back I think. I was thinking about O2 sensors as well..my car LGT 98 has 146 000KM only..oh and NO gas leaks. and i'm really easy on the accelerator, never reach more than 3k Rpm..

Can you guys tell me what exactly is the problem that causing this? it really sucks too much gas I mean ~200KM per full..

:evil:

[Airgne]

well when was the last time you changed the plug wires, fuel filter, knock sensor? my 01 GT i got 150miles to a tank of gas, changed the knock sensor and boom baby 400+miles to a tank.

[Ryoko]

thanks for the fast reply,

just bought the car almost a year ago but no I've never changed those you mentioned. i'll changed those when I have time thanks :grin: is there anything else?

[Airgne]

i dont know if your car is a ODB1 od OBD2 sytem. easy way to tell look under and see how many O2 sensors you have. 1 is OBD1 2 is OBD2. i would change O2 senors as well. also wait for more ppl to have inputs, still new to subies.

[99susx2]

WHOA! Unless you have unlimited funds, I wouldn't just start throwing parts at it. O2's and knock sensors are not cheap. They will stop working, but then your ECM will tell you that. If it's a 98, it is probably OBD2.

Plugs and wires are not a bad idea, but they also shouldn't cause that kind of mileage hit, alone.

Have the codes read. It might cost you a little, but not as much as an O2 sensore... Around here (MN) Precision Auto will read them for $20 (us). Check if your local dealer's service debt will do it as a curtesy. Some will, others charge you an arm and a leg!

The codes will pinpoint what the computer thinks is wrong. If it IS and O2, that can cause a mileage drop. The computer can't figure out how to trim the fuel, and it doesn't want to run lean (less fuel. more air), so it errors on the rich side (more fuel, less air).

[Huffer]

The O2 sensors can go bad, slowly, and the factory base maps are so conservative they allow the car to run badly for a LONG time. Too much fuel is just as bad as not enough.

What I would do is reset the ECU/ECM, and begin to buy a couple of O2 sensors because they DO fail eventually. Never hurts to have some around.

Run the car and for goodness sake stop being a nancy with the gas pedal. Bring it up to 5200rpm at LEAST once a week, when it's warm.

You're not even in peak torque territory shifting at 3000rpm, and if you never go over it... I can't imagine the kind of carbon deposits that have built up.

Wouldn't hurt to run some Chevron Techron fuel system cleaner either, or Seafoam.

[deadlydave]

have you run any fuel injector cleaner lately. I try to do that every few months.

[Airgne]

also forgot to say try to seafoam your engine and fuel tank. holy shit does it work. after i did it my car acted like it had a hardon for power and MPG. O2 sensors will run you about 120-180 for one all depends on if its the one before or after the cat. also if it is the plugin type or slice in type.

[Ryoko]

Run the car and for goodness sake stop being a nancy with the gas pedal. Bring it up to 5200rpm at LEAST once a week, when it's warm.

You're not even in peak torque territory shifting at 3000rpm, and if you never go over it... I can't imagine the kind of carbon deposits that have built up.



Shifting? my car is AT :razz: but yeah I hardly rev high for one reason, i'm afraid of blowing my heads gaskets..money is getting rare these days :lol: correct me if i'm wrong being afraid of blowing HG up.. :neutral:

I'm taking note everything you guys wrote and i'll talk to my mechanic and see what happens. thanks everyone :grin:

[Airgne]

one day when you are getting on the freeway just put the pedal to the floor and let the tranny/comp shift the car. all cars that are driven like there is an old lady behind the wheel build up carbon. this is because there isnt enough pressure to break most of it up. yes you could blow up a HG, but you could blow on up just as easy as starting your car. i hope everything works out for you.

[Huffer]

HG's will fail if they're going to fail, they're not dependent on how "hard" you drive the car. If the HG's have been replaced already then you'll be fine.

Just make sure you have an emergency fund in place and you're golden.

Reset the ECU at least.

[AkumaMax]

I just got a 96 L AWD 5spd and I'm not getting that great of mileage (So I think) I'm averaging around 200mpg to the tank. Does this sound right or could I need a tuneup?

[decke48]

yes how do these people on nasioc say there getting 30 to 36mpg?? i would like to know

[AkumaMax]

I just got a 96 L AWD 5spd and I'm not getting that great of mileage (So I think) I'm averaging around 200mpg to the tank. Does this sound right or could I need a tuneup? Well today I was a little happier when I ended up having 260mpg to the tank so it's getting up there just wish it was around the same as my 94 Integra was at around 300mpg to the tank.

[Huffer]

It'll never be as good for MPG as your 'teg - the drivetrain is heavier and the shell is probably heavier too.

[Airgne]

im still getting 360-420 per tank.

[AkumaMax]

im still getting 360-420 per tank.

Is that KM or Miles?

[Airgne]

miles

[AkumaMax]

what size tank is that? Are these highway or city miles?

[Airgne]

16.9 gallon tank. city and highway.

[Ryoko]

Ok the CEL codes are..

P0400 Exhaust Gas Recirculation Flow Malfunction
P0480 Cooling Fan 1 Control Circuit Malfunction

What's the first one? EGR valve?

[Huffer]

yep, EGR. I would try cleaning it first, reset the ECU and then see if it triggers again.

[Monkhouse]

I used to get around 300-350 miles to a tank of gas, now I seem to be luck to get 250.

[AkumaMax]

ah now I understand why u guys are getting 260+mpg to the tank. It's because the 2000+ Legacys have 16 gallon tanks where the 95-99 Legacys have a 12 gallon tank!

[Huffer]

ah now I understand why u guys are getting 260+mpg to the tank. It's because the 2000+ Legacys have 16 gallon tanks where the 95-99 Legacys have a 12 gallon tank!

98 Legacy GT = 15.9 gal
97 Legacy = 15.9 gal

the MPG rating doesn't change dependent on the size of the gas tank - it's MILES per GALLON. 25MPG = 25MPG regardless of tank size.

If you have a bigger tank it's not going to get you better MPG.

[DLC]

I have eeked out almost 475 on one tank, 16 gallons, two years ago. Right under 30MPG with a whole host of modifications. We'll see if I can approach that again with a clean air filter and better fuel with the warmer weather.

[StatGSR]

i should add not to rule out sticking brake calipers, just found out i had one on the integra that has caused atleast a 3-4mpg differance from normal.

[AkumaMax]

i should add not to rule out sticking brake calipers, just found out i had one on the integra that has caused atleast a 3-4mpg differance from normal.

Typical problem with Integras. I still have my 94 RS. Anyway anyone getting 30mpg or around there with the 2.2liter? Also the guys that are getting around 30mpg are you a 4dr or wagon?

[Monkhouse]

Has anyone looked into the hydro units that are sposed to convert water to hydrogen and supplement the gas with it? From what I read it's sposed to double your MPG. The only one I know of is called hydro4000.

I know this sounds like a commercial, but it's not. I'm skeptical of it since the only people that are making these claims are the ones selling the product.

[Ryoko]

yep, EGR. I would try cleaning it first, reset the ECU and then see if it triggers again.

Well it's not the EGR and not the sensors, you know the weird green cap thing near the EGR, I dont know what it is but its connected to the EGR I think and that thing is broken which may be the source of my problem. Other than that, the plugs wires and the coils pack(?) need to be fixed I think.

And I forgot to mention in my first post that the car seem to be hesitating too when I accelerate..probably due to the coils and the wires? :neutral: ... and unfortunately one of my cooling fan isn't working as said on the CEL codes P0480..but its working when I turn on the A/C(which is blowing pretty cold :grin: ) .. can this be an "electrical" problem ?

~ryo

[Airgne]

hmmm. if the code is saying EGR than it is a EGR problem and anything in that system. so maybe it is.


oh yeah.
Blast my desire, stronger than fire jidai wo furuwasete Risky tune (Break what you wanna break)

[Ryoko]

^^ :grin: m.o.v.e is a great band :cool: love the lyrics :cool:

[elliottlj]

how do you clean your egr valve cuz my CEL has been on for a while and it mentions the egr valve and i think knock sensors :(

thats prob why my mpg suck lol

[decke48]

^you can clean it with a good amount of carb clean and a new gasket. theres a tube to the head that can be cleaned too. with a bent up coat hanger. or a flexible pipe cleaner

[Wiscon_Mark]

Typical problem with Integras. I still have my 94 RS. Anyway anyone getting 30mpg or around there with the 2.2liter? Also the guys that are getting around 30mpg are you a 4dr or wagon?

I've had as high as 32mpg with my wagon. What difference would it being a wagon or a sedan make in mileage? That almost sounds like the theory where sedans of the same model are faster and sportier even if they have the same suspension and engine :lol:

30mpg is definitely doable with your EJ22, and a decent figure for it. If you're expecting 37mpg, you're probably not going to get it.

[Airgne]

i think its because ppl think wagons are heavier than sedans.

Fuel economy: city/highway all models
Automatic 22/27
Manual 21/28
regular unleaded, 16.9 U.S. gallon tank capacity

that is for the BE/BH5

2.2 Liter SOHC, 16 valve, 4 cylinder, Multi-port Fuel Injected boxer engine. 137 hp,
economy - 23 city, 30 highway, automatic and manual trans,
15.9 gallon fuel tank

for the BD/BG.

BD/BG GT model

2.5 liter, multi-port sequential fuel injected 4 cylinder, 16 Valve DOHC boxer engine,
165 horsepower, 162 Ft. lbs Torque
economy - manual 21 city - 27 hgwy, automatic trans 21 city - 26 hgwy

[AkumaMax]

yea IDK whats up with my car. Maybe I'll get a tuneup next week. But the best I've got so far is 260 to the tank. Also I have never filled up 15 gallons in my tank I topped it off when I got the 260 and I onlt had about 12 gallons in there.

[AkumaMax]

I have to say that I think atleast for the EJ22 the fuel tank is smaller!? The reason I say that is in my manual it says that I have a 15.9 gallon tank but friday when I filled up I put in $55 and gas was $4.18 a gallon! I filled it up to the neck where it was almost spilling out. Waited to see if it would subside but no so I took a look at the pump and it said I had only put in a little over 13 gallons of gas. I have to also tell you that I had been literally running on the gas light all day long before the fillup! I did however manage to get phenomenal gas milage on the express way at about 70mph. From full to 3 1/4's of a tank(first bar) I got 150 miles. Not bad at all! considering when I first got the car I was getting 260 to the tank maximum!

[Wiscon_Mark]

Don't trust your fuel guage, it's very inaccurate. The tank is not smaller, and I have filled up with 14.7 gallons on it before.

[AkumaMax]

It's a possablity that they rate it at 15.9 but really people only use about 13 gallons(E mark). I know not to trust my gauge after the whole day of driving on E and my car did not even sputter once! all though I'm happy with the fuel milage that I have right now. I'm just on E and have 354miles from a top full tank and this is on mixed driving. I think the reason for me getting such crappy gas milage before is the fact that I was new to AWD and subaru's. Also the last time I drove a stick was last winter! 27mpg is not bad for a mix drive with about 300lbs of work stuff in my trunk. I'm really starting to get into these cars alot.

[03LegacyWgn]

most tanks will have a reserve capacity of a few gallons so that it doesnt die on E so that you can get to a service station.

On my 03 BH9 i get roughly 450km per tank city driving it like a white man and around 300 when im speed racer lol on the high way i got 800km per tank driving it moderatly.

How does one recet the ECU? just disconect the batter for 10 mins or is there a fuse somewhere to pull out?

[Bohemian_Funk]

Don't trust your fuel guage, it's very inaccurate. The tank is not smaller, and I have filled up with 14.7 gallons on it before.

Seriously, extremely inaccurate. Usually mine will hit the peg, and I'll fill it up, and still only put 12 gallons of gas into it. Though I would be willing to bet that if you filled it up all the way, and then ran it until you were completely out of gas, your ECU may have a better time recognizing when your tank is empty or not.

My two beheaded Abraham Lincoln commemorative copper-plated zinc coins.

[96legacyLS]

the most I have put in Mine is 14.5, but another time the needle was on E and it only filled up 11.5. so yeah I guess the guages arent really accurate... I heard your speedo and tach arent correct either, because of interferance with the other guages, just wondering if this is true or not

[Huffer]

With the price of gas, unless you're going on a LONG non-stop road trip, don't even bother filling all the way up. You're just carrying around dead weight, which reduces your efficiency.

During the summer, because I only drive 5miles to work, I never have more than a "1/4" tank in.

[AkumaMax]

yea I do security systems so I drive around a lot. My last tank was a surprising 420MTT(Miles to the tank) my milage came out to be a little over 32mpg. Granted this was mostly highway at 65-70mph with a little 80-100 here and there. This thing gets great gas milage. I think the reason for my getting only 260 to the tank when I got it is because I was getting into a stick car again from being out of one for a year. Also the car is very different for my other acura integras. Oh I also forgot to mention that I had about 200lbs of work supplies+220lb co worker on on trip for 150miles.

[outbacktweaked95]

Has anyone looked into the hydro units that are sposed to convert water to hydrogen and supplement the gas with it? From what I read it's sposed to double your MPG. The only one I know of is called hydro4000.

I know this sounds like a commercial, but it's not. I'm skeptical of it since the only people that are making these claims are the ones selling the product.

Im actually putting one in a 95 outback but my grandpa is dragging his feet on making the storage container but i have made bubbles and im working with some of my engineering friends and a guy for the college that has a PhD in hybrid and alternative fuels ill keep it updated and take as many pics a possible.

[AkumaMax]

A buddy of mine put one on his 96 teg. He gets about 25 more miles to the tank he said. It's not much but anything will do I guess!

[Bohemian_Funk]

25 more miles is quite a bit, actually... Now what I'd like to know is how does it effect your engine's power, and how well it would work in a high-hp, turbocharged engine environment.

[yazmo]

Hello guy i have buy a subaru legacy 1994 turbo awd sedan and since i have it i have a very bad gas milleage at first i was going 320km full tank
now i drop like 150 km full tank.

last week i figure out that i had a leak from the gas tank this surely one of the reason, but i am 95% sure that not only this bcuz there is only few spill on the floor it's not like a huge leaking there. i have order brand new gas tank with all the pipe and the filler pipe with the gasket from subaruparts.com

cost me around 575$ my radiator blew few day ago and as been replace, i have a few minor problem little leak in engine can figure out where exactly but i dont have to replendish my oil every month the leak is too small. sometime my engine make some weirdo sound it's happen tree time already.

when i mean real weirdo sound ,i realy mean it, i tough i had blow something but after reving up the engine over 5000rpm the sound dissaper.

i have also notice a wisshing sound after 2800rmp and around the power light don't come up and i realy dont think it's the turbo sound it's like a leak somewhere maybe i run too rich and this is one of the reason why i have such a bad milleage. still trying to figute it out.

i am french canadian so be easy with me guy i just trying to explain my situation. i have recently change my starter, alternator, coolant temp sensor, i have a brand new o2 sensor not install yet with canshaft sensor and knock sensor not intall either. i will eventualy try seafoam if i get to know where i have to put it in.

i have made minor update
like strut bar front and rear, headlight smoked protector, i have made all the minor tunning like air filter , gas filter oil filter and so on.

so that my story, i have buy this car 4200$ can dollars no rust on it very very clean but i found out it's as been accidented
i feel strumble engine at idle, maybe one of the injector not working properly or wire maybe i have a cylinder problem maybe frame is disform dont know

it is my first car
i have read hayne manual like anyone else here probably.

this is all on credit at first i would have sell it right away but there is too many money spend on it to let it go. better start rebuilding it slowly.
everything else work like a charm my friend tell me work like a brand new car. lol that truth run smoot and strong but with a few problem

hope you guy have some suggestion

thx you in advance everyone

[88rxn/a]

if the knock sensor is bad itll throw a code correct? i talked a co-worker into get a subby wagon and shes only getting 200 miles to a tank. she claims she hasnt seen a engine light yet.

[decke48]

if the knock sensor is bad itll throw a code correct? i talked a co-worker into get a subby wagon and shes only getting 200 miles to a tank. she claims she hasnt seen a engine light yet.
maybe, maybe not. if it stuck the rod wont move to ground the sensor. and no CEL.

[ScaryFatKidGT]

ok im really confused here every one is talking in miles/tank not miles/gallon and theres different sized tanks and some people are talking in km's

I have a 98 BD GT AT 2.5L 180k 15.9 gallon tank it looked like about the same mpg as the 2.2L (like 1-2 less) i have never got more than like 13.5 gallons in it and thats 2 the point were it will stall out if i whip it around a right hand corner to fast(thats how i know i need to fill up haha)

I get about 300miles per tank 320-340 on highway 280 if i drive it hard i installed a lightwight crank pully and pitch stop yet i havent really noticed an increase in mpg i would like to know how people get 400 miles per tank and or 26-30mpg should i try a TB spacer? like STP or something? clean EGR? or just sea foam every thing? and how does the knock sensor effect MPG?