Fuel Economy

[Mud]

I have always goten poor fuel economy in my R33.

I read recently that it might be the oxygen sensor?

I only get about 300km to a tank. I thought that was just normal.

Does anyone get much better than this?

[Jay95R33]

I always get around 400km to a tank. And that's before the fuel light flashes at me

The last time I drove it 'till the fuel light came on it was about 450km.

Yepp, check your O2 sensor and maybe clean your AFM.

J

[int21h]

I was thinking about posting the exact same question.

My fuel economy is up shit creek. I'm getting 15L/100 OFF BOOST and then 20+L/100 when giving it a bit of stick.

I've recently had a new fuel pump and new timing belt.

What stuff should I check?

Whats there to check with the 02 Sensor?

[Mud]

Oh, I forgot to say, my fuel warning light doesn't come on either?

How can I fix it?

Where is my o2 sensor and AFM?

How do I check them?

I can get about 400Km on the highway only.

[DAMQIK GTS-T]

I was getting really bad Fuel Economy a few months ago (lucky to get 200k to a tank) I replaced my o2 sensor 4 a ford unit all is now good.

Long steady drives i get over 500 k to a tank, arround town strapping it i get at worst 400k's.

I would get you O2 sensor replaced.

The ford unit is the same as the nissan one only cheaper and you need to change the plug to the nissan one 4 it to fit. For under $90 well worth it.

Regards

Damqik

[Mud]

where and how?

[DAMQIK GTS-T]

The o2 sensor is located on the back of the turbo & has 3 wires going to it. I got my replacement one from Barnes high performance Nambor (he can fit 4 u tho I did mine myself)

The Afm is mounted on the back of the air box has about 5 wires going to it, give it a spray with Co Contact cleaner made by CRC

try the following link for more info

http://www.wave.co.nz/~hksnz/techfiles/oxy...orlifespan.html

[poyz]

The O2 sensor is only used by the ECU during closed loop operation. Even with a faulty O2 sensor your fuel economy should only drop a bit.

300km to a tank is a significant drop. I doubt it'll be your O2 sensor. Could be a bad tune, fault spark plugs, a blocked/damaged cat.

[Bleach1]

i get about 350k's to a tank around town while occasionally giving it sum. Highway up around 450k's. not all that great.

[Mud]

Yeah, I'm talking 300km at BEST.

If I give it a bit I'm lucky to get 250.

I spoke to a mechanic about it today.

He's gonna replace it for me under the warranty I got with my car.

Who says those warranties aren't worth shit hey?

We'll see how it goes hey?

[Mud]

Had my O2 changed for another one (not a new one) last week.

Went from about 250kms to 350 or so from a tank, so thats an improvment to me.

[T0nyGTSt]

If your car is modded off its tits AND you run high boost, fuel economy is always going to go south...

T.

[skyline33]

my car is stock and i get around 350/tank

[int21h]

Originally posted by poyz

The O2 sensor is only used by the ECU during closed loop operation. Even with a faulty O2 sensor your fuel economy should only drop a bit.

300km to a tank is a significant drop. I doubt it'll be your O2 sensor. Could be a bad tune, fault spark plugs, a blocked/damaged cat.

I disagree. I changed my O2 sensor, and that has made all the difference. I'm getting waaaaaaay better economy then what i did before.

[aybee]

i picked up my car yesterday, filled it up and drove 40ks to compliance and had already gone through 1/4 tank. now thats bad! plus it wasnt even boosting up properly

[DAMQIK GTS-T]

Originally posted by poyz

The O2 sensor is only used by the ECU during closed loop operation. Even with a faulty O2 sensor your fuel economy should only drop a bit.

300km to a tank is a significant drop. I doubt it'll be your O2 sensor. Could be a bad tune, fault spark plugs, a blocked/damaged cat.

Actually skylines spend most of their time in closed loop the only time there not is @ full throttle or accelerating off.

If the O2 sensor is stuffed the ecu gos into the safe (Rich) limp home mode.

Therefore as many people have said replacing the O2 sensor has given them much better fuel economy if you have a stock or near stock car and get shit economy I'd recommend replacing it.

[SmoothLine]

Id say my car is running a lil rich, but overall i still get about 400+ per tank...