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Fuel Economy

Mud

By Mud,
in Engines & Forced Induction

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int21h Community Regular

int21h

Posted
Posted

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?

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DAMQIK GTS-T Community Regular

DAMQIK GTS-T

Posted
Posted

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

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DAMQIK GTS-T Community Regular

DAMQIK GTS-T

Posted
Posted

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

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poyz Proficient

poyz

Posted
Posted

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.

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Mud Grand Master

Mud

Posted
  • Author
Posted

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?

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  • 3 weeks later...
int21h Community Regular

int21h

Posted
Posted
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.

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DAMQIK GTS-T Community Regular

DAMQIK GTS-T

Posted
Posted
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.

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