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Thread: Tb48 worsening economy

  1. #1
    Expert Skitzyrex's Avatar
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    Tb48 worsening economy

    Hi All,
    Have owned my 07 GU 4.8 for about 7 years now and the economy has gone from around 21 lph around town to between 26-28lph. Car has now done 210000 kms.
    Now there’s no engine lights coming up to indicate an AFM or O2 sensors are faulty, could they need replacing without engine lights? Also could the valves affect the poor economy?
    Thanks for your input

    Mick
    2007 GU ST-S 4.8 Patrol.
    40mm heavy duty springs, Dual batteries,
    140 ltr fuel tank,Custom 60ltr water tank, draws, cargo barrier, bull bar, IPF spotties, UHF.

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  3. #2
    Expert Skitzyrex's Avatar
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    No one?
    2007 GU ST-S 4.8 Patrol.
    40mm heavy duty springs, Dual batteries,
    140 ltr fuel tank,Custom 60ltr water tank, draws, cargo barrier, bull bar, IPF spotties, UHF.

  4. #3
    Patrol God Avo's Avatar
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    Quote Originally Posted by Skitzyrex View Post
    No one?
    At a guess as no one has commented, injectors

    Sent from my SM-G930F using Tapatalk
    I drive my wife's patrol......and i'm going to Licola...2018

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    Dribble Master Clunk's Avatar
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    Yes Valve clearances can affect fuel consumption, so can dirty MAF sensor and air filter.

    What have you done to it in the last 7 years? Addition of accessories etc


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    Clean your Air Flow Meter with CRC contact cleaner so it doesnt leave a residue.
    Also Replace your oxygen regardless as they start to fall off the operating range with age and wear and tear from the heat.

    One over seen thing is also change your coolant temperature sensor as that can return incorrect readings and make the ecu run the car rich.
    Also replace your thermostat. It could be slightly stuck open and car is running cooler constantly which makes the car drink more fuel too.

  7. #6
    Expert Skitzyrex's Avatar
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    Thanks gents, I’ll work through those things. I’m fairly onto the maf sensor and have cleaner for it so do it frequently.
    Clunk, as for the accessories, if anything I’ve made it lighter.

    Thanks again
    2007 GU ST-S 4.8 Patrol.
    40mm heavy duty springs, Dual batteries,
    140 ltr fuel tank,Custom 60ltr water tank, draws, cargo barrier, bull bar, IPF spotties, UHF.

  8. The Following User Says Thank You to Skitzyrex For This Useful Post:

    Clunk (12th July 2019)

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