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Thread: Why does a knackered thermostat................

  1. #1
    Regular Member carperjake's Avatar
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    Vehicle : Signum

    Trim : Elegance CDTi 120

    Engine : 1.9

    Year : 05

    Default Why does a knackered thermostat................

    affect MPG? I've noticed my consumption drop by around 10mpg recently, the thermostat's the thing I was thinking of first as it doesn't move much anymore. Just can't get my head round why the MPG should be so adversely affected.

    Anyone?

  2. #2
    Regular Member Beardy's Avatar
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    Vehicle : Astra

    Trim : Elite

    Engine : 1.7 CDTI

    Year : 2004

    Mileage : 110,000

    Default

    iirc the engine cannot get to its optimum running temp so will either run too hot or cold and engines are designed to run with very tight tolerences.

  3. #3
    Regular Member Beardy's Avatar
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    Vehicle : Astra

    Trim : Elite

    Engine : 1.7 CDTI

    Year : 2004

    Mileage : 110,000

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    basically too hot and components expand and become too tight and if too cold not tight enuf

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    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

    Trim : SRI

    Engine : CDTI 150 (Z19 DTH)

    Year : 2008

    Mileage : 100k

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    Coolant temp effects the fuel mix. Cold engine = more fuel etc. all part of the ecu map.

  5. #5
    Regular Member carperjake's Avatar
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    Vehicle : Signum

    Trim : Elegance CDTi 120

    Engine : 1.9

    Year : 05

    Default

    Cheers.

  6. #6
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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    I notice from your profile you've got an oil burner.

    I'm guessing the garages are now selling winter diesel.

    That'll make a difference to the fuel consumption.

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    Vehicle : vectra v6 cdti

    Trim : sri


    Year : 2005

    Mileage : 70000

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    10 mpg is a massive drop,noticed about 3-4 mpg loss when mine packed in

  8. #8
    Regular Member Exclusive BV's Avatar
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    Default

    i think the reason is due to the programming in the ecu.

    it is set to deliver a certain amount of fuel until the car gets to a certain temp

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