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Thread: 1.9 8v 120bhp MPG Help... Its bad...

  1. #1
    Regular Member Vectra Adz's Avatar
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    Vehicle : SXi+

    Trim : GSi Spec

    Engine : 1910

    Year : 2004

    Mileage : 140k +

    confused 1.9 8v 120bhp MPG Help... Its bad...

    Why is my MPG so bad??? I cant understand... 70miles ish to £20 worth or diesel... What am i doing wrong???

    Things ive replaced are....

    Thermostat
    CTS
    Glow plugs
    Water pump & Belt Kit
    Starter motor
    Bottom Pulley

    I have a tunning box on it, but even without that, it was still around 70miles to £20.

    What other problems could it be?? When i boot it i can here like a noise if that makes sense... like a boost leak as such..

    But it passed its emissions/smoke test ok.. and i have no EML on...

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    Have you cleaned out the EGR ?
    what sort of driving do you do ?
    How does the DMF sound ?

  3. #3
    Regular Member Vectra Adz's Avatar
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    I did clean the EGR when i got it, nearly 6months ago....

    Driving... around town etc... but still... surly it should be better then that, my old v6 used to see 80miles to £20. And that was juicy!
    Whats the DMF?? Dual Mass Flywheel??

    If so.. its gotta tiny rattle to it... but nothing major... Would need replacing soon i know, but not at moment! lol Thats if thats what you mean, but why would that matter??

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    im averaging around 45 around town and 65 on the motorway

    do you have an mpg readout on your car ?

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    Full Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

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    If it sounds like a boost leak then get it checked, just because it passed the emission/smoke test means nothing.

    Likely cause of the noise is a split pipe or leaking intercooler
    Lois Griffin: Peter! You're bribing your daughter with a car?
    Peter Griffin: Ah, c'mon, Lois, isn't 'bribe' just another word for 'love'?

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    Regular Member Vectra Adz's Avatar
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    Quote Originally Posted by BMAstra View Post
    im averaging around 45 around town and 65 on the motorway

    do you have an mpg readout on your car ?
    No mate, its only a SXi, i have got one with everything to go in.. but im not 100% on wiring up things lol.

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    if it had a boost leak i would expect it to smoke a bit?

    Also reason i mentioned DMF as it can cause poor economy when warn but only if pretty bad

  8. #8
    Regular Member Vectra Adz's Avatar
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    How do i check other pipes etc though, they all look ok?? And are the intercoolers easy to get of??

    And the DMF really isnt that bad, only a tiny bit if that makes sense lol.

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    Regular Member pogo's Avatar
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    geez oh mate my v6 turbo auto(admittedly driven like a saint) is getting currently about 120 miles out of twenty five quid! could be a combination of many things thats causing it

  10. #10
    Regular Member Vectra Adz's Avatar
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    I need pointing in the right direction tbh, ive also had petrols, and this is gonna make me want to go back to one! lol

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