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Thread: 1.8 sxi low mpg

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    Default 1.8 sxi low mpg

    I'm fed up with my veccy, currently get 25ish mpg knocking about town. i read on here of people getting mid 30's, so what is up wit mine? i have done the airbox mod and did all filters a few months ago. my m8 told me to do an 'ecu reset' so took battery leads off for about an hour. He reckons he did a sensor reset through his computer and also fit an induction kit. he now gets 34 mpg. i cannot do this as i don't have trip computer. can any resets be done through op-com? would i be better with a k&n panel filter? i'm only getting 300 miles to a 60litre tank and its doing my head in! Would really appreciate your help guys!

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    Full Member Niall83's Avatar
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    Have you got a heavy foot? I'm getting 34mpg on a 1.8vvt with a boot full of crap and 430miles from a full tank. I do drive until nearly empty as when I fill up it takes 60ltrs to do so. I've noticed it helps staying in 3rd around the city which helps keeping to the 30mph speed limit.
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    Lol no heavy foot m8. Am stumped by it. I put a thermostat housing inc temp sensor on it. Noticed that when i'm driving the guage sits right at the bottom it does rise when stationery but drops again when driving. Is this normal

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    Regular Member john_k_sri's Avatar
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    25mpg is about right for town driving in a pre-VVT 1.8, and roughly in line with official figures.

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    Quote Originally Posted by steveyd83 View Post
    I'm fed up with my veccy, currently get 25ish mpg knocking about town. i read on here of people getting mid 30's, so what is up wit mine? i have done the airbox mod and did all filters a few months ago. my m8 told me to do an 'ecu reset' so took battery leads off for about an hour. He reckons he did a sensor reset through his computer and also fit an induction kit. he now gets 34 mpg. i cannot do this as i don't have trip computer. can any resets be done through op-com? would i be better with a k&n panel filter? i'm only getting 300 miles to a 60litre tank and its doing my head in! Would really appreciate your help guys!
    you should have got a 1.9 cdti..... I got 73.9mpg on 56 mile journey and get 50mpg in town check this link
    http://www.vectra-c.com/forum/showpo...5&postcount=62

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    NO, temperature should sit at 85/90 in most conditions, or with the needle vertical, this is done so that you can see at glance if the temp is correct. Was the thermostate a 92 rating, printed on the bottom flange?

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    Quote Originally Posted by carpet View Post
    NO, temperature should sit at 85/90 in most conditions, or with the needle vertical, this is done so that you can see at glance if the temp is correct. Was the thermostate a 92 rating, printed on the bottom flange?



    With aircon running, temp should sit at 85 quite consistently.

    Not running, 85/90. Idling in hot weather should see it go up to 92, fan cuts in then brings it back down to approx 85.

    On the overrun, down a long hill with no throttle, it can drop back to 81/80 depending on length of the overrun and ambient temperature.


    This is applicable to 1.8 NON VVT (Z18XE), but different examples of the same car may vary.

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    So I could be looking at a fault with running temperature then. If its not thermostat or temp sensor. Then wdat else could it be? Ecu fault?

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    Would plugging in op com tell me anything? I.e are there any parameters i can monitor for theair flow metre etc

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    Are you positive that the thermostate is the correct one as your problem does seems to point to a thermostate fault ie; stuck open? As they are easy to remove it might be worth a check to rule it out.

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