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Thread: knocking and rattling noise under bonnet

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    confused knocking and rattling noise under bonnet

    hi can anyone help i have a 03 vectra 1.8ls and just recently whilst on a trip a wierd rattling noise started coming from under the bonnet when i got to about 30mph. the faster i go the louder it gets, the engine is sweet as a nut and only done 40,000 iknow its not engine noise for definate, cheers tosh

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    Regular Member kpf1grandprix's Avatar
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    Quote Originally Posted by TOSH View Post
    hi can anyone help i have a 03 vectra 1.8ls and just recently whilst on a trip a wierd rattling noise started coming from under the bonnet when i got to about 30mph. the faster i go the louder it gets, the engine is sweet as a nut and only done 40,000 iknow its not engine noise for definate, cheers tosh

    water pump??

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    Regular Member aos's Avatar
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    My '03 1.8 had rattle last year which I thought was timing belt/tensioner, but turned out to be water pump. Rattle comes from timing belt area for both. I'm not an expert, but I would start there. I had timing belt done too, as there is some debate over the proper milage for changing. I thought it was 60k, many think it is 40k, my car was done at 50k. I will go for 40k next time, to be safe. Hope this helps.

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    Regular Member BlueRob's Avatar
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    As above...waterpump or something with the aircon maybe

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    Or it could be the oil pump as thats in the same area.

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    Firstly, is it engine speed or vehicle speed dependent?

    If it vehicle speed, then it's unlikely to be water pump. If it's engine speed, is it load dependent too? You will need to do some investigation.

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    Regular Member glenboy's Avatar
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    Sounds like the belt tensioner to me

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    hi there i dnt think its the water pump as the noise is comming almost from the centerof the car but more to the passenger side under bonnetits also a bit of a squeeky rattle, any other suggestions

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    exhaust mounting

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