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Thread: My 1.8 petrol sounds like a diesel!

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    Default My 1.8 petrol sounds like a diesel!

    Hi all,

    In the last few weeks my car has developed what can be described as a diesel-type sound when idling. It's especially apparent when I pull up outside my house and the sound reflects off the wall. Could almost be described as a "tapping" sound.

    Anyone have any ideas on what it might be? The car had an oil & filter change approx 5K miles ago.

    Thanks!

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default

    I wonder if it could be timing belt tension....

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    Regular Member dilan's Avatar
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    don't know if it's a 1.8 thing but mine is 1.8 sri serviced last week and only done 27k and it's also quite rattly/tappety........i think it's a trait of this engine tbh

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    depends how tappety...have you taken the oil cap off (carefully) while idleing to see if oil is getting up to the top?

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    Regular Member dilan's Avatar
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    i'll give it a look tomoz, cheers for the advice...is there anything that can be done if it turns out not enough oil getting up there or something

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    my oil burner doesn't tappety tap

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    Regular Member paul wingnut's Avatar
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    Vehicle : vectra sri 150


    Engine : 1900 cdti 150

    Year : 2008

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    if its the z18xer engine fitted in all 1.8 after 2007 i think . they have problems with cam pulleys for variable valve timing also need fully syn oil as well

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    Regular Member 67688c's Avatar
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    Quote Originally Posted by paul wingnut View Post
    if its the z18xer engine fitted in all 1.8 after 2007 i think . they have problems with cam pulleys for variable valve timing also need fully syn oil as well

    The above problem tended to show up mainly when the engine is first started from cold, as the oil needed for the pulley hydraulic tensioners had a habit of draining back when left over night. Modifed oil valves were later fitted to try and effect a cure. This problem was very prominent on the 1.8vvt engine on the new Insigni'a also, until VX introduced some modified one way oil valves 3 months after I complained.
    ----------------

    What may be causing the OP noise is the 'Tank Vent Solenoid' I had one go faulty myself on a 1.8vvt Insignia and they can be really noisy.. like a very loud tapping noise. When mine did it, at its worst...my wife and I thought there was a helicopter hovering right above us it was so bad.

    Even normally the vent solenoid will make a little noise but usually more of a ticking noise, hold your hand on it, and you can physically feel the solenoid vibrating...ie operating the valve inside. Later mods have been introduced by VX to try and insulate the unit with a special rubber mount as most of the noise originally was being caused by the unit resonating through the car bodywork. Certainly worth checking out, and can quickly be eliminated if not faulty.
    Last edited by 67688c; 8th February 2010 at 19:33.

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    Default

    Thanks for the comprehensive reply!

    Is this something that can cause permanent damage / engine damage over time?

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