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Do injectors make a noise?

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by CCCMikey, Feb 3, 2019.

Do injectors make an audible noise?

  1. Yes

    100.0%
  2. No

    0 vote(s)
    0.0%
  3. Dunno

    0 vote(s)
    0.0%
  1. CCCMikey

    CCCMikey Active Member

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    I've noticed for a few years that there's a sort of knuckly knocking sound from my car when idling. Nothing particularly loud, but I put it down to ageing and cold weather.

    Since repairing the LPG injection system after almost a years' down time, I've noticed that the sound disappears completely when on LPG, and is immediately there again when I switch it back to petrol. Does that mean injectors make a noise? Or is there some subtle difference between how the two fuels burn?
     
  2. VS 5.0

    VS 5.0 Well-Known Member

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    Yes they do, but not a knuckly knocking sound in my experience.
     
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  3. wildfiremaint

    wildfiremaint Active Member

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    More a faint tickatickatick
    sound :)
    It would be reasonable to assume
    that when you switch to LPG and the the sound stops that it was the injectors being the cause.
    Cheers.
     
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  4. CCCMikey

    CCCMikey Active Member

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    Righto - just an old car mystery then! I'll try to record it one day.

    Thanks for your replies.
     
  5. gohrdrgomad

    gohrdrgomad Active Member

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    lnjecters can become loud in my experience when dirty. A tuned spitting noise is made on operation and if you turn the ignition on you should hear them spit a few times to prime the combustion chambers, not like a tap as the lifters make when priming. Knuckling knocking at idle sounds like a lifter discription to me and could be oil related and rectified depending on some factors. Regular oil changes 5-7000 with a correct/quality oil will assist.
     

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