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Thread: Hissing noise when engine switched off.....

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    Regular Member s0501291's Avatar
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    Default Hissing noise when engine switched off.....

    Hi All
    I have a 1.8 2003 LS, and was just wondering if there is supposed to be a hissing noise comming from the throttle body/butterfly area when you switch the engine off,, it only lasts for 2 or 3 seconds and ends with a kind of hisss/pop sound....

    Thanks
    pete

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    Regular Member hibbsy18's Avatar
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    hi mate!!

    The noise that you are hearing is the butterfly valve inside your throttle body (TB)! Over the years, all the crap (evaporated oil) from the top of the cams has clogged up the TB.
    All it is, is the pressure of the engine being released. Mine did it from day one that i had the car, I thought it sounded cool! Till i looked and saw how dirty it was!

    You need to remove the black plastic pipe off the top of the engine (the large one that comes from the air box) Take great care with the MAF sensor. Dont get it dirty!
    Then the one smaller one from the cam cover.
    Then there are two small ones behind, remove these too! Be carefull with these, as they are the coolent pipes, be sure that no water drips inside the intake manifold!!
    After that there is a small one on the left near the coolent pipes, remove also.
    Remove the wireing loom from the top.
    After you have got all the black pipes off, you will need to remove the four bolts that surround the TB. It should just lift off now, make sure you pick the gasket up too!
    Clean the butterfly with an old rag using WD40 or Petrol. You will probably need a green scrubing pad too, just a kitchen one. Open up the valve an hold it open an scrub away as much (all of) the black stuff that has built up inside it, make sure you get the edges of the butterfly flap so it doesnt stick like it was before.
    For the smallest pipe that came off the front off the TB, you might need a 2-4mm drill bit just to poke the crap out of it, I did anyway. The two black pipes that come off the top of the engine over will be clogged up too. Take them off an shove a pipe cleaner or your cloth up there to get it all out!
    Once you've done that and its shiney and clean inside and out, refit, ensure you have placed the gasket correctly, tighten it all up with the bolts and refitt the pipes with their weird clips. Again be carefull with all pipes, ie dont cut them or make holes in them by accident, yes i did this and it wasnt good, as ten mins down the road i had no coolent left!

    When your all done, have a quick FOD check. Start your engine check the two coolent hoses for leaks. Your engine respose and all round performance will be restored slightly.

    Next.... a de-cat pipe works wonders with the 1.8! lol

    Hope that helps!

    Rich

    hmmm i must make a how to for this....
    Last edited by n_hudson; 26th April 2009 at 02:11.

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    Regular Member s0501291's Avatar
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    Hi
    Thanks for taking the time to post such a detailed reply, that sounds like a job for weekend!

    Thanks again
    Pete

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    Regular Member hibbsy18's Avatar
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    no worries buddy!! like i said make sure u dont get any oil or anything on the MAF sensor cos i did and i had engine probs! and £30 is better spend on a mod that buyin a new maf sensor! lol

    only took an hour or so! i painted the left side of mine at the same time! looks good red!

    good luck an i hope all goes wel! engine wil be quicker on pick up!!

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